iQoy-] Records of the I ndian Museum.. 27 



18. Chydorus glohosus, Baird. 



Two somewhat immature specimens of this species were found 

 in a collection from the Museum tank at Calcutta (No. 8). 



rg. Dunhevedia crassa, King. 



A single specimen was found in the Museum tank. 

 If the identity of this species with D. sctigera (Birge) is accepted 

 (Stingelin, 1904), then its distribution is ])ractically world-wide. 



COPEPODA. J 



20. Pseudodiaptomus lobipes, n. sp. 



Body slender and more or less cylindrical, the head fused 

 completely with the first thoracic segment (fig. 3). The last seg- 

 ment of the thorax is rounded at the angles and bears on each side 

 a small spine, but no cilia. The abdomen, in the female, consists 

 of four segments ; the genital segment is scarcely at all dilated. 

 Dorsally it bears minute spines arranged in three transverse rows, 

 the two anterior rows broken in the middle (figures 23 and 24). 

 Laterally there are two groups of larger spines, about four in each 

 group. The posterior edges of the two succeeding segments bear 

 each a row of teeth. The last segment is much shorter than the 

 preceding ones. The f ureal rami are divergent, and about four 

 times as long as wide, with long cilia fringing the inner edge. In the 

 male the abdomen consists of five segments, the second, third and 

 fourth toothed along their posterior edge. 



The antennae are scarceh^ as long as the thorax and consist 

 of twent3^-one joints. In the male the terminal section of the 

 prehensile antenna consists of three joints, the line of division 

 between the second and third not ver}^ distinct. 



The fifth foot of the female is one-branched and made up of 

 three joints (fig. 4). The second joint, which is the longest, is 

 produced at its distal external angle into a strong spine. On its 

 inner face, towards the end, it bears two h5^aHne membranes the 

 distal one very large. The last joint is produced distally into a 

 long strong spine, and at the base of it there are three short ones. 

 Of these three one is stouter than the others and is toothed on each 

 side ; the other two are toothed along one side only. 



In the male the right foot of the fifth pair is one-branched and 

 consists of six joints in all, apparently a two-jointed basal part and 

 a four-jointed exopodite (fig. 6). The second joint of the exopodite 

 is produced into a strong spine. The terminal joint is broad and 

 flattened at the base, but continued as a curved spine (fig. 7). The 

 left foot (fig. 8) consists of a basal portion bearing a long laminal 

 process corresponding to the endopodite, and a distal part of two 

 joints representing the exopodite. The second joint of the exo- 

 podite is broad and flattened, with a small hyaline membrane on 

 its outer edge. 



Length of female, "35 mm. 

 ,, male, -95 mm. 



