1900.] FROM SINGAPORE AND MALACCA. 743 



XXXIII. Genus Pilumnus Leacb. 



52. Pilumntts vespertilio Pabr. 



Cancer vespertilio, Pabr. Suppl. Eat. Syst. p. 338 (1798). 



Pilumnus vespertilio, M.-Edw. Hist. Nat. Crust, t. i. p. 418 

 (1834). 



Pilumnus ursulus, Ad. & White, ' Sanaarang ' Crust, p. 45, pi. ix. 

 f. 6 (1848). 



Pilumnus mus, Dana, U.S. Expl. Exped., Crust, pt. i. p. 240 

 (1852). 



Pilumnus vespertilio, de Man, Mergui Crust, p. 58 (1888) ; 

 Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 (1887). 



Hah. Singapore ; littoral. One large male, four smaller ; a 

 small female, and a very young male. The granulations of the 

 under surface of the larger hand tend to disappear in the largest 

 male (cf. de Man, t. c). 



Dim. cf 24-5x19. cf 13x10. cf 10x7. cf 10x7. 

 cf 8-5x6-5. 2 10x7-5 



53. Pilumnus labtrinthicus Miers. 



Pilumnus labyrinthitis, Miers, ' Alert ' Crust, p. 224, pi. xxii. 

 f. C (1884) ; Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 

 (1887); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 365(1893). 



Hah. Singapore ; 5-15 f'ms., rough bottom. Two adidt females 

 and three very young males. 



Dim. $ 12-5x10. $ 9x7-25. cf 5 x 6. 



54. Pilumnus minutus hirsutus. 



? Pilumnus minutus, de Haan, Crust. Japon. p. 50, pi. hi. f. 2 

 (1839). 



Pilumnus hirsutus, Stimpson, Proc. Ac. Nat. Sci. Philad. p. 37 

 (1858); Hasw. Cat. Austr. Crust, p. 69 (1882). 



Pilumnus minutus'?, var. hirsutus, Miers, ' Challenger ' Brachvura, 

 p. 154 (1886). 



Hob. Singapore ; littoral, from broken stones and coral. One 

 larger male, damaged, and two smaller. 



I agree with Mr. Miers in thinking it very probable that de 

 Haan's P. minutus is nearly identical with P. hirsutus of Stimpson. 



Dim. cf 9x7. cf 6x4-5. cf 4-5x3-5. 



55. Pilumnus l^tis Dana. 



Pilumnus Icevis, Dana, Conspectus Crust., Proc Ac Nat. Sci. 

 Philad. vol. vi. p. 82 (1852) ; de Man, Mergui Crust, p. 06, pi. iv. 

 ff. 1-2 (1888) ; id. Zoolog. Jahrb. Bd. viii. p. 553 (1895). 



Hah. Singapore ; ? depth. A small male. 



The infra-orbital margins may be seen to be finely granulous 

 under the lens, but there is no hiatus just under the outer orbital 

 angle on the right side ; as in Dr. de Man's somewhat larger 



