igoy] Recor(/s of flic Indian Museum. 29 



22. Diapioiiiiis ciiic/fts, n. sp. 



Form of the body slender, of almost equal width throughout, 

 the head marked off from the thorax by a constriction (fig. 11). 

 The line of division between the last two thoracic segments is 

 marked by a ring of minute teeth. In some specimens the ring 

 appears to be incomplete, no denticles being visible on the 

 dorsal surface. In the female the last thoracic segment is asym- 

 metrical ; on the. right it is simply rounded and bears a single 

 small spine, while on the left it is produced into a peculiar rounded 

 lappet bearing two short spines. In the male this segment is also 

 slightly asymmetrical, being somewhat produced on the right, 

 bearing a spine on this side, but being simph^ rounded on 

 the left. The abdomen of the female consists of three seg- 

 ments, of which the first is as long as the other two and the furca 

 together. This segment is not much dilated and bears a spine on 

 each side, that on the left being a little posterior to and larger 

 than that on the right. In the male the first abdominal segment 

 bears a long, slender spine on the right side. 



The antennae reach, when reflexed, considerabl}^ beyond the 

 furcal setae. The prehensile antenna of the male is scarcely at all 

 dilated; the antepenultimate joint has a narrow h3^aline lamella, 

 and is prolonged into a curved process about two-thirds as long 

 as the succeeding segment and minuteh^ bifid at the tip. 



The fifth leg of the female has the endopodite about three 

 quarters the length of the first joint of the exopodite, one-jointed 

 and slender fig. 12). The third joint of the exopodite is absent, 

 its place being taken b}" two short spines with a seta between them. 

 The second joint seems to be variable in length, in some specimens, 

 and in one case in one leg of the two, it is shorter and stouter than 

 in the one regarded as typical. In the male the basal joint of 

 each leg bears a hyaline lamella on its inner face. The endopo- 

 dite of the right leg is short and conical, longer than the first 

 joint of the exopodite The endopodite of the left leg is rather 

 long and slender and the exopodite is finger-shaped, with a long 

 inner seta. The second joint of the exopodite of the right leg 

 bears a short lateral spine ver^^ near its base. The terminal spine 

 is relatively short and blunt at the tip. 



lycngth of female, i'i5 mm. 

 ,, ,, male, i"0 mm. 



A few females and two males occurred in a swamp at Chakra- 

 dharpur and one or two specimens in a tank at the same place 

 (Nos. 14, 16). 



23. Diaptomus blanci, De Guerne and Richard. 

 Several specimens taken at Chakradharpur (No. 17). 



24. Diaptomus pulcher, n. sp. 



Body rather stout, the greatest width about the middle, 

 tapering anteriorly (fig. 13). The last thoracic segment of the 



