20 DR. W. T. CALMAJST ON NEW OR EAEE 



Genus Eocuma. 



I have discussed the characters and the limits of this genus in a former paper 

 (Herdman's Eep. Ceylon Pearl Fisheries, Royal Society, pt. ii. (1904), Suppl. 

 Rep. xii. Cumacea, p. 160). The material now examined reveals the existence 

 of a number of closely allied species. Unfortunately they are represented, for the 

 most part, by immature and sometimes damaged specimens, and it is only after some 

 hesitation that I describe the four new species which follow, leaving aside for the 

 present solitary and more or less imperfect specimens of three species, which may 

 be distinct, from Aden, Trincomalee, and Penang respectively. 



The new species have the lateral margins of the carapace carinated and the pseudo- 

 rostrum projecting in front of the lateral cornua, and they therefore come under the 

 division A. 1 in the key to the genus which I gave in my previous paper (t. c. p. 161). 

 This part of the key may be extended as follows to include them : — 



a. Antero-lateral teetli of carapace low and rounded (female) or absent 



(male) ; no paired ridges on dorsal surface. 



a . (Male.) Cornua of carapace small, directed forwards; autero-lateral 



margin strongly convex ; peduncle of antennule not elongated . E. taprobanica Caiman. 



b' . (Male.) Cornua of carapace prominent, directed obliquely out- 

 wards ; antero-lateral margin only slightly convex ; peduncle 

 of antennule much elongated E, longicornis, sp. n. 



b. Antero-lateral teeth more or less prominent, acute. 



a'. Carapace nearly as broad as long, with paired dorsal ridges; 

 autero-lateral teeth reaching nearly or quite as far forward as 

 the pseudorostruni. 

 a" . Frontal margin with a small tooth on each side between the 



pseudorostral lobe and the antero-lateral tooth E. steUifera, sp. n. 



b" . Frontal margin without a tooth between the pseudorostral lobe 

 and the antero-lateral tooth. 

 «'". Antero-lateral teeth acutely produced, directed obliquely 



outwards E. hilyendorfi Marcusen. 



b'" . Antero-lateral teeth obtusely triangular, with acute spini- 



form points directed forwards E. lata, sp. n. 



b' . Carapace hardly more than half as broad as long, without paired 

 dorsal ridges ; antero-lateral teeth not reaching nearly as far 

 forward as pseudorostrum E. productn, sp. n, 



EocDMA LONGICORNIS, sp. n. (Plate VI. figs. 1-6.) 



Description of adult Male. — Total length 7*65 mm. 



Carapace little more than one-quarter of the total length, its greatest width, 



