BKACHYURA. 397 



This new genus bears considerable resemblance in general appearance to the genus 

 Zozymus ; the sculpture of its carapace and chelipeds, and its cristate walking legs, 

 are reminiscent of Zozymus ceneus. It presents, however, many points of difference 

 from that genus. 



These differences concern : ( 1 ) Plane of the posterior half of the dorsal surface of 

 the carapace ; (2) antero-lateral borders of the carapace ; (3) direction in which the 

 folded antennules lie ; (4) antero-exterhal angle of the basal anteunal segment ; (5) 

 shape of anterior part of merus of external maxillipeds ; and (6) finger tips. 



The form of the antero-lateral borders of the carapace is, moreover, a point of 

 difference from ALCOCK'S description of the Alliance in which he places Zozymus, i.e., 

 Alliance Zozymoida (see A. 3, p. 77) ; the character of the walking legs is a link with 

 this Alliance. The sub-orbital continuation of the antero-lateral borders of the 

 carapace, and the production of the outer angle of the basal antennal joint into the 

 orbital hiatus, are links with the Alliance Euxanthoida. The pentagonal form of the 

 carapace is a point of similarity to the Alliance Halimedoida. (See NOBILI for figure 

 of Halimede hendersoni N., p. 123, pi. vi., fig. 31.) 



Demania splendida, n. sp. Plate I., fig. 8, and Plate II., fig. 1. 



Locality : Trincomalee, a single non-ovigerous, but probably adult, female. 



Description : Carapace roughly pentagonal, with prominent deeply notched front 

 and rounded epibranchial angles ; the antero-lateral borders are convex, the postero- 

 lateral borders concave, the posterior border slightly concave. 



The general surface is convex fore and aft ; it is also convex from side to side 

 quite obviously so in the hepatic regions, only slightly so in the branchial regions. 

 The regions are well delimited by pubescent grooves, and are themselves broken by 

 similar grooves into numerous lobules ; the latter are more numerous and more 

 distinctly demarcated in the posterior half; in the anterior half they are often more or 

 less confluent, the separating grooves dying away. The lobules are all smooth and 

 polished, and the grooves are found on removal of the pubescence to be smooth. The 

 carapace has thus a general resemblance to that of Zozymus ceneus. 



The front is considerably produced and deeply divided to form two prominent 

 bluntly pointed lobes ; at the base of the outer border of each of the latter the outer 

 angle of the front is produced as a distinct, blunt, forwardly directed tooth. Frontal 

 breadth -j- C.I. = 0'31 ;" length of frontal lobe (inner border) -f- frontal breadth = 0'27. 



Orbital border smooth. Upper border has tumid inner portion. There are three 

 fissures one a little to outer side of the middle point of the upper border, the other 

 two are in the neighbourhood of the outer angle, one above and one below. The inner 

 orbital angles, both upper and lower (the latter a blunt tooth), are prominent ; the 

 intervening hiatus receives only a narrow projection of the outer angle of the basal 

 antennal segment. 



Antero-lateral border of carapace rounded; the actual edge shows a slight sharpening, 



