46 



pair of anteriorly-curving horns, frontal lobe itself unarmed and somewhat de- 

 pressed; pseudorostral projection of moderate size, conically produced, horizontal; 

 subrostral corners distinct, obtusangular. Exposed part of trunk with small 

 scattered spinules forming dorsally a double row ; last segment with a median 

 spinule behind, lateral parts produced to comparatively short acute projections. 

 Tail (exclusive of the terminal appendages) somewhat shorter than the anterior 

 division, and clothed with numerous small spinules. 'Eye very small and imper- 

 fectly developed. Superior antennae rather slender, with the peduncle projecting 

 far beyond the tip of the pseudorostral prominence, its 1st joint somewhat shorter 

 than the other 2 combined, and coarsely denticulate along the outer edge and 

 at the end, last joint very slender, linear. First pair of legs considerably longer 

 than the carapace, basal joint not nearly attaining the length of the remaining 

 part, and rather spiny in its distal part, penultimate joint much longer than the 

 antepenultimate one, last joint comparatively short, not even attaining half the 

 length of the penultimate one; 2nd pair with the ischial joint produced below to 

 a strong spiniform projection, antepenultimate joint somewhat longer than the last 

 2 combined; 3rd and 4th pairs comparatively less robust than in D. Rathkei, 

 and having the basal joint coarsely denticulate behind. Uropoda exceeding half 

 the length of the tail, stem very narrow, rami more slender than in D. Rathkei, 

 and scarcely differing in length, being about half as long as the stem, outer 

 ramus with scattered short bristles outside, inner with the 1st joiiit shorter than 

 the other 2 combined, spinules of the inner edge about 10 in number (6 on the 

 1st, and 2 on each of the last 2 joints) apical spine very strong and forming the 

 immediate continuation of the joint. Telson not reaching quite as far as the 

 stem of the uropoda, its proximal third part of uniform width, cylindric, distal 

 part gradually tapering, with about 8 9 spinules on each side, apical spinules 

 somewhat longer than the lateral, and pointing straight behind. Colour greyish 

 white, with a yellowish tinge. Length amounting to 12 mm. 



Adult male. Body much more slender than in female, with the anterior 

 division considerably narrowed behind. Carapace very large and tumid, more 

 than twice as long as the exposed part of the trunk, and nearly smooth, having, 

 however, along each side a low, minutely serrated carina, joining, at about the 

 anterior 3rd part of the length of the carapace, an obliquely transverse plica 

 extending downwards ; the horn-like spines found in the female replaced by 2 very 

 slight tubercles; pseudorostral projection minutely denticulated on each side, and 

 having at the base 2 juxtaposed rounded protuberances, between which the eye 

 is, as it were, sunk ; subrostral corners produced in the form of rounded, coarsely 

 dentated lobes. Exposed part of trunk perfectly smooth above, lateral projections 



