CUMACEA PEOM THE GOPENHAGElSr MUSEUM. 357 



together about equal to the first segment. The outer flagellum has a minute terminal 

 segment. 



The mandibles, maxillulse, maxillfe, and first maxillipeds appear to differ in no 

 conspicuous characters from those of N. unguiculatus. The second maxillipeds have 

 the basis only about one and a half times as long as broad ; the basal plate carries 

 seven setse. 



The third maxillipeds have no exopods ; the basis is less than one-third of the total 

 length of the limb ; the distal segments are relatively very stout. 



The first legs also are without exopods. The basis is not more than one-quarter of 

 the total length of the limb. 



The second legs have no exopods. The basis is not inflated and is little shorter 

 than the remaining segments together. The distal segments are broad, the carpus is 

 hardly longer than the merus, and the broad dactylus is not twice as long as the 

 propodus. 



The remaining legs increase slightly in length to the last pair, which are about two- 

 fifths of the total length of the body ; the basis is a little over one-fourth of the length 

 of the limb, the carpus is not three times (in the third pair it is less than twice) as 

 long as the merus and a little shorter than the propodus. 



The uropods have the peduncle about two-thirds as long as the last somite, with two 

 small teeth on the inner edge. The endopod is about twice as long as the peduncle, 

 with a stout terminal spine of about half its length and with three minute spines and 

 a small seta on the inner edge. The exopod is less than one-fifth as long as the 

 endopod, with a slender terminal spine which reaches nearly to the end of the latter. 



Remarks. — ^This species differs from that last-described in the form of the carapace 

 (which has the branchial regions less inflated and the anterior part of the dorsal surface 

 more strongly arched), in the greater length of the posterior legs, and in the different 

 proportions of the uropods. It differs more remarkably in the absence of exopods from 

 the legs of the first and second pairs, in which respect it resembles the species described 

 below as N. tardus. 



Occurrence. — Gulf of Siam, " Koh Kahdat, about 1 fathom, coral, i.-ii./OO," " Koh. 

 Chang, 1 fathom, coral, i.-iii./OO." Th. Mortensen Coll., Copenhagen Museum. 

 Co-types in British Museum. 



Naknastacus minor, sp. n. (Plate XXXIV. figs. 1-3.) 



Description of adult Female. — Total length 1-3 mm. 



Carapace not quite two-fifths of total length, little broader than deep. Pseudo- 

 rostrum very short and truncate, the two parts meeting in the middle line below the 

 respiratory orifice. Antero-lateral margin deeply concave, the antero-lateral corner 

 produced and triangular. Eyes prominent and darkly pigmented. Surface of carapace 

 not very uneven, the branchial regions only slightly inflated, with a depression between 



VOL. xviii. — PART IV. No. 3. — February, 1911. 3 c 



