18 
PACIFIC SCIENCE, Vol. VII, January, 1953 
(?) Alpheopsis hiunguiculatus sp. nov. 
Fig. 5 a-h 
TYPE specimen: a male 8.4 mm. long col- 
lected from a head of Pocillopora meandrina 
Verrill from the intertidal zone at Halape, Kau 
Coast, Hawaii, by R. W. Hiatt. This is the 
only specimen of this species in the collection 
(U. S. N. M. 93451). 
DESCRIPTION: Front of carapace projecting 
over eyes but abruptly truncate and flattened 
dorsally; without keels, ridges, or grooves. 
Rostrum, in dorsal view, very small, narrow 
and acute, reaching only 0.7 of length of first 
article of antennular peduncle; ventral keel 
and abrupt truncation in lateral view. Hoods 
over eyes slightly inflated, without teeth or 
other projections. Eyes extending slightly be- 
yond margins of hoods in lateral view. Ptery- 
gostomial angle rounded. 
Antennular peduncle short and heavy, with 
visible portion of first and second article each 
0.2 mm. long, with third article 0.25 mm. 
long; second article 0.23 mm. wide. Styloce- 
rite short, rounded, with short acute spine 
arising abruptly from lower margin, tip not 
reaching to end of first antennular article. Sec- 
ondary bifurcation of outer flagellum well de- 
veloped. All flagella broken before tip. 
Lateral spine of basicerite acute, short, not 
reaching to end of broad portion of styloce- 
rite. Scaphocerite broad, with lateral spine 
poorly developed, about as long as squamous 
portion. Scaphocerite and antennular pedun- 
cle equal in length, both considerably longer 
than carpocerite. Antennular flagella lost. 
Third maxillipeds with basal article (ischio- 
merus) 0.68 mm. long, 0.17 mm. broad; car- 
pus 0.30 mm. long, 0.12 mm. broad; third 
article (propo-dactylus) 0.30 mm. long, O.IO 
mm. broad. Appendages with scattered hairs 
along basal joints, 8 rows of short stiff bristles 
on terminal article, 2 spiniform bristles on end 
of first article, and 4 on second article. Exopod 
reaching to middle of carpus. 
Large chelipeds lost. 
Second thoracic legs 3.2 mm. long. Carpal 
articles with ratio 10:8:6:6:10. Length of 
first secondary article 5.8 times breadth. 
Third legs moderately heavy, 3.1 mm. long. 
Ischium 0.34 mm. long, with strong movable 
spine. Merus 0.95 mm. long, 0.23 mm. broad 
(4.1 times as broad as long), with 2 movable 
spines. Carpus 0.45 mm. long, 0.16 mm. 
broad, unarmed. Propodus 1.04 mm. long, 
0.14 mm. broad, with 6 small movable spines, 
2 on distal end. Dactylus 0.29 mm. long, 
0.09 mm. broad, with strong secondary un- 
guis. 
Fifth legs similar to third with slight differ- 
ences in proportions. Propodus with no sem- 
blance of "brush,” but with 4 feeble spines. 
Secondary unguis of dactylus poorly devel- 
oped. 
Basiopodites of first 4 pairs of pereiopods 
with rudimentary exopodites(?) (Fig. 5/^). 
Pleura of sixth abdominal segment not ar- 
ticulated. 
Telson 1. 18 mm. long, 0.55 mm. broad at 
base (2.1 times as long as broad), with tip 
0.25 mm. broad. Lateral margins slightly con- 
vex; terminal margin more markedly convex. 
Four pairs of long setiferous bristles between 
2 terminal spines. Dorsal spines 0.5 and 0.8 
mm. from anterior end. Anal tubercles absent. 
Branchial formula: 5 pleurobranchs, I ar- 
throbranch (rudimentary), 7 epipodites (mas- 
tigobranch on seventh leg poorly formed; 
setobranch lacking on eighth). 
DISCUSSION: Unfortunately, this most per- 
plexing species is represented by a single 
broken specimen, so any conclusions about it 
must be tentative. It was placed in this genus 
because in most characteristics it is very much 
like A', equalts Coutiere. However, the lack of 
articulation of the pleura of the sixth abdom- 
inal segment and the presence of exopodites 
on the periopods raise serious doubts as to its 
relationship to this genus. The second char- 
acteristic may not be of any worth, possibly 
being merely a persistent larval characteristic 
or an atavism. Because the specimen is incom- 
