332 Records of the Indian Museum. [Won Vil; 
a saw rather than a spine. In addition there is a corona of 
spinules on the posterior aspect of the 2nd segment near the distal 
border. 
As will be seen the points in which the present specimens 
differ from P. crassirostris are :— 
1. The absence of spines on the margin of exopod 2 of the 
2nd leg. : 
2. The absence of spines on the posterior aspect of exopod 3 
of the 3rd and 4th legs. 
. The serrated saw on the 5th pair of legs. 
. The shorter terminal joint of the rst antennae. 
- Co 
No corresponding males were found in the collection. 
Paracalanus serratipes, sp. nov. 
Pl. xv, figs. 6-10. 
Several specimens were obtained off Chittagong associated 
with numerous specimens of the preceding species which they 
fairly closely resemble, especially as regards the proportions of the 
body and the 5th pair of legs; they differ, however, both as 
regards size and in the spinulation of the swimming legs. 
As I have already pointed out, it would seem probable that 
for every species proper we have two forms, a first and a second 
sexual stage such as have been shown to exist among the Ostra- 
coda, and I am inclined to think that this form may be the later 
sexual stage of P. dubia, but this is only a matter of opinion and 
I have therefore given it the above ‘“‘ specific’’ name. 
2 Total length r°r mm. 
The body and abdomen were similar to P. dubia and the 
relative proportions of the latter were 22: 12: 11: 18: Io. 
The Ist antennae reach to the middle of the abdomen and 
consist of 23 free joints, the Ist and 2nd and the 8th and oth 
segments being fused; the relative proportions of these joints are. 
as follows :— 
Segments— 
1-2. 3. 4. 5. 6. 7. 8-9. Io. I]. 12. 13. 14. 15. TO. 7. UG LO. 2On 2220128 4 ee 
SIG ie OR ASIA i rol SC INO ey AS TI eG IA, TA TO TS isi RS hSh. WG, Tec 
Segments 2 to g inclusive all bear a transverse row of fine 
spines on their posterior surfaces close to the distal border, and 
on segments 10 to 24 there are longitudinal rows of spines as in 
P. aculeatus. 
Practically the only difference between these two species, as 
regards the 1st antenna, is in the length of the end segment. 
The 2nd antennae and mouth-parts are as in other members 
of the genus. ° 
The 1st parr of legs. The Ist basal segment bears a few spines 
on its anterior surface. The exopodite is three-jointed and the 
Ist joint bears a small transverse row of spines on its distal 
