350 MR. C. TATE REGAN ON SHARKS [Apr. 28, 



2, GiNGLYMOSTOMA. 



Gingli/onostoma Miill. & Henle, Arch. f. Naturgesch. 1837, i. 

 p. 395, and Plagiost. p. 22 (1841); Glinth. Cat. Fish. viii. p. 407 

 (1870). 



Nebrius Eiipp. Neue Wirbelth., Fische, p. 62 (1840). 



Head broad, obtuse ; body elongate, subcylindrical. Mouth 

 transverse, near the end of the snout ; teeth small, tricuspid or 

 multicuspid ; lower lip not divided by a symphysial groove. 

 Nasal valves separate, each with a cirrus. Eye small ; no longi- 

 tudinal fold below the eye. Spiracle very small, behind the eye. 

 Gill-openings of moderate width ; last two close together ; last 

 two or three above the base of the pectoral. First dorsal above 

 or partly behind the pelvics ; second dorsal above or partly in 

 advance of the anal, which is free from the caudal. Caudal of 

 moderate length ; axis directed upwards ; lower lobe notched 

 posteriorly. 



Four species. 



Synopsis of the Species. 



I. Each dorsal and anal fin with the anterior angle broadly 



rounded ; lower caudal lobe not produced anteriorly ; 



teeth tricuspid or pentacuspid, the middle cusp the 



strongest. 



Origin of first dorsal opposite to that of the pelvics ... 1. cirratum. 



Origin of first dorsal slightly in advance of posterior 



end of base of pelvics 2. hrevicaudatum. 



II. Each dorsal and anal fin with the anterior angle 

 pointed ; lower caudal lobe somewhat produced 

 anteriorly. 

 Teeth with a strong median cusp and 3 or 4 small 



cusps on each side 3. ferrugineum. 



Teetli with the cusps graduated to the strongest, which 



is not median 4. concolor. 



1. GiNGLYMOSTOMA CIRRATUM. 



Squcdus ci7-ratus Gmelin, Linn. Syst. Nat. p. 1492 (1788) ^ 

 Schneid. Bloch's Syst. Ichth. p. 128 (1801). 



Squakcs punctatus Schneid. t. c. p. 134. 



Squcdus punct^datus Schneid. t. c. p. 549. 



Squcdus cirgus Bancroft, Zool. Journ. v. 1834, p. 82. 



Ginglymostoma cirrcotuvi Miill. & Henle, Plagiost. p. 13 (1841) ; 

 Dumeril, Elasmobr. p. 334 (1865); Glinth. Cat. Fish. viii. p. 408 

 (1870); Jord. & Everm. Bull. TJ.S. Nat. Mus. xlvii. 1896, p. 26, 

 and 1900, pi. iv. fig. 13. 



Ginglymostoma fulvum Poey, Mem. ii. p. 342 (1861), 



Ginglymostoma caboverdianus Capello, Jorn. Sci. Phys. Lisbon, 

 1867, p. 167. 



Nasal cirrus extending to or beyond the oral edge of the nasal 

 valve. Lower labial folds separated by a considerable interspace. 

 Teeth bicuspid or pentacuspid, the middle cusp much the strongest.. 

 First dorsal a little larger than the second and considerably larger 



