376 Records of the Indian Museum. [Wor. VIT; 
| Intermediate 
P. herdmani. P. macronyx. form 
|- 
5th pair of legs | Symmetrical. Each 2/Asymmetrical. As P. macronyx. 
branched. Each branch| Inner margin of | 
bifid. right exopodite | 
produced into a | 
strong spine. 
The spine on 
the inner mar- 
gin of the left 
leg has become 
suppressed. 
In a few cases the abdomen, instead of being almost symmetri- 
cal, is produced on the left side into a long spine-like process, this 
being apparently an exaggerated phase of the condition normally 
found in which a rod-like spine is present at this point (plate 
xxiv, fig. 5). 
From the above it would appear that we are here dealing with 
another example of continuous variation, apparently affecting only 
the females of the species, for as the habitat extends to the 
westward we meet with a tendency for a reduction of the number 
of spines on the genital segment of the abdomen, a fusion of 
certain joints at the base of the antennae, and the formation of a 
second spine on the left 5th leg. 
2, Pontellopsis krameri, Giesbrecht. 
@ A single specimen was obtained in each locality A and J 
and two in locality P. 
The asymmetry of the furcal joints was well-marked and 
corresponded with Giesbrecht’s original figures. The spines on 
the 5th pair of legs also resembled those in Giesbrecht’s specti- 
mens. In both these points the specimens differed from Wolfen- 
den’s description of the specimens obtained by him in the Maldive 
and Laccadive Archipelagoes. 
3. Pontellopsis regalis (Dana). 
Occurrence: Localities A, C, D, E, K. 
A few specimens were obtained in each of the above localities, 
but on the whole the species was comparatively rare. 
Genus Acartia, Dana. 
1. Acartia danae, Giesbrecht. 
A single specimen, a female, was obtained in locality F. 
