Alpheids from Onotoa — Banner 
159 
algae in which many animals live; some loose 
rocks, several feet across, under which most 
of the snapping shrimp were collected. 
A- 10-12. 450-600 feet from beach line, 
0.8-0.4-foot tide zone; about 70 per cent 
covered with shallow tide pools; substrate, 
algal covering, rocks similar to A-7; collecting 
of shrimp done at random in area wherever 
larger rocks occurred. 
B-4. On sandy lagoon beach, about 0.0- 
2.0-foot tide level, 400 to 1,000 feet from high 
tide line; snapping shrimp collected from 
heads of dead coral protruding above the 
sand beach. 
The following stations were those made by 
Dr. Cloud in which alpheids were collected: 
GOC-22. Station nearly in line with B-4 
above, 1,200 feet from shore, about 4-6 feet 
deep at low tide; substrate similar to B-4, but 
with more living and dead coral. 
GOC-28. Middle lagoon region, from reef 
patches from 6 to 14 feet deep. 
GOC-33. On outer edge of outer or west- 
ern reef growth ; depth from surface (low tide) 
to about 24 feet; flourishing coral growth. 
GOC-36. Across surface of outer or west- 
ern reefs; depth less than 6 feet; extensive 
coral growth separated by sandy areas. 
GOC-51. In pass through western reef 
front; collections from coral patches, mostly 
of living coral, rising from sandy bottom at 
15 feet to within 8-10 feet of surface. 
GOC-53. A pass similar to GOC-51, bot- 
tom at 18 feet, coral patches rising to within 
4 feet of surface. 
GOC-55. From deepest spot on lagoon, 
sounded at 50 feet; bottom sandy to muddy, 
with scattered low clumps of living and dead 
coral. 
Synalpheus Bate 
Synalpheus carinatus (de Man), 1888 
For synonymy see Banner, 1957. 
locality: 5 specimens from GOC-53. 
discussion: These specimens, from the 
same collection that yielded the obviously 
closely related S. consobrinus de Man, have not 
been assigned to any of de Man’s three sub- 
species. The subspecies were erected primarily 
upon the size of the ova, which were reported 
by de Man to be 0.4-0. 5 mm. long in one 
subspecies, 0.9-1. 0 mm. in the second, and 
1.2 mm. long in the third. Of these specimens, 
three were ovigerous with the egg diameters 
0.6 by 1.0 mm., 0.65 by 1.1 mm., and 0.65 
by 1.5 mm. It was also noted that the smallest 
eggs had the youngest embryos, while the 
largest had embryos near hatching. The other 
characteristics used by de Man in the separa- 
tion of the subpsecies are based on slight 
differences of variable characteristics, like the 
notch in the rostral carina, which in even 
these few specimens varied from well devel- 
oped to almost nonexistent. Without other 
less variable characteristics to base the differ- 
entiation upon, with this group of specimens 
showing marked variation in the size of the 
ova, and with poecilogony well known among 
the synalpheids (see Coutiere, 1899:444 etseq.) 
it appears that the division of the species into 
subspecies on these criteria is unrealistic. 
Synalpheus amboinae (Zehntner) 
Fig. 2 
Alpheus amboinae Zehntner, Rev. Suisse de 
Zool. 2: 202, pi. 8, fig. 23 a, b, 1894. 
Synalpheus amboinae de Man, Siboga Exped. 
39a 1 (2): 203, pi. 6, fig. 20, 1911. 
locality: 3 specimens at GOC-53. 
discussion: While these specimens are 
within the range of variation given by de 
Man (1911) and agree well with the descrip- 
tions of the species, they have been referred 
to this species with considerable doubts. 
They were collected at the same locality and 
at the same time as S. consobrinus de Man. 
These two nominal species differ in the pres- 
ence of a tooth above the articulation of the 
large chela, and in slightly different propor- 
tions and armature of the telson. With the 
difference in the size of the specimens re- 
ported by de Man, one would suspect that 
