BHIXODONTID.E. NOTIDANID.E. 29 



Family III. EHINODONTID^. 



Spiracles minute. No nictitating membrane. Gill-openings 

 wide. Two spineless dorsal fins, the origin of the first opposite 

 to the ventral or somewhat in advance of it ; the second small, 

 placed nearly opposite the anal ; lower caudal lobe well developed. 

 A keel along the side of the tail. A pit at the root of the caudal 

 fin. 



1. Genus RHINODON, Smith. 



Definition as in family. Mouth and nostrils near the extremity 

 of the snout. Teeth small and conical. Grill-rakers similar to 

 those of the Basking Shark of northern seas. 



Geographical Distribution. Ceylon, Seychelles to the Cape of 

 Good Hope. This shark has been said to exceed fifty feet in 

 length, and some authors even assert seventy. It is a harmless 

 form. 



30. (1.) EMnodon typicus. 



Rhinodon typicus, Smith, Illust. Zool. South Africa, Pisces, pl.xxvi; 

 Day, Fish. India, Supplement, p. 811 (see synon.) > 



Snout broad, flat and short. Eyes small. Upper jaw with a 

 long labial fold. Colour brown, with white dots and narrow 

 transverse lines. 



Hah. One example recorded by Haly from the west coast of 

 Ceylon. 



Family IV. NOTIDANID^. 



.Spiracles small and on the side of the neck. No nictitating 

 membrane. Gill-openings six or seven. A single spineless dorsal 

 fin placed nearly opposite to the anal; lower caudal lobe present. 

 No pit at the root of the caudal fin. 



1. Genus NOTIDANUS, Cuvier. 



Syn. Hcxanckus and Heptanchus, Rafin. ; Mtmaptprktmu, pt., Blainv. 



Spiracles small and on the side of the neck. No nictitating 

 membrane. Mouth crescentic. No labial fold. Gill-openings 

 six or seven, and wide. Teeth in the upper jaw consisting of one 

 or two pairs that are awl-shaped, followed by six broader ones, 

 which have one strong and several smaller casps. In the lower 

 jaw six large comb-like teeth on each side, and some smaller lateral 

 ones. A single, spineless dorsal fin placed opposite the anal ; 

 lower caudal lobe present. No pit at the root of the caudal fin. 



Geographical Distribution. Seas of tropical and temperate regions. 



