CARCTTARIID^E. 21 



20. (2.) Galeocerdo tigrinus. 



Galeocerdo tigrinus, MiilL Henle, Plagios. p. 50, t. xxiii ; Day, 

 Fish. India, p. 718 (see synon.). 



Length of the preoral portion of the snout equal to one half the 

 width of the mouth and slightly less than the distance between the 

 inner angles of the nostrils. A long labial fold along the edge of 

 the upper jaw. Teeth in lower jaw not so large as those in the 

 upper, denticulated in both jaws, and the deuticulations at the base 

 of each cusp also serrated, more especially in the lower jaw. 

 Fins the first dorsal commences above the angle of the pectoral ; 

 second dorsal arises slightly in advance of the anal. Length of 

 caudal contained 3 to 3| times in the total length, and consider- 

 ably (one third) exceeding the length of the interspace between 

 the two dorsal fins. Colour grey superiorly, becoming slightly 

 lighter on the sides and beneath ; numerous brown or dark grey 

 spots over the body. 



Jfal>. Eed Sea, seas of India to Japan, and beyond. 



Second group. ZYG-JENINA. 



4. Genus ZYGJENA, Cuvier. 



Syn. Cestracion, Klein ; Cestrorhinvs, Blainv. ; Sphyrna (Raf.), Miill. 

 & Ilenle ; Eusphyrna and Reniceps, Gill. 



Combun sorrah. Tarn. 



The anterior portion of the head is broad, flattened, and laterally 

 elongated, with the eyes situated at its lateral extremities and the 

 nostrils at its fore border. A nictitating membrane present. 

 Spiracles absent. Mouth crescentic. Teeth similar in both jaws, 

 oblique and notched. The first dorsal fin spineless, situated above 

 the interspace between the pectoral and the ventral ; caudal with 

 one notch, and a pit at the commencement of the fin. 



This genus of sharks is reputed to be very dangerous in some 

 localities. The young are captured along the shores of India and 

 Burma in large numbers. 



Synopsis of Indian Species. 



\ . \ groove along front edge of head. 



Kuril lateral expansion of the side of the 



head two or three times as long as broad 1. Z. blochii, p. 22. 

 The length of the hind edge of each 



lateral expansion of the head nearly or 



quite equal to its width near the eye. ... 2. Z. malleus, p. 22. 

 Anterior edge of head curved but not 



continuous with the lateral one ; the 



length of the hind edge of each lateral ex- 

 pansion is less than its width near the eyes 3. Z. hides, p. 23. 

 B. No groove along front edge of bead. 

 Anterior edge of head nearly straight; 



length of hind edge of lateral expansion 



exceeds width 4. Z. mokarran, p. 23, 



