Hawaiian Crangonidae — BANNER 
21 
TABLE 1 
Branchial Formula of the Genus Neoalpheopsh 
PLEURO- 
BRANCHS 
ARTHRO- 
BRANCHS 
EPI- 
PODITES* 
Maxillipeds 
1 
1 
2 
1 
3 ” 
a 
Thoracic legs 
1 
1 
1 
a, 13 
2 
1 
a, 13 
3 
1 
a, 13 
4 
1 
at, /3 
5 
1 
* The designations a and jS are used here as they 
are applied by Coutiere (1899: 268-286), where a re- 
fers to the arm-like mastigobranch, and ^ refers to the 
small setiferous lobe-like setobranch. 
t This epipodite reduced to a small protuberance. 
the lack of the well- developed plunger and 
adhesive plaques on the dactylus of the large 
chela. 
Neoalpheopsis bears a superficial resemblance 
to Jousseaumea Coutiere as both the frontal 
border of the carapace and the teeth on large 
chela are similar and there is a general simi- 
larity of form. However, they can be distin- 
guished easily by the modification for the 
flexure of the large chela, as the merus is 
grooved in Neoalpheopsis and the chela is 
grooved in Jousseaumea\ by the pleura of the 
sixth abdominal segment which are articu- 
lated in Neoalpheopsis and not in Jousseaumea; 
by the telson, the posterior margin of which 
projects as a triangle in Neoalpheopsis but which 
is posteriorly cleft in Jousseaumea. The two 
can be distinguished further by the branchial 
formula which is 5-1-7 in Neoalpheopsis and 
5-1-8 in Jousseaumea. 
In all ways Neoalpheopsis shows a close rela- 
tionship to Alpheopsis Coutiere. The form of 
the carapace is similar in the two genera; the 
cephalic appendages are similar; the walking 
legs of the thorax are similar; the pleura of the 
sixth abdominal segment are similar. The che- 
lae and the telson differ, however. The chelae 
in Neoalpheopsis are carried folded back against 
the merus, the fingers are serrate or toothed, 
and the chelipeds are almost symmetrical; 
whereas in Alpheopsis the chelae are carried ex- 
tended, the fingers are usually without serra- 
tions, and the chelipeds usually have marked 
asymmetry. The telson in Neoalpheopsis pro- 
jects terminally to form a large and acute tri- 
angle, whereas in Alpheopsis the terminal mar- 
gin is either straight or slightly arcuate. 
TYPE SPECIES: Neoalpheopsis hiatti Banner. 
SPECIES OF NEOALPHEOPSIS 
1, Rostrum reaching to near middle of sec- 
ond antennular article; merus of third 
legs 4.5 times as long as broad 
N. hiatti (p. 21) 
Rostrum reaching only to distal third of 
first antennular article; merus of third 
legs 7.5 times as long as broad 
N. euryone (p. 25) 
Neoalpheopsis hiatti sp. nov. 
Fig. 6 a~l 
TYPE SPECIMEN: A male 13.5 mm. long 
collected from a head of coral in 20 feet of 
water, Hanauma Bay, Oahu. (Sizes and places 
of collection of paratypes listed below.) (U. S. 
N. M. 93452.) 
DESCRIPTION: Rostrum broadly triangular 
with tip reaching to initial third of second ar- 
ticle of antennular peduncle; rostrum slightly 
convex dorsally, with ventral keel. Orbital 
teeth broadly triangular with rounded tips; 
length 0.3 of rostrum. Carapace slightly in- 
flated over eyes. No pterygostomial angle. 
Eyes concealed in dorsal view; in lateral 
view slightly visible ventrad and anterior to 
margin of orbital hood. 
First antennular article 0.85 mm. long from 
base, with visible portion 0.30 mm. long; sec- 
ond article 0.30 mm. long; third article 0.40 
mm. long; all about 0.35 mm. in diameter. 
Stylocerite broadly acute, not spiniform, ex- 
tending to end of second antennular article. 
Internal crest of first article well developed, 
with acute tooth extending to end of article. 
