752 



Memoirs of the Indian Museum. 



[Vol. V, 



The measurements in hundredths of the length without the caudal fin are as follows : 

 the length of head 25-3—27-6%, the depth of the body 19-6—22-2%, the length of the 



Text-fig. 31. — Micrapocryptes fragilis, gen. et sp. nov. : x4. 



snout 4-4 — 5-5%, the horizontal diameter of the eye 5-5 — 6-8%, the length of the pectoral 

 fin 19-5—21-6%, the length of the pelvic fin 9-5—11-1%, the length of the caudal fin 

 17-6 — 20-4%, the least height of the caudal peduncle 10-4 — 13-8%, the length of the caudal 

 peduncle 24 — 27-6%, the width of head 17-6- — 18-1% and the depth of head at occiput 

 17-6— 18-1%. 



The distance between the anterior origin of the first dorsal fin and the tip of the snout 

 is equal to the distance between the anterior origin of the second dorsal and the base of the 

 caudal. The distance between the anterior origin of the first dorsal and the anterior origin 

 of the second dorsal is almost equal to twice the depth of the caudal peduncle. The anterior 

 origin of the anal, which is situated slightly behind the origin of the second dorsal, is almost 

 midway between the tip of the snout and the posterior margin of the caudal. The distance 

 between the origin of the pelvic and the tip of the snout is equal to the distance between 

 the last ray of the second dorsal and the base of the caudal. The base of the anal is longer 

 than the base of the second dorsal and is almost equal to twice the diameter of the eye. 

 The least height of the caudal peduncle is equal to the length of the pelvic and is half the 

 depth of the body below the anterior origin of the first dorsal fin. 



The eyes are prominent and are situated on the sides ; they bulge outwards and are 

 visible from above as well as from below. The postorbital region of the head is almost equal 

 in length to the remaining portion, and is twice the horizontal diameter of the eye. The 

 snout is shorter than the diameter of the eye. The mouth is oblique and is turned upwards ; 

 the lower jaw is longer than the upper. The gape of the mouth reaches to below the anterior 



margin of the orbit. 











The teeth show considerable variation with the sex and the age of the individuals. 



The structure of teeth is exactly alike in the young of both 

 sexes. In both jaws there are a number of small conical 

 teeth. They are minute and closely fitted together and their 

 number is rather difficult to determine. They project very 

 little beyond the jaws and, indeed, to the naked eye the jaws 

 appear edentulous. The teeth are developed in very young 

 specimens but it is only with great difficulty that the two 

 Text-fig. 32.— Tooth-bands of Mi- canines on the mandibular symphysis can be made out. As 

 crapocryptes fragilis, gen. et. sp. ^ ma ture, the teeth of the female do not undergo any 



nov.: x 18. ' ° J 



appreciable change and continue to be just as in the young 

 condition. In a ripe male, however, the dentition is absolutely different. Instead of 



