492 CRUSTACEA. 



outer antennae stands. The inner antennse have a globular base. 

 Posterior to the orbit, there is an abrupt tuberculiform projection, 

 which is not seen in an upper view, and not below, without removing, 

 or moving to one side, the anterior legs. The abdomen has a very 

 short penult joint ; and the last or caudal segment is nearly semicir- 

 cular ; the caudal lamellae are single either side and long ciliate. The 

 hand is somewhat gibbous above, with the fingers rather more than 

 half the whole length. The tarsi are depressed styliform, and are 

 edged along either margin with a few short setae or hairs. 

 The species are nearly identical in all their characters. 



MONOLEPIS ORIENTALIS. 



Sterni segmenta fossam sterni includentia anterior margine interiore fere 

 truncata; segmenta proximo, parce convexa, non tuberculigera. Tkiber- 

 culus medianus inter aream buccalem et fossam sterni simplex, subtri- 

 angulatus antice acutus, postice hemisphericus. Tarsus pedum 5torum 

 styliformis, apice 3 setis tarso longioribus arnatis, infra 4 setulis per- 



The first of the sternal pieces bordering the sternal fossa truncate at 

 inner margin, this and the following without tubercles. The 

 median sternal tubercle between the buccal area and the sternal 

 fossa triangular, with the triangle pointing forward and rounded 

 behind. Posterior feet having the tarsus short, not unguiculate, 

 having three long setae at apex, and below, four very short hairs, but 

 no spines. 



Plate 31, fig. 5 a, animal, enlarged four diameters ; b, carapax ; c, 

 under view ; d, front view of front ; e, outer maxilliped ; /, extremity 

 of second pair in profile ; g, extremity of fifth pair. 



Sooloo Sea. Collected, Feb. 3, 1842. 



Length of carapax, four lines. Body obese, and much convex. The 

 depression of the carapax for receiving the posterior legs, abrupt and 

 deep, with the margin prominent. Surface of the carapax in its 

 anterior half, with seven punctures forming an arc convex forward, 

 also, more posteriorly, two punctures and a reticulate structure ; in 



