in the Fish Gallery of the Indian Museum. 81 



seas. Carcharias gangeticus is the Shark that comes up 

 the Hooghly in the hot weather and attacks bathers at 

 the Calcutta ghats. Zygoma is the Hammerhead Shark, 

 of which two of the Indian species are also found in the 

 Atlantic and Mediterranean. An unborn young of 

 Zygoma blochii, with the placenta and curious placental 

 cord attached, is shown in Case 12. 



Family II. Lamnidce. 



These are also large and formidable Sharks, found in 

 all seas. There is no nictitating membrane to the eye : 

 the first dorsal fin stands above the space between the 

 pectoral and ventral fins. Lamna spallanzanii and 

 Alopecias vulpes are found in the Atlantic and Mediter- 

 ranean as well as in Indian seas. 



Family III. Rhiiiodontldce, 



This family contains a single species, Rhinodon typicus, 

 found only in the Indian Ocean, and growing to a 

 gigantic size — seventy feet, it is said. The snout is 

 broad, short and flat, and the mouth is singularly situa- 

 ted at the end of it. Its teeth are very small and it is 

 harmless. 



Family IV. 'Notidanidce. 



A small family containing the single genus Notidanus, 

 with four species, three of which belong to the Mediter- 

 ranean and Atlantic, while the fourth, Notidanus indicus, 

 is found in the Indian and Pacific Oceans. This Indian 

 shark can be recognized by its gill-openings, which are 

 seven in number, instead of the usual five, and by the 

 single dorsal fin. Notidanus is said to reach a length of 

 about fifteen feet. 

 ii 



