eae 
CRUSTACEA OF THE MERGUI ARCHIPELAGO, 273 
the larger hand is armed at its distal end, above the articulation 
of the mobile finger, with a short acute spine. The first joint of 
the carpopodite of the second legs is even a little longer than the 
four other joints together, the second, third, and fourth joints are 
very short and of equal length, the fifth is nearly as long as 
the third and the fourth taken together; the hands are scarcely 
longer than the last two joints of the carpopodite taken together, 
the palm being a little shorter than the fingers and a little shorter | 
also than the terminal joint of the wrist. The inferior margins 
of the meropodites of the legs of the third pair are armed with 
four or five spinules along their distal halves; the meropodites 
also of the legs of the fourth pair present one to three similar 
spinules in the middle of their inferior margins, but the meropo- 
dites of the last pair of legs are unarmed. The dactylopodites 
of the legs of the last three pairs are biunguiculate, the acute 
claw being armed on its upper or external margin with a second, 
much smaller claw. 
Alpheus minor, var. neptunus, has been hitherto collected in 
Japanese and Chinese Seas (Island of Ousima, Hongkong), 
in the Sooloo Sea (Dana), at Port Jackson (Hastern Australia), 
in the Red Sea (Suez), and at Ceylon, so that this variety 
appears to be distributed throughout the Oriental Seas. 
151 6. ALPHEUS MINOR, var. BIUNGUICULATA, Stimps. 
Alpheus biunguiculatus, Stimpson, Proc. Acad. Nat. Sci. Philad. 1860, 
p. 3l. , 
Three other specimens collected at Sullivan Island are doubtless 
examples of Alpheus biunguiculatus, Stimps., viz.: an adult ova- 
bearing female and two small males. The female specimen is 
21 millim. long. In these specimens the claws of the last three - 
pairs of legs are biunguiculate, as in A. neptunus, but differ from 
it in the smaller claw being placed on the under or internal side of 
the larger, and by the inferior margins of the meropodites of the 
legs of the third and fourth pairs being unarmed. The other 
characters of A. biungwiculatus mentioned by Stimpson are wholly 
absent in these specimens or only partially present. Thus the 
upper margin of the palm of the larger hand in two speci- 
mens (the adult female and one male) is unarmed, but in the 
third specimen (the small male) it is armed at its distal end with 
a spine similar to that found in A. neptunus. The joints of 
LINN. JOURN.— ZOOLOGY, VOL, XXII. 18 
