532 Memoirs of the Indian Museum. [Vol. V, 



i mile E. by N. of Patsahanipur. Five. 



2 miles E. by S.|S. of Patsahanipur. Several. 



i to 9 miles N.E. by E. of Kalidai. Several. 



Specific Diagnosis: — 



Body long and narrow, side plates small, much shallower than the segments. 

 Pleon segment 3 with the postero-lateral angle quadrate. Eyes small, irregular, 

 apparently imperfect. Upper antenna about three-fourths the length of body, first 

 and second joints of peduncle subequal, elongate ; third short, flagellum slender, 

 longer than peduncle, accessory flagellum of two slender joints. L,ower antenna a 

 little longer than peduncle of upper, last two joints of peduncle subequal, flagellum 

 shorter than last joint, consisting of one long joint followed by two or three 

 indistinct ones. First gnathopod with the merus produced posteriorly into a 

 rounded lobe, carpus much longer than the propod, with numerous tufts of setules 

 on the posterior margin and on the surface near to it ; propod widening distally, palm 

 nearly transverse, evenly convex. Second gnathopod much larger than the first, 

 carpus short, about one- third the length of the propod ; propod irregularly oval, palm 

 oblique, sinuous, about equal in length to the hind margin ; finger strongly curved, 

 bulging on the inner margin near its base. Third, fourth and fifth peraeopods 

 increasing in size posteriorly, basal joint in the third narrow, slightly wider in the 

 fourth and greatly widened and enlarged in the fifth, its posterior margin irregularly 

 serrate, most distinctly so in the fifth peraeopod ; in the fifth peraeopod the merus 

 is dilated posteriorly. Third uropods greatly elongated, peduncle longer than the 

 telson, outer branch formed of two subequal joints, somewhat broadened, inner 

 branch small, tapering, tipped with one or two setae. Telson cleft to the base, each 

 lobe narrowing posteriorly and bearing a stout setule at the extremity. 



Colour (in spirit), whitish. 



Length of body, about 10 mm. 



I have referred this species to the genus Niphargus with which it agrees in most 

 characters. It differs, however, from Stebbing's generic diagnosis (1906, p. 405) in 

 the following points : — 



1. The eyes are moderately well developed. 



2. The third joint of the mandibular palp is hardly longer than the second. 



3. The inner plate of the first maxilla is large and bears numerous setae. 



4. The outer plate of the maxilliped bears numerous setae all of the same 



character, but has no spine teeth. 



5. The second gnathopod is larger than the first and differently shaped. 



The following are additional notes on the structure of this species. Most of the 

 figures are taken from the type specimen which was the first one examined. Some 

 specimens, rather larger, show slightly more developed characters in the antennae, 

 gnathopods and in the fifth peraeopods in which the basal joint may be larger in 

 proportion to the rest of the limb than is shown in figure 4p. 



The basal portions of the antennae are shown in figure 46 from which the 



