346 Records of the Indian Museum. [WoL Vaile 
alter in character and has assumed the form described by Brady 
(1883, p. 95, pl. xlv, fig. rz) in his Pontella inermis. 'The 
segments 12—16 form a spindle-shaped swelling, but the distal 
segments have not yet fused completely together, though segments 
19—2I1 show signs of so doing, and there is no distinct knee-joint 
present. Segment 14 bears a long spinous process, and from the 
distal end of segment Ig a spinous process arises and extends to 
the end of segment 2., this is the future toothed-plate. 
The 5ih pair of legs is symmetrical and consists of two 
segments only, the distal of which closely resembles the exopod of 
the femak leg; there is no endopodite present. They reach to 
the end of the 2nd basal joint of the 4th leg and, as in the imma- 
ture Labidocera euchaeta, are slightly constricted at the level of 
the first marginal spine, thus indicating where the division into 
two segments will occur at the next moult. 
It is interesting to note that in stage 2, that is, in the first 
sexually mature stage of the males of both Labidocera euchaeia and 
Pontella andersonz, the terminal part of the claw of the 5th right 
leg is broad and stout and comparatively short, and it may be that 
this is one of the characteristics of this stage of development, the 
slender spinous-type of joint being developed only in stage 1. 
Genus Acartia. 
Acartia tortaniformis, sp. nov. 
P]. xxi, figs. I—1rOo. 
Several examples of both sexes were obtained. 
9 Total length 1-4 mm. 
The head and ist thoracic segment are separate. ‘Thoracic 
segments 4 and 5 are fused together and have a rounded posterior 
margin. Anteriorly the rostrum is absent, and the line of the 
forehead is continued round to the ventral surface, where it termi- 
nates in a hair-bearing ridge. 
The abdomen is long and is contained 14 times in the length of 
the cephalo-thorax ; it contains 3 segments and a pair of furcal 
rami which are long, the proportions being 9:7: 5: io. The Ist 
segment bears a row of spines transversely across its dorsal surface 
and scattered spines on the anterior half of its dorsal aspect. 
The furcal rami are symmetrical and terminate in four setae, 
the fifth arising from the external margin; the 2nd is longer than 
the others and is somewhat stouter at its base: this latter feature 
is however much more marked in the males. An accessory seta also 
arises from the dorsal surface. 
The 1st antennae reach to the beginning of the furcal 
rami; as usual it is difficult to determine the boundaries of the 
various segments in the proximal part ; the proportional lengths of 
the segments are as follows :— 
segments— 
I. 2-6. 7. 8. Q. TO. A.A 2, 13, aA ols, 66,017.18, 1G, 2Onel wea aed 25. 
10, 36. 12, 15. 3: LISTT. SO.g. 212) Tan eis eI) 2c. Toso. Teneo mene 
