25 



26. (1.) Trisenodon obtusus*. (Fig. 6.) 

 Trisenodon obtusus, Day, Fish. India, p. 720, pi. clxxxix, fig. 3. 



Snout short and rounded, the distance between the mouth 

 and the end of the snout about half the width of the mouth. Nos- 

 trils nearer end of snout than the mouth, each with a flap. Eye 

 of moderate size. Gill-openings rather wider than the orbit. No 

 spiracle. Teeth with one central and a small lateral cusp on each 

 side. Fins the first dorsal commences behind the inner angle of 



Fig. 6. Triesnodon obtusus. 



the pectoral and the base does not extend to above the ventral. 

 Second dorsal not quite half as large as the first and situated above 

 the anal. Pectoral reaches to below the middle of the first dorsal ; 

 caudal fin nearly | of the total length. Colour dark above, 

 becoming lighter beneath. 



Hob. A young male, nineteen inches in length, was obtained at 

 Kurrachee. 



Family II. LAMNID^. 



Spiracles, if present, minute. No nictitating membrane. Mouth 

 inferior and crescentic. Nostrils not communicating with the 

 mouth. First dorsal spineless, and placed opposite the interspace 

 between the pectoral and ventral fins ; an anal fin present. 



Synopsis of Indian Genera. 



A keel along the side of the tail .................. 1. LAMNA. 



No keel along the side of the tail. Caudal fin less than 



one third total length ........................ 2. ODONTASPIS. 



No keel. Caudal fin nearly one half total length .... 3. ALOPIAS.] 



* Tri<enodonobesus (Carcharias), Euppell, N.W. Fische, p. f>4, pi. xviii, f. 2. 

 Snout very short and obtuse. Nostrils with a short tentacle. Fins first dorsal 

 close to the root of the ventral ; the second upwards of half the size of the first and 

 opposite the annl. Summits of dorsal and caudal fins white. Hub. Eed S<M : 

 east coast of Africa ; New Hebrides ; and probably off India. 



