27 327 



Misc. Coll., XLIX, 138, pi. XVII, fig. 4), by the wider front, narrower posterior margin, 

 and by the spine on the merus joints of the legs. 



Acmæopleura rotunda Rathbun. 



Acmœopleura rotunda Rathbun, Proc. Biol. Soc. Washington, XXII, p. 109, 1909. 



Carapace about as long as broad, subcircular, a little convex, widest at the 

 middle; fronto-orbital distance not much less than width of carapace; front about 

 one-third width of carapace, bilobed with a shallow sinus and separated from the 

 inconspicuous orbital angle by a slight furrow. Eyes stout, filling the orbils. Outer 

 angle of orbit not advanced. Lateral margin acute. Surface of carapace and cheli- 

 peds rough with granulations. 



Antennules obliquely folded. Antennæ very slender, as long as the major 

 diameter of the orbit. Epistome short, well defined. Buccal cavity widening a 

 little anteriorly, with the anterior angles rounded off. Outer 

 maxillipeds not gaping, the endognath very wide, merus and 

 ischium subequal in length and width, but much wider than 

 long; the inner half of the anterior margin is occupied by a 

 notch, and the palpus articulates at the middle of the margin. 

 Exognath narrow. I'ig- i«- MaxiUiped 



Chelipeds of moderate size, inner margin of wrist rounded, ° cinœop eura ro- 



•^ ° tunda, type d" juv., 



fingers meeting, tips crossing and curved inward. The right i-tô mm. wide. 



cheliped in the single specimen is much reduced, probably ab- 

 normally so. Legs narrow, unarmed; first three pairs subequal, fourth pair much 

 smaller; last three joints subcylindrical, dactyli very slender and moderately curved. 



Length of male 2 mm., width 175 mm., fronto-orbital width 17 mm., width 

 of front ü'7 mm. 



Type locality. - South of Koh Kut, 17—20 fath., mud; I. 28; 1 (j* juv. 



I am not sure that this species should be included in Acmœopleura, not having 

 seen a specimen of A. parvula Stimpson (Smithson. Misc. Coll., XLIX, 130, pi. XI, 

 fig. 4), or a figure of its maxillipeds. The carapace of A. paroula, according to 

 Stimpson's figure, is widest in the anterior half, and the legs are not so slender 

 as in our species. 



Subfamily Sesarminæ. 

 Sesarma (Sesarma) tæniolatum White. 



Sesarma tæniolatum Alcock, LXIX, 419, 1900. 



Mangrove swamp, Lcm Ngob ; XII. 23, 24 & 27 ; 2 c? juv. 1 ? juv. Coast of 

 Lem Ngob, — 1 fath., stones and sand; XII; 1 c? juv. 



Sesarma (Sesarma) minutum de Man. 



Sesarma minuta de Man, Arch. f. Naturg , LUI, pi. 1, 377, pi. XVI, fig. 4, 1887. 



Fishing-weir at Koh Kong; I. 21; 1 c?. Koh Chang, 1 fath., coral; I— III; 4c? 



4 ? (2 ovig.). 



42* 



