37. isisTirs. 429 



a. Stuifed, 8 feet long. Polpcno. 



b. Stufted, 5 feet long. Mediterranean. Purchased of Mr. Wright. 



c. Jaws of an adult example. 



37. ISISTIUS. 



Sej-mnus, sp., Ciiv. Rvqne An. 



Isikius. Gill, Pror. Ac. Nat. So. riiilnd. 1804, p. 204. 



Leius, Kiier, Dcnhschr. Ak. Wiss. Wien, 18G5, ,\xiv. p. 9. 



Two very small dorsal fins, without spino, the first nearly opposite 

 to the ventrals ; no anal fin. Skin unifornih- granular. Mouth 

 transverse ; a deep straight groove at each angle of the mouth, the 

 fold which covers it runs round the whole margin of the upper jaw ; 

 an u])per and lower free lip besides. Nostrils nearly in front of the 

 snout. Upper teeth small, narrow, lanceolate, the lower much larger, 

 triangular, nearly erect, with smooth edges. ]S'o membrana nicti- 

 tans. Spiracles wide, on the side of the neck. Gill-openings very 

 narrow, in a groove. 



Trojiical seas. 



1 . Isistius brasiliensis. 



Scyninus brasiliensis, Quo;/ S,- Gaim. Voij. Uran. Zool. p. 198 ; Midi. 

 S)- Hoih', p. 92 ; Diimeril, Elasmohr. p. 453. 



Squalus fulgens, Bennett, Whaling J'oi/. ii. p. 2r)o ; G. Dennett, Ga- 

 therings of a Natitr. in Austral, p. (>(). 



Leius ferox, Kner, I. c. p. 10, taf. 4. fig. 2. 



Twenty-five teeth in the lower jaw. Scales minute, gi-anular. 

 The first dorsal immediately in front of the ventrals. Sometimes a 

 broad dark band across the chest. 



Tropical seas. 

 rt. Ten inches long. South Pacific. Presented by Commander 



Knocker. 

 h-c. Six inches long. Gulf of Guinea. From Tuckey's Congo 



Expedition. — One of these speciiuens still bears the mark of 



the umbilical cord ; therefore this species must attain to a much 



more considerable size. 

 il. Young : stuff'ed. 



