742 ME. W. F. LAJT0HS8TBB ON* CRUSTACEANS [June 10, 



Chelipedes .short, everywhere punctated, on the outside strongly 

 so as to appear almost rugose, on the inside faintly so as to appear 

 smooth in comparison. Merus trigonous, with a small double 

 blunt tooth, subdistal, on its upper margin ; carpus rounded, with 

 a small double tooth internally ; hand rather compressed, the 

 punctse, externally, tending to a linear arrangement; fingers 

 brown, rather short, dentate on the inner margin and externally 

 unisulcate; tips white and strongly excavate. 



The ambulatory legs are all carinated, in the following manner, 

 on their upper margins : the merus has a simple carina with a 

 slight groove on its outer aspect ; in the carpal joint this carina 

 is faintly sinuous, the groove is very distinct, and outside it may be 

 seen a second low carina ; this carina is even more distinct in the 

 fifth joint, until in the next it equals in size the first carina, and 

 the two enclose the original groove between them. Thus the 

 merus is unicarinate, the carpus obscurely bicarinate, and the 

 remaiuing t^vo joints distinctly bicarinate. 



The carapace and limbs in one female are of a deep red hue ; 

 in the males and the other female the limbs and under-surface 

 only are red or pinkish, the carapace being white or yellow-white. 



This form is identical with one which Mr. Uorradaile has re- 

 ferred to the genus Garpilodes ill a recent paper (supra, page 586) 

 and I too was at first inclined to refer it to that genus. But the 

 differences it exhibits are very striking, namely, the depression 

 of the carapace, the grooves on the subhepatic regions, the ridges 

 of the eudostome, and the carination of the ambulatory legs, while 

 the lateral margins are much less curved than in Garpilodes. This 

 combination of characters is also sufficient to separate it from 

 Actcea ; though I am inclined now to regard it as more nearly 

 related to that genus than to Garpilodes. 



Dim. 3 8-5 x 5-75. J 8'5x5'75. 2 7*75 x 5-5 $ 0-25x6. 



XXXII. Genus Actumnus Dana. 



51. Actumxus setifer de Haan. 



Cancer (Pilumaus) setifer, de Haan, Crust. Japon. p. 50, pi. iii. 

 f. 3 (18:30). 



Actumnus setifer, A. M.-Edvv. Xouv. Arch. Mus. t. i. p. 287, 

 pi. xviii. f. 5 (1865). 



Actumnus tomentosus, Dana, U.S. Expl. Exped., Crust, pt. i. 

 p. 213, pi. xiv. f. 2 (1852). 



Actumnus setifer, Miers, 'Alert ' Crust, pp. 225-6(1884); de 

 Man, Mergui Crust, p. 47 (1888) ; Walker, Journ. Linn. JSoc, 

 Zool. vol. xx. p. 110 (1887). 



Hub. Singapore; 5-10 fms. Five adult males and a smaller 

 female, and two young males. These were found in holes made 

 in soft stones, which were brought up by the dredge. 



Dim. 6 20-5x16. 6 16x13. J 13-25x10-5. rf 13-25 

 xlO-5. $ 13-75x10-5. $ 12-75x10. 



