238 SURGEON F. DAY ON INDIAN SILUROID FISHES. [Apr. 4, 



round or oval form, situated in the anterior part of the abdomen, 

 and resting against the almost horizontally expanded lateral processes 

 of the first two vertebrae, to which it has also tendinous attachments. 



Macrones nangra, Ham. Buch. 



D. ||0. P.i. V. 6. A. J. C. 17. 



Length of head f, of caudal f, height of body T 2 T of the total 

 length. 



Eyes rather high up, situated in the anterior half of the head, and 

 1^ diameter from the end of the snout. 



A wide and deep superior longitudinal furrow extends from the 

 snout to the posterior end of the occipital process, which latter is 

 above half longer than broad at its base. The basal bone of the 

 dorsal fin is extended laterally as well as anteriorly, where it meets 

 the occipital process, there being no separate interneural bone. The 

 width of the head at the opercles ecpials its length. 



Mouth wide, cleft shallow, the upper jaw much longer than the 

 lower. Nasal barbels slightly longer than the head, the maxillary 

 ones reach the vent, the external mandibular ones extend to the base 

 of the ventral, the internal ones to the base of the pectoral. 



Teeth villiform, in an uninterrupted crescentic band. 



Fins. Dorsal spine weak, smooth, half as long as the head ; pec- 

 toral spine moderately strong, nearly as long as the head without the 

 snout, and having nine strong denticulations internally. Length of 

 base of adipose dorsal equals the distance the fin commences from the 

 termination of the base of the first dorsal, and is as long as that of 

 the anal. Caudal deeply forked, lobes of equal length and pointed. 



Colours. Muddy, slightly clouded in places. 



Hab. Allahabad, in the Ganges, attaining 1| inch in length, and 

 not uncommon. 



Genus Rita. 



In the R. crucigera, Owen (if differing from the R. kuturnee, 

 Sykes, which appears doubtful), the air-vessel is in the abdominal 

 cavity ; it has a strong white tendinous covering, which sends down 

 partitions subdividing it into three portions, the one being anterior, 

 the other two posterior and lateral, whilst their walls are very thin. 



Genus Hemipimelodus. 



In the H. cenia, Ham. Buch., the air-vessel is laterally divided 

 into two lobes and entirely enclosed in bone, as in the majority of 

 the Loaches (Cobitidina). 



Glyptosternum telchitta, H. Buch. 



D. ||0. P. g. V. 6. A. i. C. 15. 



Length of head \, of caudal above ^, height of body T 2 3 of the 

 total length. 



Eyes small, situated in the commencement of the posterior half of 

 the head. 



