1902.] ox THE CRUSTACEA OF THE '• SKEAT EXPEDITION." 363 



o. On the Crustacea collected during the '' Skeat Expedi- 

 tion" to the Malay Peninsula. By W. F. Lanchester, 

 M.A,, Kino's College, Cambridge \ 



[Received October 14, 1902.] 



(Plates XXXIV. & XXXV.'^) 



Part II.'— ANOMURA, CIRRIPEDIA, and ISOPODA. 



The species represented in the above-mentioned groups, in this 

 collection, number 35 (not including tlie land Isopods), comprised 

 in 20 genera ; of these 6 species are described as new, 2 among 

 tlie Anomura and 4 among the Cirripedia ; in addition to which 

 I liave given names, among the Anomura, to one colour-variety, 

 and, among the Cii'ripedia, to one subspecies and a colour- vai'iety 

 of that subspecies. In the latter case it will be seen that a single 

 form has been bvirdened with four names, a proceeding which 

 will not, I fear, find favour with many systematists ; I have, 

 however, given my reasons for so doing under the description of 

 the form in question, and will only say here that I have not 

 acted under any preconceived ideas on the general question of a 

 quadiinomial nomenclatui-e. liut rathei' from the exigencies of 

 the special case before me. 



Besides the marine Isopods herein described, there are in the 

 collection some 10 species of land Isopods ; many of these appeai-ed 

 to me, on examination, to be as yet undescribed. At the same 

 time it seemed to me advisable to have the opinion of a specialist 

 in this difficvilt group, and I thei'efore applied to M. Budde-Lund, 

 of Copenhagen, who very kindly undeitook to examine the 

 specimens, and who tells me that " several of them are not de- 

 scribed, but I have the descriptions and drawings laying by from 

 other collections." These .species, then, will be included by 

 M. Budde-Lund in a more general account of the land Lsopods 

 of the Malay Peninsula, to l)e published later on in these 

 ' Proceedings.' 



A. ANOMURA. 



I. Genus Petrolisthes Stimpson. 



1. Petrolisthes speciosus Dana. 



Porcellana speciosa I^ann, U.S. Exph Exp. p. 417. pi. xxvi. 

 fig. 8 (1852). 



Petrolisthes speciosus Ortmann, Zool. Jahrb. Svst. vi. p. 262 

 (1892). 



Loc. Pulau Bidan, Penang. A female. 



1 Comiaunicated by Dr. S. F. Haemee, F.Z.S. 

 , - For explaiiatifin of the Platos, see p. 381. 



■^ For l';irt I. see P. Z. S. 1001, vol. ii. p. .534. 



