242 
HORN EXPEDITION-CRUSTACEA. 
Anterior margin varies from nearly straight to convex, posterior margin more 
distinctly convex than in L. squirei; ventral margin faiidy uniformly rounded. 
Lines of growth ten to thirteen in number. Backwardly-directed spines of similar 
structure to those of L. squirei^ and from about two to thirteen in number. 
Punctations on cai’apace much coirser than in the preceding species, but still not 
discernible with an ordinary hand lens. 
Size of 
Spirit Specimens. 
Male. 
Male. 
Female 
with ova. 
Length of carapace 
13‘5 mm. 
13'5 mm. 
13 mm. 
Height 
7-2 „ 
8-7 „ . 
.. 8 „ 
Thickness through both valves 
- 3 „ ... 
3 „ . 
.. 3 „ 
Body attached to carapace as in Z. squirei. 
Head in both sexes shaped like that of the female of Z. squirei., and showing 
no difference in the two sexes excepting in tlie rostrum. This in the male is 
similar in form and proportions to that of Z. squirei, while in the female it is 
shorter than in the male, but is also bent at an angle to the front line of the head. 
Fii'st anteniue in the male reaching as far as the distal end of the proximal 
portion of the second antenme. Those of tlie female are slightly shorter. The 
projections are more strongly marked in the male than in the female. 
Second antenna? on the same plan as in Z. squirei, with the following differences. 
The basal part has about nine spines instead of eleven. The lower division of the 
flagellum has about fifteen joints and the upper about fourteen. 
The setose projection of the labrum is proportionately longer than in 
Z. squirei. 
Legs twenty-six pairs in number and similar to those of Z. squirei. 
The telson is about equal in length to the seven preceding abdominal segments. 
There are about ten to fifteen spines on the dorsal edges, vai-ying irregularly in 
size. Caudal setie and caudal appendages as in the preceding species, the spines 
on the latter, however, being more strongly marked. The telson can lie readily 
distinguished from that of Z. squirei by its much smaller number of spines on the 
dorsal edge, by its greater curvature, and by the presence of a pair of very large 
backwarely-curving spines which greatly modify the general outline of the dorsal 
edge. 
