28 



Records 0/ the Indian Museum. 



[Vol. XXII, 



specimen there are no special scales in the region of the ventrals 

 and the arrangement of these is not interrupted on the left side. 



It is rather interesting to note that on dissection of this 

 region the fin muscles and the girdle of the right side only were 

 found to be present, while on the abnormal side no trace of either 

 the muscles or the girdle was observed. 



The abnormal specimen is 62 mm. in length and was collected 

 in the Etok stream near Chanderkhong with eleven other normal 

 specimens of the same species. The average length of the species 

 is 85 mm. 



(iii) In a specimen of another new species, Nemachilus kang- 



Text-fig. I. — Normal and abnormal specimens of Barilitis barila (Ham. 

 Buch.l 

 I. Normal specimen X 2. 2. Abnormal specimen x 2. 



a:=Lepidosis in the region of the ventrals. 



■jupkhulensis, the ventral fin of the right side is lacking. Even the 

 fin on the other side is not normal. It is cUstorted in such a way 

 that there appear to be two fins, one immediately behind the 

 other. In the anterior portion of the abnormal fin there are three 

 rays while in the posterior only four. In a normal specimen there 

 are in all six to seven rays in the ventral fin. There is no indica- 

 tion that the absence of the ventral fin is due to any accident or 

 injury. The abnormal specimen was collected in a small hill 

 stream near Bishenpur, Manipur. It is about 43 mm. in length 

 which is the average length of the species. 



(iv) The most interesting specimen is that of Rita rita (Ham. 

 Buch.), in which the pectoral fin of the right side is absent. The 



