8. DISCOPYOE. 453 



4. Narcine iDrasiliensis. 



Raja, sp., Grunov. Zoophyl. no. 358, tab. 9. lig. 8. 



? 1 orpedo ocellata, Qaoy Sf Gaim. Voy. Uran. Puists. p. 199. 



Torpedo brasiliensis, Olfers, Torjied. p. 19, tab. 2. fig. 4. 



bancroftii, Griffith, An. Kinyd. x. (1834) p. (549, pi. 34. 



Narcine brasiliensis, He)de, Narcin. p. 31, tab. 1. iigs. 1 & 2 ; MiiU. Sf 



Henle, p. 129 ; Dumeril, Reo. Zoul, 1852, p. 272, and Elasmoor. 



p. 514 ; Kner, Novara, Finch, p. 418. 



nigra,, Dumeril, II. cc. 



Toi-pedo pictus, Gronov. Syst. ed. Gray, p. 13. 



Outline of the disk elliptical. Spiracle immediately behind the 

 eye, surrounded by a ring of small tubercles. The first dorsal not 

 larger than the second ; hinder margin of the caudal subtruncate. 



Atlantic coasts of Tropical America, entering fresh-waters ; Cape 

 of Good Hope. 



a-h. Adult (21 inches long) : stuffed. 



c. Young. Para. 



d. Young. Caribbean Sea. From the Collection of the Zoological 



Society. 

 e-f. Adult. Cuba. From the Collection of the Zoological Society. 

 y-i. Adult and half-grown : skins. Jamaica. Furchased of Mr. 



Parnell, 



7. HYPNOS. 

 Hypnos, Duin^ril, Hev. Zool. 1852, p. 277, 



Tail extremely small and short, like an appendage. Body entirely 

 naked. Two dorsal fins on the tail, without spine ; caudal well 

 developed. Nostrils round, open, without valves. Teeth tricuspid, 

 with very slender points. Spiracles immediately behind the eyes. 

 An electric apparatus on each side of the head. 



Australian seas. 



1. Hypnos subnigrum. 

 Dmneril, I. c. p. 279, pi. 12, and Elasmohr. p. 520. 



Eyes minute ; spiracles fringed. Upper parts black, with or with- 

 out white spots. 

 Australian seas. 



a-b. West Australia. "Purchased of Mr. Bowerbauk. 



8. DISCOPYGE. 

 Discopyge, Tschvdi, Faun. Periian. Pise. p. 32. 

 Tail very distinct from the circular disk, with a fold on each side. 

 Body entirely naked. Two dorsal fins on the tail, without spine ; 

 caudal well developed ; ventral fins united. Nasal valves confluent 

 into a quadrangular valve. Teeth flat, with the hinder edge angu- 

 larly produced. Spiracles at a very short distance behind the eyes. 

 An electric apparat us between the head and pectoral fins. 

 Coast of Peru. 



