204 



Eyes pigmented. Coxopodites of walking legs dorsally with 



pectinated processes C. gramilosaMcGWchnst.'). 



I. Ceratoplax ciliata Stimpson. PI. ii, Fig. 2. 



Literature: AlcoCK, Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 320. 



Rathbun, K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n" 4, 1910, p. 342. 



Stat. 162. West coast of Salawatti, near northwest New Guinea. Depth 18 m. i cf . 



The specimen rather well agrees with Alcock's description and with Miers' figure ") 

 (the diagnoses, if anyone is given, of Walker and Cano, cited by Alcock, could not be consulted 

 by me), but it is considerably larger than that of Miers, whose specimen was only 8.5 mm. 

 broad and 6.5 mm. long. 



The carapace is much arched longitudinally, especially in its anterior part, and straight 

 transversely. Towards the margins it is covered with short hairs, like the subhepatic and 

 subbranchial regions, but the central parts of the carapace are smooth. There is a trace of a 

 cervical groove, situated far backward, and at either end of this an irregular depression, covered 

 with very short hairs, forms the most conspicuous marking of the carapace ; there is further a 

 transverse hairy line behind the front and the surface of the latter is obscurely divided by a 

 short longitudinal sulcus. 



The front is deflexed ; its free edge regularly arched (fig. 2^:), but not notched in the 

 middle in my specimen, as Alcock states; across its surface a transverse row of long hairs 

 is to be observed, and this row is continued on the supra-orbital margin and further laterally 

 and backward along the antero-lateral margins of the carapace. The eye-stalks are piriform, the 

 eyes distinct, but in dorsal view of the animal nothing is seen from the eye, as this is chiefly 

 developed on the ventral side of the eye-stalk; its pigment is of a dark sepia tint, not black. 

 The antero-lateral margins of the carapace are regularly arched and divided into three portions 

 by two faint notches ; the subparallel postero-lateral margins are much more obsolete and somewhat 

 granulate, and at the transition between the anterior and posterior part the carapace reaches 

 its greatest breadth, which is 1.3 times its length; the posterior margin is somewhat wavy, 

 slightly conve.x in its middle part. 



Antennulae folded transversely beneath the front. Antennae very short, peduncle free, 

 not fixed to the front or to the inner orbital lobe. Epistome distinct. Lateral margins of buccal 

 cavern greatly convergent backward. External maxillipeds broad, antero-external angle of merus 

 conspicuously produced outward, exognath about half as broad as ischium, which latter is 

 longitudinally grooved in the middle, about 17, times as long as broad, and slightly narrower 

 than the merus. 



Chelipeds subequal, bulky, but shorter than the walking legs. Meropodite short, mostly 

 smooth, but granulate towards the borders ; upper border with a row of long hairs, which row 



1) Ann. Mag. Nat. Hist. (7), v. 15, 1905, p. 263; Alcock & Mc Gilchrist, 111. Zool. "Investigator" Crust, prt 11, 1905, 

 pi. 74, f. 2. Hab. Gulf of Martaban, 61 fathoms. s , t- , v 3, 



2) Rep. "Challenger", Brachyura, 1886, pi. 19, f. 3. 



56 



