490 



Records of the Indian Museum. [Vol. XXIV, 



Third, fourth, sixth and seventh thoracic limbs of similar 

 structure, tarsus unjointed, equal in length to the merus and to 

 the ischium, nail only distinguishable from the other setae by its 

 swollen base. 



Fifth thoracic limb longer than any of the others, merus at 



Text-fig. 23. — Idiomysis i)iermis, gen. et sp. now 



a, lateral view of adult male, X 21 ; b, dorsal view of anterior end, x 22 ; 

 c, antennal scale, X 65 ; d, mandible, X 100; e, first maxilla, x 100; f, second 

 maxilla, X 100. 



least twice as long as the preceding joint, tarsus about one-third 

 longer than the merus but much narrower, two-jointed, the second 

 joint one- third of the length of the first, nail with a swollen base. 

 Eighth thoracic limb much reduced in size, endopod possess- 

 ing the full number of joints, shorter than the exopod, joints 

 narrow and feebly armed. Exopods of all the thoracic limbs with 



