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Albuquerque, R. M. 1954-1956. Peixes de Portugal e ilhas adjacentes. Chavas para a sua determinação. Port. Acta biol., ser. B,5:xvi+1167 p., 445 fig.

Bini, G. 1967-72. Atlante dei pesci delle Coste italiane. Mondo Sommerso, Milano, 9 vol: I, 1967, Leptocardi, Ciclostomi, Selaci, 206 p., 66 fig+64 col. fig. II, 1971, Osteitti (Acipenseriformi, Clupeiformi, Mictofiformi, Anguilliformi), 300 p., 73 col. fig. III, 1970, Notacantiformi . . . Zeiformi, 229 p., 34 fig+63 col. fig. IV, 1968, Perciformi (Mugiloidei, Percoidei), 163 p., 34 fig+49 col. fig. V, 1968, Perciformi (Percoidei), 175 p., 22 fig.+56 col. fig. VI, 1968, Perciformi (Trichiuroidei . . . Blennioidei), 177 p., 48 fig+57 col. fig. VII,1969, Perciformi (Ofidioidei . . . Dactilopteroidei), 196 p., 57 fig.+59 col. fig. VIII,1968, Pleuronettiformi, Echeniformi, Gobioesociformi, Tetraodontiformi, Lofiformi, 164 p., 34+63 fig. IX, 1972, Introduzione. Parte generale. Aggiornamenti. Indici. 176 p.

Bonaparte, C. L. 1832-41, Iconografia della Fauna italica per le quattro classi degli Animali Vertebrati, tomo III, Pesci, Roma, without pagination, 75 puntate (in 30 fasc.), 78 pl.

Carus, J. V. 1893. Vertebrata. 1. class. Pisces: 498-711, In: Prodromus faunae Mediterraneae sive Descriptio Animalium Maris Mediterranei incolarum quam comparata silva rerum quatenus innotuit adiectis locis et nominibus vulgaribus. . . Stuttgart, 1899-93, 2: ix+854 p.

Clark, R. S.1926. Rays and Skates, a revision of the european species. Fisheries, Scotland, Scient. Invest., (1) :1-66, fig. 1-42, pl. 1-36.

Clark, R. S.1929-32. Selachii, Raiidae. In: L. Joubin, ed., Faune ichthyol. Atl. N., CIEM, Copenhagen: fiches 34bis-57.

Couch, J. 1838. Description of a species of Ray-fish not hitherto included in the British Fauna. Ann. Mag. nat. Hist. (n.s.), 2: 71-73, 1 fig.

Day, F. 1880-84. The Fishes of Great Britain and Ireland. London-Edinburgh, 2 vol., cxii+336 p., 5+7 fig., 92 pl. and 388 p., 87 pl. 1880:1(1):1-64, pl. I-XXVII; 1881: 1(2) (3): 65-240, pl. XXVIII-LXVIII; 1882: 1(4): 241-336, pl. LXIX-XCII; 2 (5) :1-96, pl. XCIII-CXVI; 1883: 2 (6): 97-176, pl. CXVII-CXXXII; 2 (7) :177-272, pl. CXXXIII-CXLVIII; 1884: 2 (8): 273-368, pl. CXLIX-CLXXIX.

Dieuzeide, R.; Novella, M. (collab. J. Roland), 1953-55. Catalogue des Poissons des Côtes algériennes. Bull. Stn Aquic. Pêch. Castiglione, I (n.s.), (4), 1952 [1953]: 1-135, 73 fig. n. num.; II (n.s.), (5), 1953 [1954] :1-258, 135 fig. n. num.; III (n.s.), (6), 1954 [1955] :1-384, 202 fig. n. num.

Döderlein, P.1879-91. Manuale Ittiologico del Mediterraneo ossia senossi metodica delle varie specie di pesci riscontrate sin qui nel Mediterraneo ed in particolare nei mari di Sicilia. Palermo, 1879-91 (on title: '1879-80') 5 parts: I, 1879: viii+67 p.; II, 1881:1-120; III, 1884 :121-258; IV, 1889 :1-188; V, 1891:189-320.

Duméril, A. H. A.1865. Histoire naturelle des poissons ou ichthyologie générale, Paris, 2 vol., 1: 720 p., Atlas: 14 pl.

Ehrenbaum, E. 1936. Naturgeschichte und wirtschaftliche Bedeutung der Seefische Nordeuropas, in Handbuch der Seefischerei N. Eur., 2: x+337 p., 276 fig., 2 tabl., 26 pl.

Günther, A.1870. Catalogue of the fishes in the British Museum. 8. Catalogue of the Physostomi containing the families Gymnotidae, Symbranchidae, Muraenidae, Pegasidae and of the Lophobranchii, Plectognathi, Dipnoi, Ganoidei, Chondropterygii, Cyclostomata, Leptocardii in the collection of the British Museum. London, xxv+549 p.

Jenkins, J. T. 1925. The fishes of the British Isles both fresh water and salt. London: vii+ 376 p., 143 pl.

Leigh-Sharpe, W. H. 1924. The comparative morphology of the secondary sexual characters of elasmobranch fishes. The claspers, clasper siphons, and claspr glands. VII. J. Morph., 39 (2): 567-577, fig. 1-15.

Lozano y Rey, L.1928. Fauna Ibérica. Pesces (Generalidades, Ciclóstomos y Elasmobranquios). Mus. Nac. Ciencias Nat., Madrid, 1:1-692,197 fig., 20 pl.

Malm, A. W. 1877. Göteborg och Bohusläns fauna. Ryggradsdjuren. Göteborg, 674 p., 9 pl.

Moreau, E.1881-91. Histoire naturelle des poissons de la France, Paris, I, 1881: I-VII+ 1-480, fig. 1-82; II, 1881:1-572, fig. 83-145; III, 1881:1-697, fig. 146-220; Suppl., 1891: 1-144, fig. 221-227.

Poll, M.1947. Poissons marins in Faune de Belgique. Bruxelles, 452 p., 267 fig., 2 pl., 2 maps n. num. (inset).

Soljan, T. 1963. Fishes of the Adriatic (Ribe Jadrana). Fauna et flora adriatica 1 (revised and enlarged for the English edition), 428 p., many unnumbered fig.

Stehmann, M. 1970. Vergleichend morphologische und anatomische Untersuchungen zur Neuordnung der Systematik der nordostatlantischen Rajidae (Chondrichthyes, Batoidei). Arch. FischWiss., 21(2): 73-163,1 fig., pl. 1-27.

Tortonese, E. 1956b. Leptocardia, Ciclostomata, Selachii. Fauna Ital., 2: 334 p., 163 fig.

Wheeler, A. 1969. The Fishes of the British Isles and North-West Europe. Macmillan, London, Melbourne and Toronto: i-xvii+1-163, 5+177 fig., +392 fig. (princ. sp.)+92 n. num. fig., 16 pl., maps.

Williamson, H. C. 1913. On the eggs of certain skates (Raia). Scient. Invest. Fishery Bd Scotl., 1912 [1913], (1): 1-6, pl. 1-5.

Sandy ray (Raja circularis)