14 
PACIFIC SCIENCE, Vol. VII, January, 1953 
ite short and broad, with weak lateral spine 
just reaching end of antennular peduncle, 
with squamous portion noticeably longer. 
Carpocerite short, heavy, reaching slightly be- 
yond end of second antennular article. 
Large chela rounded, subcylindrical, length 
about 3.3 times breadth at maximum diam- 
eter; surface of palm toward merus excavate 
permitting flexure of appendage. Fingers over 
0.4 length of chela, distally compressed and 
somewhat curved; dactylus and fixed finger 
with 8 large triangular teeth in opposition, 
tips acute and crossing. Merus slightly longer 
than palm, slender, rounded on outer side, 
flattened on side toward carpus and chela. 
Ischium also slender, 0.5 as long as merus. 
Small chela lacking. 
Carpal articles of second legs with ratio 
10 : 3 : 2 : 2 : 4. 
Third legs with ischium 0.5 length of me- 
rus; merus 4.1 times as long as broad, un- 
armed; carpus over 0.6 length of merus, with 
superior margin projecting, acute; propodus 
0.75 length of merus, with 3 weak spines and 
several bristles; dactylus 0.25 length of merus, 
somewhat curved, slender, simple. 
Telson almost twice as long as broad at 
base; tip almost 0.4 breadth of base; anterior 
surface strongly convex, posterior surface 
more flattened. Terminal cleft of telson about 
I. 5 times as deep as wide, only 0.1 of total 
length of telson. Inner terminal spines equal 
in length to breadth of tip. 
DISCUSSION: The description given above 
and the figures are those of the type specimen 
previously described and figured by Edmond- 
son. The slight differences to be noted on a 
point by point comparison of the two descrip- 
tions are merely differences in interpretation. 
The two species of this genus from Hawaii, 
J. brevirostris and J. mauiensis^ can best be sep- 
arated by two characteristics. First is the na- 
ture of the rostrum, which in J. brevirostris is 
short, reaching only to near the end of the 
first antennular article and correspondingly 
narrow at its base (rostrums of both species 
approach the dimensions of equilateral trian- 
gles), whereas in J. mauiensis it is long, reach- 
ing beyond the end of the second antennular 
article, and broad at its base. Furthermore, in 
J. brevirostris the rostrum and anterior cara- 
pace carry a carina that is lacking in J. maui- 
ensis. Second is the nature of the terminal cleft 
of the telson, which in J. brevirostris is narrow 
and deep, about 1.5 times as deep as broad at 
the outer edge, whereas in J. mauiensis it is 
broad, less than half as deep as broad at the 
outer edge. Other slight differences can be 
found in the length of the stylocerite, the ratio 
of the lengths of the articles of the antennular 
peduncles, the merus of the third legs, and 
other characteristics. 
DISTRIBUTION: The two specimens known 
were collected from Waikiki Reef (the type 
locality) and from the nearby reef at Kahala, 
Oahu. 
Alpheopsis Coutibe 
Frontal border of carapace produced into 
rostrum and projection that screens eyes from 
above; orbital teeth present or absent. Cornea 
of eyes visible from front and maybe from 
sides. 
Antennular peduncle short and stout; sty- 
locerite variable. Scaphocerite usually broad 
without heavy lateral spine. Carpocerite long. 
Large chela carried extended, without 
grooves or sheaths. Carpus globular, merus 
roughly triangular. Chelae show slight asym- 
metry; either entire and subcylindrical or with 
lines and depressions. Fingers compressed, 
either without teeth or with simple arrange- 
ment of exactly fitting teeth. 
Second thoracic legs with carpus of three 
articles (H. idiocarpus Coutiere) or five. 
Following legs robust, without teeth on 
merus; propodus weakly spinose; dactylus bi- 
unguiculate or simple. Propodus of fifth legs 
with or without ’’brush” of bristles. 
Sixth abdominal segment without articu- 
lated pleura only in A. biunguicidatus Banner. 
Posterior border of telson rounded. 
Branchial formula: 5 pleurobranchs, 1 ar- 
throbranch, 8, 7, or 6 epipodites. 
