352 Records of the Indian Museum. [Vol. XV, 



3. Size and shape of the proglottides. 



4. Colour being pure white. 



5. Genital pores being irregularly alternate. 

 (). Uterine cavities being absent. 



V. TWO NEW SPECIES OF PARASITIC COPEPODS. 



Ergasilus bengalensis, sp. nov. 

 (Plate XIII.) 



Female (Fig. 1). — Head and first thoracic segment completely 

 tused, with no indication of the line of union. The resulting cephalo- 

 thorax is more or less elliptical, a little arched dorsally, and about twice 

 as long as broad. No rostrum. First three free thoracic segments less 

 than half the width of the carapace. The third, fourth and fifth thoracic 

 segments regularly diminishing in length and breadth ; all three how- 

 ever are distinct. Genital segment barrel-shaped, with the sides evenly 

 rounded, slightly longer than broad and about one and a half times the 

 breadth of the fifth thoracic segment. Abdomen three-jointed and a 

 little more than half the length of the genital segment. First segment 

 longer than the second, which is slightly smaller than the third. The 

 first segment is also longer than the third. Anal laminae rhomboidal, 

 nuich longer than the last abdominal joint, each tipped with two setae, 

 the inner seta nearly twice the length of the outer one. Egg sacs cigar- 

 shaped, smaller than the animal in length, and one-fourth the breadth 

 of the carapace with the six longitudinal rows of eggs. About 120 eggs 

 in each sac. 



First atennae (fig. 2) six-jointed ; joints of unequal length and width, 

 last three segments setose, terminal joint with four setae. Second 

 antennae (fig. 3) four- jointed, first joint roughly triangular, with the 

 base attached to the ventral surface of the carapace. The second 

 joint is attached to the anterior upper surface of the first joint, a little 

 below the apex ; it is more than twice as long as the first, and the third 

 joint is attached to its chisel-shaped distal extremity. The third joint 

 is slightly smaller than the second, and considerably narrower. The 

 terminal fourth joint has the form of a curved claw. 



Mouth farts (Fig. 4). — Labrum {La) large, not reaching the base of 

 the first maxillae. Mandibles [md.) with the cutting edge curved up- 

 wards and forwards, and with a group of spines at their inner edge ; 

 mandibular palps large, triangular, densely covered with setae. Basal 

 portion of the first maxillae {ma-, i.) is an oval papilla with two large 

 spines, of which the inner one is longer than the outer. The second 

 maxillae {mx. ii.) have a broad base with a much smaller distal end, this 

 end bearing a tuft of bristles on its anterior margin only. Labrum {Lb.) 

 flap-like, with the ends running to the curved portion of the second 

 maxillae. 



First four pairs of swimming legs (figs. 5-8) biramose, all the rami 

 three-jointed, except the exopod of the fourth pair, which has two joints. 

 Fifth pair much reduced, knob-like, with a single spine. Basal joint 

 of all quite broad. 



