100 
Pleura of first abdominal segment showing 
sexual dimorphism, in male ending posteri- 
orly as dentate process that points slightly 
posteriorly, in female rounded. Following 
pleura of usual shape. 
Telson 1.7 times as long as broad, tip 0.7 as 
wide as base; sides straight and posterior mar- 
gin somewhat arcuate; dorsal surface slightly 
depressed medially. Dorsal spinules large, pos- 
terior pair located near middle; posterior mar- 
gin usually with series of about 10 very feeble 
spinules. Inner branch of uropod with strong 
spines on posterolateral margin. 
Most specimens were 10 mm, long or less; 
however, those specimens from Kaneohe Bay, 
Oahu, listed below reach 17.6 mm. in length. 
Color in life not observed. 
DISCUSSION: This species, as well as the two 
other members of this subgroup from Hawaii, 
has been found to vary considerably in char- 
acteristics commonly accepted as of taxonom- 
ic importance. 
The ratio of the lengths of the articles of the 
antennular peduncle varies considerably, with 
the second article varying from 1.4 to 2.0 
times the length of the visible portion of the 
first article. The stylocerite varies from mark- 
edly shorter than the first antennular article to 
almost equal in length. 
The relative lengths of the antennular pe- 
duncle, the scaphocerite, and the carpocerite 
also vary. In some specimens the scaphocerite 
is scarcely longer than the antennular pedun- 
cle, and in turn is greatly exceeded by the car- 
pocerite; in others the scaphocerite is almost 
equal to the carpocerite, and both extend far 
beyond the end of the antennular peduncle; 
although the carpocerite is always longer than 
the antennular peduncle, the amount by which 
it exceeds is variable. The lateral spine of the 
basicerite also varies in size and in some speci- 
mens is so reduced that it is difficult to dis- 
cern. 
The large cheliped is constant in its general 
form in all specimens but varies somewhat in 
its proportions; in one specimen the tooth of 
PACIFIC SCIENCE, Vol. VII, January, 1953 
the inferior internal margin is reduced and 
rounded (Fig. 34^). 
As noted by Coutiere, the small chela is 
sexually dimorphic, but the breadth of the 
dactylus of the male is greater in proportion 
in larger specimens, and in the largest speci- 
mens it is broader than that described by Cou- 
tiere. 
In the second legs the second carpal article 
is usually nearly three times the length of the 
first, but it varies more or less continuously 
from 2.2 to 4.0 times as long. The proportions 
of the other articles also vary but not as much. 
The spines on the carpus of the third legs 
usually are two in number but vary from one 
to five. The spines along the inferior margin 
of the propodus vary from 8 to 13. Studies 
were not made on the size of the secondary 
unguis of these legs because it was so difficult 
to rotate the leg to where the full unguis could 
be seen; however, they, too, appear to vary, 
being quite reduced in some specimens. 
In none of the specimens examined does 
the sixth abdominal somite bear spines. The 
telson was not measured over a series of in- 
dividuals, but examination did not show that 
it varies greatly in general shape. How vari- 
able the spinules on the tip of the telson are 
could not be determined, as at best they are 
exceedingly difficult to discern. In some speci- 
mens they may have been missing. 
This form evidently has been described 
under two names: as C. paralcy one (Coutiere) 
from the Maldives and Laccadives in the In- 
dian Ocean and as C laysani Edmondson from 
the Hawaiian Archipelago. The two species 
appeared to be separate and valid on the basis 
of the original descriptions, but when the 
variation within the form is considered it ap- 
pears that there are no important differences. 
The original descriptions of the two species 
showed the following characteristics in com- 
mon: the length of the stylocerite; the shape 
of the front of the carapace except for the ros- 
trum; the shape of the large and small cheli- 
peds; the shape and armature of the third legs; 
and the shape of the telson. On the basis of 
