304 Records of the Indian Museum. [ VoL. VIF; 
2. Pseudodiaptomus hickmani, sp. nov. 
Pl. xxii, figs. I—7. 
Occurrence: Locality Q. 
Several specimens were obtained, both males and females ; they 
appear to differ from any previously described species, and I have 
mtich pleasure in naming it after Commander C. S. Hickman, 
R.I.M., Officer in charge, Marine Survey of India. 
2 Total length 1°37 mm. 
The abdomen and furea are contained twice in the length of 
the cephalo-thorax. The head is separate from the Ist thoracic 
segment and terminates anteriorly in a bifid rostrum with long and 
delicate spines. The 5th thoracic segment is armed laterally with 
a sharp spine, directed backwards and slightly outwards. The 
abdomen is composed of four segments, the first three of which 
are armed posteriorly with a row of triangular teeth extending 
across the dorsal surface. The relative lengths of these segments 
and ‘the fureal tami’ ate a0c Ae 67497, 2 ie laters aren tanee 
times as long as wide. 
The genital segment has a well-marked ventral swelling, and 
the genital operculum is produced posteriorly in a single spine 
on the right side. On the right side of the segment is a blunt 
spinous process and anterior to the genital orifice is a curved row of 
needle-shaped spines, which terminates laterally in the above men- 
tioned process. Dorsally the segment is armed on each side 
with an elongated group of very fine spines. 
The Ist antennae are composed of 21 joints having the follow- 
ing relative proportions :— 
_I. 2. 3. 4. 5. 6. 7. 8. 9. To, 11. 12. 13. 14, 15. 16. 17. 18. 19. 20. 21. 
[ps OelAded: VolO lwo Lea owas al Aon ls eng eet On nam Dean ren se 
The 2nd antennae have the usual characters as in the other 
members of the genus, but differ from the others in possessing a 
row of fine spine-like processes on the margin of the last segment 
of the endopodite. 
In the 1st pair of legs the endopodite and exopodite are of 
nearly the same length. The Ist joint of the exopodite bears a 
long slender serrated external margin spine and the 3rd joint has 
two short non-serrated external spines and a terminal spine, whose 
length is almost equal to the combined length of the last two 
segments ; the 2nd joint is without a spine. The Ist joint of the 
basiopodite bears two rows of delicate spines on its antero- 
external surface, one at its distal margin and the second, in 
which the spines are somewhat longer, about the middle of its 
length. . 
The 2nd-4th pairs of legs are of the usual type, but the 2nd 
pair differs in having three series of very delicate spines on the Ist 
joint of the basiopodite ; two of these are similar to those of the 
Ist leg, the third is a delicate row of spines proximal to the origin 
of the seta on the inner border. 
