CU.MACEA FEOM THE COPENHAGEN MUSEUM. 23 



that of the young specimens of E. taprobanica (t. c. pi. i. fig, 5). I believe, however, 

 that the present species is sufficiently distinguished by the greater breadth of the 

 carapace and by the presence of two dorso-lateral keels, since these cliaracters are not 

 likely to be greatly modified in the adult. E. Idlgendorji, which also possesses dorso- 

 lateral keels, can hardly be the adult stage of the present form, since it has the antero- 

 lateral teeth greatly produced, while, from the analogy of E. taprobanica, we should 

 expect these teeth to become less prominent as development proceeds. 



Occurrence. — Gulf of Siam, " Koh Kam, 5-10 fathoms," " Between Koh Mesan and 

 Cape Liant, 5-8 fathoms." Th. Mortensen Coll., Copenhagen Museum. Co-types in 

 British Museum. 



EocuMA STELLiPERA, sp. n. (Plate VI. figs. 13-17.) 



Desorij)tion of immature Female. — Total length 5"6 mm. 



Carapace little more than one-quarter of the total length, very broad and flattened, 

 with well-marked lateral cariuae. The greatest width, across the lateral cornua at about 

 the anterior third of the carapace, is about eight-ninths of the length. The lateral 

 cornua are rather stout and incurved at the tips. The postero-lateral edges are slightly 

 concave. The width of the posterior margin is about two-fifths of that measured across 

 the cornua. The pseud orostral lobes are not very prominent ; each is rounded at its 

 inner end, then concave, and what may be regarded as its outer end forms a low rounded 

 tooth over the base of the antennule. External to this, and separated from it by a 

 concavity of the margin, is the antero-lateral tooth, which is acute and produced for- 

 wards a? far as the level of the frontal lobes. Between the antero-lateral tooth and the 

 lateral cornu the margin is nearly straight. The dorsal surface is slightly arched 

 and has a slight median keel posteriorly. Paired dorso-lateral keels are also present, 

 but are not so marked as in E. lata. On the underside the transverse ridge is much 

 as in E. lata. The ocular lobe is broader than long and the pseudorostral plates meet 

 in front of it for a distance greater than its length. The eye is not pigmented and no 

 corneal facets were observed. The surface of the carapace is closely beset with shallow 

 pit?, and the meshes of the primary reticulated texture of the exoskeleton are arranged 

 in a more or less regular radial manner around each pit. Under a moderate magnifi- 

 cation the carapace appears covered with stellate clear spots. 



The proportions of the abdomen are much as in E. lata. 



The antennules have the first segment of the peduncle longer than the other two 

 together and the third longer than the second. 



The first legs are very long and slender. The distal segments are about two and a 

 half times as long as the basis. The latter has its distal process very long and acute 

 and directed obliquely inwards. The carpus is one-quarter longer than the propodus 

 and more than twice as long as the dactylus. 



The uropods are little more than one-third longer than the last somite. The peduncle 



