Hawaiian Crangonidae — Banner 
25 
Neoalpheopsis euryone (de Man) 
Fig. 7 a-g 
Alpheopsis ? euryone de Man, Ned. Dierk. Ver., 
Tijdschr. (2), 11(4): 308, 1910. 
Alpheopsis ? euryone de Man, Siboga Exped. 
39aH2): 184, pi. 5, fig. 19, 1911. [This de- 
scription is more available, more complete, 
and is provided with plates.] 
Rostrum triangular, acute, tip extending 
over 0.7 of length of visible portion of first 
article of antennular peduncle. Rostral base 
and rostrum without dorsal keel, not distinct 
from gradual curvature of carapace; rostrum 
with ventral keel. Orbital teeth strongly re- 
duced, hence frontal border of carapace lateral 
to rostrum almost straight in dorsal view; apex 
of slight teeth rounded. No pterygostomial 
atigle. 
Eyes concealed in dorsal view, partially vis- 
ible in lateral view. 
First article of antennular peduncle 0.74 
mm. long; second 0.44 mm. long and as broad 
as long; the third 0.37 mm. long. Stylocerite 
broad, tip acute, reaching more than 0.7 length 
of second article. Inner flagellum 8.5 mm. 
long; outer 7.3 mm. long, with secondary fla- 
gellum reaching over 1 mm. from base of fla- 
gellum. 
Lateral angle of basicerite produced and 
truncate [however, as in the specimen avail- 
able, it ends in such abrupt truncation on both 
sides that it may have had a strong and acute 
tip broken off.] Scaphocerite broad, flat, al- 
most as long as antennular peduncle; lateral 
spine shorter than rounded portion. Carpoc- 
erite of antenna extending only to middle of 
last article of antennular peduncle; flagellum 
15.3 mm. long, extending to fifth abdominal 
segment. 
Third maxilliped lacking, 
Chelipeds quite symmetrical in develop- 
ment, over 11 mm. long from base, capable of 
being folded back against merus. Ischium 
similar to N. hiatti. Merus 3.4 mm. long, 0.6 
mm. broad, with diagonal longitudinal exca- 
vation accommodating propodus when ap- 
pendage is flexed; inner and outer inferior 
distal corners of merus project slightly as 
rounded teeth. Chela proper 5.4 mm. long, 
1.3 mm. broad (3 times as long as broad), 1.1 
mm. thick, oval in cross section. Palm smooth 
without ridges or depressions. Fingers 2.0 mm. 
long; fixed finger with narrow crest along in- 
ner face, with 11 teeth; ridge depressed distad 
of teeth, then produced as small crest with 
poorly defined teeth; apex curved, strong, 
acute. Dactylus similarly with narrow crest, 
but knife-like except for small portion in mid- 
dle with feeble teeth, bidentate crest opposite 
depressed area on fixed finger, knife edge 
diminishing to acute, curved tip. Cheliped 
glabrous except for several setae near end and 
sparse row of short stiff bristles along knife 
ridge of dactylus. Palmar and digital adhesive 
plaques poorly developed. 
Second legs 6.8 mm. in total length. Carpal 
articles with ratio 10 : 1.9 : 1.7 : 1.7 : 3.8. 
Third legs slender and elongate, 7.8 mm. 
long. Ischium 1.5 mm. long, with 2 movable 
spines on inferior surface. Merus 2.2 mm. 
long, 0.29 mm. broad (7.6 times as long as 
broad), with 2 movable spines on inferior 
edge. Carpus 1.4 mm. long, without spines or 
teeth. Propodus 2.0 mm. long, with 4 mov- 
able spines. Dactylus long and slightly curved, 
0.7 mm. long, 0.09 mm. broad, with 2 tufts 
of bristles on convex surface. 
Articulated pleura of sixth abdominal seg- 
ment well developed, triangular, with free cor- 
ner acute. 
Telson 2.95 mm. long, 1.17 mm. broad at 
base, 0.48 mm. broad at tip. Anterior portion 
strongly convex dorsally, but posteriorly al- 
most flat; lateral margins almost straight. Pos- 
terior margin produced as large triangle, 0.25 
mm. broad at base and 0.29 mm. long, with 
straight sides and acute tip. Two pairs of ter- 
minal bristles, inner slightly shorter than tri- 
angle (0.28 mm. long), outer about 0.3 as long 
as inner. Triangle with 4 pairs of setose bris- 
tles. First pair of dorsal spinules of telson 0.4 
distance from base (1.1 mm.); second pair 
about 0.7 of distance from base (1.9 mm.). 
