1922.] W. M. Taytersall: Indian Mysidacea. 485 



lamellae in the female, hispid all over, the spinules thickest on the 

 posterior segment of the abdomen and on the anterior part of the 

 thorax. Fully grown males appear to be much smoother than 

 young males and females. 



Carapace produced in front into a short triangular rostral 

 plate with pointed apex. 



Eyes large, cornea wider than the rest of the eye, pigment 

 black. 



Antennal scale barely outreaching the antennular peduncle, 

 seven times as long as broad, terminal joint about one-tenth of the 

 total length of the scale. 



Tarsus of the thoracic limbs three-jointed. 



Telson one and a half times as long as the last abdominal 

 somite lanceolate in shape, entire, about twice as long as broad at 

 the base, suddenly narrowing a short distance from the base and 

 gradually narrowing from that point to a bluntly rounded apex, 

 the proximal part of the lateral margins smooth except for three 

 small spines on each side of the widest part of the telson, apex 

 armed with from 6-8 strong spines of equal length with no smaller 

 spines between them, distal part of the lateral margins armed with 

 numerous spines of varying sizes, about seven to nine of these 

 spines much larger than the rest and placed more or less at regular 

 intervals, between them groups of smaller spines, 3-5 in a group, 

 grading in size, the smaller ones anterior and the larger ones 

 posterior. In small specimens the large spines arming the telson 

 are relatively more prominent than in larger specimens and the 

 telsons of both sizes look strikingly different. But I think the 

 difference is entirely due to differences in size and the development 

 of the subsidiary spines. 



Inner uropod slightly longer than the telson with a group of 

 five graded spines on the lower inner margin, near the statocyst. 



Outer uropod one-seventh longer than the inner. In young 

 specimens the uropods are more equal in size. 



Fourth pleopod of the male, with its terminal setae, not 

 reaching as far as the telson, endopod well developed, of normal 

 form, exopod two-jointed, the terminal joint about one-seventh of 

 the length of the proximal joint and bearing two long stout 

 plumose setae about three times as long as the joint itself. 



Fifth pleopod of the male much longer than the first, second 

 and third, but of the same form. It is nearly as long as the sixth 

 abdominal somite and the apex bears two specially strong and 

 long plumose setae. 



Remarks . — This species is distinguished fromiV. longicornis at 

 once by the armature of the telson. In N. longicornis the spines 

 arming the telson are more equal in size and there are not any out- 

 standing spines of much greater length than the rest. In N. slelleri 

 Derzhavin (1913) the telson has special spines of outstanding 

 length separating groups of spines, but the spines on the telson 

 extend along the entire margin, whereas in N. indica the proximal 



