BRACK YURA. 357 



Tlos havelocki, n. sp. Plate I, %. 2, and text-fig. 1. 



Locality : Coral reef's, Gulf of Manaar, one specimen. 



Description : An adult male. C.I. = 575 ; C.b. -5- C.I. = 1'48 ; Ch.l. -i- C.I. = 1'09 ; 

 arm 1. (inner border of under surface) -f- C.I. = 0*48 ; propus 1. (lower border) -j- C.I. = 0'61 ; 

 F.I. -S-H.1. (upper border) = 1'14. (Ch.l. is the sum of arm 1. and propus 1.) 



Carapace broadly pentagonal the front produced and strongly upturned and 

 having its anterior border flattened and a little emarginate in the middle line the 

 antero-lateral and postero-lateral angles of the pentagon are rounded the anterior 

 sides concave the lateral sides converge posteriorly a little the posterior side is 

 divided by two deep notches into three lobes which all project backwards to approxi- 

 mately the same level. The branchio -hepatic regions are concave and the post-cardiac 

 region deeply so. There are two marginal sutures on each side one 

 supra-orbital, the other about midway between this and the antero- 

 lateral angle. The margins of the carapace are a little thickened, a 

 little upturned and bordered by enlarged granules as far forward as 

 the more posterior pair of sutures between the latter and the supra- F . , ,, 

 orbital pair they are rounded and less distinctly granulated the frontal havelocki, n. sp. 

 margin is merely roughened. The true posterior border of the carapace 

 and the surface rising vertically above it are covered with enlarged granules. A 

 longitudinal ridge runs backward from the front to the cardiac region. The latter 

 is prominent and is crowned by a transverse ridge uniting the anterior ends of a pair 

 of very strongly developed, broad topped, granular ridges which run obliquely 

 backward to be continued into the lateral margins at the postero-lateral angles of the 

 pentagon. The rest of the dorsum of the carapace is smooth to the naked eye (seen 

 under lens to be uniformly covered by obsolescent granules). 



The pterygostomian region is prominent, its summit is forwardly directed and 

 surmounted by a couple of granules. The exposed portions of the thoracic sterna are 

 covered with enlarged granules the rest of the under surface of the body, i.e., 

 pterygostomian, sub-hepatic, and sub-branchial regions, is smooth to the naked eye 

 (obsolescently granular under lens). 



The orbits are largely ventral. The eyes are visible in part only, in a dorsal view. 



Antennules not remarkable. 



External maxillipedes with exposed surface roughened ; not remarkable in form. 



Chelipeds Ch.l. -r C.I. = 1*48. The distal end of the arm is seen beyond the 

 carapace (arm 1. -j-C.l. = 0'47). The arm is trigonal, with enlarged granules along its 

 borders its surfaces are* smooth to naked eye (obsolesceutly granular under lens). 

 Wrist rounded its borders and much of its surfaces granular. Hand with outer and 

 inner borders granular under surface rounded and bearing granules which tend to 

 run iii rows, of which one curves downwards and outwards from the inner side of the 

 proximal end to be continued along the whole under surface of the propus to the tip 



