197 



ii. 



Key to the Indian species of Congromurasna. 



The length of the head measured to the gill-opening, is less than the 

 distance between the gill-opening and the vent : — 



1. The head is at least three eye-lengths less than the distance bet- 

 ween the gill-opening and the vent : — 



i. The band of vomerine teeth is of good length... ... C. anago. 



ii. The band of vomerine teeth is extremely short : series of 



small black dots above and below the lateral line ... C. guttulata. 



2. The head is an eye-length shorter than the distance between the 

 gill-openiug and the vent ... ... ... ... C. macrocercus. 



The length of the head, measured to the gill-opening, is equal to or 

 greater than the distance between the gill-opening and the vent : — 



1. The length of the snout is a fifth that of the head : the dorsal fin 



begins in advance of the gill-opening ... ... ... C. squaliceps. 



2. The length of the snout is about a fourth that of the head : the 

 dorsal fin begins above the gill-opening: — 



i. Outer teeth in the jaws decidedly enlarged : vomerine teeth 



in a short very narrow band ... ... ... 0. nasica. 



ii. None of the teeth eularged : vomerine teeth in a very 



broad band of some length ... ... ... C. musteliceps. 



157. Congromurcena squaliceps, Alcock. 



Oongromursena squaliceps, Alcock, Joarn. As. Soc. Bengal, Vol. LXII., pt. 2, 1893, p. 183 . 

 Batkycongrus squaliceps, Ogilby, Proc. Lino. Soc. N. S. Wales, XXIII., 1898, p. 293. 



Head, measured to the gill-opening, about an eye-length, longer than the 

 distance between the gill-opening and the vent, which is not quite one-fourth the 

 length of the tail. 



The snout, which projects far beyond the mouth, is one-fifth the head in 

 length : it is broadish and blunt pointed. The major diameter of the very elliptic- 

 al eye is not quite two-thirds of the length of the snout. The anterior nostril 

 is a short wide tube situated on the lip near the end of the snout, the posterior 

 is a wide foramen situated in advance of and above the angle of the eye. 



The mouth-cleft is wide, extending almost to the vertical through the 

 posterior border of the orbit, and the lips are greatly developed : the minute 

 teeth are in bands in the jaws, and in a broad rasp-like patch outside the mouth 

 in the premaxillary ; there are a few teeth on the vomer quite anteriorly. 



Gill-openings comparatively wide, separate. No scales : lateral line with 

 small pores. Pectorals narrow, half an eye-length longer than the snout. 

 Vertical fins confluent, the dorsal beginning a little in advance of the gill- 

 opening. 



Colour in spirit, grey, the vertical fins in their after half to two-thirds with 

 a black edge, which in the anal tends to involve the whole fin. Pectorals 



