CRUSTACEA OF THE MERGUI ARCHIPELAGO. DANG: 
the teeth of the fingers of the left chelipede are not developed. 
The chelipedes of the second pair are everywhere smooth and 
unarmed. The three other legs are slender, unarmed, and closely 
resemble those of Harpilius inermis, but the carpopodites are a 
little shorter in proportion to the length of the propodites, and 
the small curved claws (fig. 10) are armed with a small acute tooth 
at their inner margins, as in the genus Coralliocaris, Stimps. 
(= Gidipus, Dana). 
The uropoda perfectly agree with those of Harpilius mermis, 
Miers, reaching a little beyond the distal end of the terminal 
postabdominal segment, and being armed with a curved spine 
above at their bases. The rami are ovate, ciliated, and the outer 
are a little broader than the inner. 
The larger of our two specimens, the ova-bearing female, is 
26 millim. long from the tip of the rostrum to the end of the 
terminal postabdominal segment, the carapace (with the rostrum) 
measuring 9 millim. The larger chelipede of the second pair is 
17 millim. long, the hand measuring 9% millim., the palm 6 millim., 
the fingers 3¢ millim. 
Genus HirpponyTE. 
154. HipponyrEe oLigopon, n. sp. (Plate X VIII. figs. 1-6.) 
The collection contains one male specimen of a species of 
Hippolyte which appears to be new; this I now propose to 
describe under the name of olzgodon, on account of the small 
number of teeth with which the rostrum is armed. This speci- 
men was found at Elphinstone Island; but, unfortunately, it is 
somewhat mutilated, having lost a part of the flagella of the two 
pairs of antenne, and also some legs. 
The rather slender animal is about 28 millim. long, from the ‘tip 
of the rostrum to the end of the terminal postabdominal segment, 
the postabdomen measuring 19 millim. This species seems to be 
most allied to Hippolyte spinifrons, M.-EKdw., from New Zealand ; 
but may be distinguished from it at once by the ordinary size of 
the antennal spine on the anterior margin of the carapace, which 
is small and does not even reach to the middle of the eye- 
peduncles. In Hippolyte oligodon, as in Hippolyte spinifrons, 
the postabdomen is straight and not deflexed in the middle, 
whilst in most other species of this genus it is suddenly 
geniculated downwards. The rostrum is spiniform, small, and 
