MONOGRAPH OF THE LEUCOSIADA. 285 
line around the posterior margin. There is no trace of the thoraeie sinus. External foot- 
jaws extending quite to the extremity of the front, the anterior portion slightly granu- 
lated, and the external stalk (palp) with the margin slightly curved. The sternum in 
each sex is bordered anteriorly with a line of distinct granulations. Abdomen of the male 
with the sides parallel to within one-third of the extremity, the remainder triangular, 
with a strong projecting tooth. The anterior legs twice as long as the breadth of the 
carapace ; the arm above covered with granulations for about half its length, the remainder 
quite smooth ; wrist rounded, perfectly smooth; hand half as long again as it is broad, 
slightly flattened, without any carina or granulations; the fingers long, curved, meeting 
only at the points, and furnished with a few distant teeth. 
Length of the carapace 0:9 in. 
Several specimens of this species from Australia exist in my own collection and in the 
British Museum. 
LEUCOSIA PALLIDA, mihi (Tas. XXX, fig. 2). Fronte tridentato, ultra orbità producto; 
sinu thoracico in sulco brevi profundo anticè terminato, granulis paucis supra inser- 
. tionem pedum anteriorum ; mänibus utrinque subcarinatis omnind lævibus ; digitis 
inermibus. 
Hab. in mari orientali. Mus. Brit. 
Carapace contracted anteriorly, rounded and very convex behind ; front tridentate, pro- 
jecting beyond the orbits; latero-anterior margin waved, granulated ; hepatic region 
slightly elevated; posterior margin projecting ; thoracic sinus terminating anteriorly ina 
deep hollow, in which are a few large granulations just above the insertion of the anterior 
legs. Abdomen as in L. affinis. External pedipalp smooth in the male; a slight projec- 
tion on the middle of the inner stalk in some females. Anterior legs of moderate length j 
arm granulated on the upper surface, excepting an oval space on the distal — uf 
length ; the under surface with all the middle and anterior portion smooth ; wrist s M 
rounded, and smooth ; hand longer than it is broad, slightly carinated on each a h - 
out any granulations ; fingers meeting at the anterior third of their length, without any 
ek ee marbled with a somewhat darker hue; four whitish spots on the 
_ anterior part of the carapace, and two dark ones behind. 
Length of carapace 0°8 in. 
Several specimens of this 
the Voyage of the Samarang. PU | . 
In ipia colour it is very different from any other; but it has the four anterior pale 
and the two posterior dark spots which prevail 80 BEER in this genus. 
Levcosta opscura, mihi (Tas. XXX. fig. 3). Testa mere scd ate en. 
producto, minutè tridentato; sinu thoracico ua ; Bean gi s 
quam latioribus, utrinque carinatis, non granulatis ; digitis in : 
Hab. ad insulas Philippinas. Muss. Brit., Bell. 
Carapace suborbicular, front tridentate, 
pretty species are in the British Museum, obtained from 
the middle tooth the longest ; margin granu- 
2P2 
