42 



PISCES 



CLASS I 



Cyclobatis, Egerton. Disk circular or oval, and tail very short, without 

 median fins. Eays of paired fins few and well-spaced, the pectorals united in 

 front of the head. Pelvic arch with very large pre-pubic processes. C. oligo- 

 dactylies, Egerton, from Upper Cretaceous, Hakel and Hajoula, Mount Lebanon. 



Raja, Cuv. (Actinobatis, Ag.), (Fig. 2). Upper Cretaceous (Mount Lebanon) 

 to Recent. Dermal tubercles of existing II. clavata, Linn., in Pliocene Crags 

 of Xorfolk and Suffolk. 



Family 10. Torpedinidae. Miiller and Henle. Torpedoes. 



Traul: much depressed, forming a broad and rounded dish with the pectoral fins, 

 which do not extend forwards to the broadly rounded anterior end of the head. Tad 

 six ni and fleshy, with well -developed dorsal and caudal fins. Skin naked. An 

 electric organ between the pectoral fins and the head. Eocene to Recent. 



Torpedo, Dumeril (Narcobatis, Blv.). Sometimes supposed to be represented 

 by skeletons in Upper Eocene of Monte Bolca, but doubtful. Recent. 

 Narcine, Henle. Upper Eocene of Monte Bolca, and Recent. 



A 



Family 1 1 . Trygonidae. Miiller and Henle. Sting-rays. 



Trunk much depressed, forming a disk with the very broad pectoral fins, which 



meet In front of the snout, and constitute the anterior border of the head. Tail very 

 slender, sharply separated front tin disk, the dorsal fins usually replaced by several 

 stout imbricating spines of vasodentine, which are antero-posteriorly compressed and 

 armed with a row of recurred hooklets on each lateral border. Teeth small, rhombic 

 or polygonal, with bifurcated root, and forming a close pavement. Skin naked, with 

 large conical plates of vasodentine, sometimes fused into groups, usually raised into a 

 short spine. Tertiary and Recent. 



Trygon, Adanson (Trygonobatus, Blv. ; Alexandrinum, Molin), (Figs. 83, 84). 

 Tail elongated, with long, flattened dorsal spines. Dermal plates of very 



variable form and size. T. gazolae, Ag. ; T. 



{Alexandrinum) molini, Zigno ; T. zignoi, Molin, 



known by nearly complete skeletons from the 



Upper Eocene of Monte 



Bolca. Isolated dermal 



plates (Fig. 84) have 



been described as refer- 

 able to Raja, Acipenser, 



Dynatobatis, Larrazet, 



and Acanthobatis, Larr. 

 Taeniura, Uroloph us, 

 M. and H. Upper Eocene (Monte Bolca) and 

 Recent. 



XiphoirygoD, Cope (Heliobatis, Marsh). Resembling 

 Trygon, but teeth cuspidate. X. acutidens, Cope, known 

 by complete skeletons from Eocene Green River Shales *» b f cie \ ™\ siz ^ 



» -, TT x . (Molasse); Baltnngi 



oi Wyoming. 



Oacobatis, Leidv. Dermal tubercles. Pliocene ; Idaho 



in- 



Fig. S3. 



Trygon rugosus, Probst. Tooth 

 terior (A), posterior (B), and lateral (C), 

 aspects, enlarged, and the same nat. size 

 (D). Miocene (Molasse) ; Baltringen (after 

 Probst.). 



Fig. 84. 



Trygon (Acanthobatis) tuber- 

 ulosus, Probst, sp. Dermal 



Miocene 

 gen. 



