24 DE. W. T. CALMAN ON NEW OE EAEE 



is a little more than one-third of the length of the subequal rami. There are three 

 plumose setae and three spini;les on the inner edge of the en doped and a minute seta 

 on the inner edge of the peduncle. 



A younger specimen, 3-7 mm. in length, agrees with that described above in the form 

 of the carapace. 



Bemarks. — The specimens described above, though immature, differ so much from 

 the species hitherto described in the shape of the frontal region of the carapace, 

 in the great length of the first pair of legs, and in the stellate texture of the integument, 

 that there can be no doubt of their specific distinctness. 



Occurrence. — Gulf of Siam, " Between Koh Mesan and Koh Chuen, 15 fathoms," 

 and " Between Koh Mesan and Cape Liant, 8 fathoms." Th. Mortensen Coll., Copen- 

 hagen Museum. 



EoctTMA PRODUCTA, sp. n. (Plate VI. figs. 18-20.) 



Description of immature Female. — Total length 4-6 mm. 



Carapace a little over one-quarter of the total length, flattened and with well-marked 

 lateral carinae. The greatest width, across the lateral cornua at a little behind the 

 anterior third of the carapace, is a little more than half the length. The lateral cornua 

 are not very prominent, with the tips directed forwards. The postero-lateral edges 

 are slightly convex. The width of the posterior margin is nearly two-thirds of that 

 measured across the cornua. The pseudorostral lobes are rounded and very prominent, 

 projecting far in front of the antero-lateral teeth, Avhich are small and blunt. Between 

 the antero-lateral tooth and the lateral cornu the margin is straight. The dorsal surface 

 is slightly arched and is without distinct median or dorso-lateral keels. The transverse 

 ridge on the underside is faintly marked. The ocular lobe is longer than broad and 

 the pseudorostral plates meet in front of it for a distance greater than its length. The 

 eye is not pigmented. The integument is thin and transparent and minutely reticulated. 



The antennules were not dissected out, but they have the peduncle rather elongate, 

 the last segment being about four times as long as broad. 



The first legs are rather short, extending but little beyond the pseudorostrum. The 

 basis is four-fifths of the length of the distal segments together. The carpus is a little 

 shorter than the propodus and a little longer than the dactylus. 



The basis and ischium of the second legs have several teeth on the inner edge. 



The uropods are longer by nearly two-thirds than the last somite. The peduncle is 

 less than one-third of the length of the subequal rami. The inner edges of the peduncle 

 and of the proximal half of the endopod are beset with plumose setae and the distal 

 half of the endopod carries two spinules. 



Bemarks. — The specimen described above is distinguished from all the species of 

 which the females are known by the narrow carapace and the very prominent pseudo- 

 rostrum. In general shape it shows some resemblance to the much larger male 



