PYCNOGONIDA 



CHAP. 



ten species, East Indies and Australia) ; Pallene grubii, Hoek 

 (Phoxickilidium sp., Grube, 1869), is probably congeneric. 

 Pallenopsis, Wilson (1881): appendage I. 2 -jointed; appendage 

 II. rudimentary, 1-jointed : appendage III. clawless ; auxiliary 

 claws present ; slender forms, including some formerly referred 

 to Phoxichilidium ; about fifteen species, world-wide. Pallene 

 <1 hno-rpha, Hoek, from TCerguelen, with 4-jointed palps, deserves 

 a new generic appellation. P. longiceps, Bohm, from Japan, with 

 rudimentary 2-jointed palps in the male, is also peculiar. 



Fam. 8. Phoxichilidiidae. Appendage I. well -developed ; 

 II. absent ; III. present only in the male, having a few simple 



A B 



Fi<;. 2S6.PhoijdcMlidiumfemoratum, Rathke, Britain. A, The animal with its legs 



removed ; B, leg and chela. 



spines iu a single row. The last character is conveniently 

 diagnostic, but nevertheless the Phoxichilidiidae come very near 

 to the Pallenidae, with which, according to Schimkewitsch and 

 others, they should be merged ; the two families resemble one 

 another in the single row of spines on the ovigerous legs and in the 

 extension of the cephalic segment over the base of the proboscis. 

 Pit u.'-.i't'/i ilidium, M.-E. (1840): appendage III. 5 -jointed ; five 

 or six species (Mediterranean, North Atlantic, Arctic, Australia, 

 Japan). Anoplodactylns, Wilson (1878): appendage III. 

 6-jointed; auxiliary claws absent or very rudimentary; about 

 species, cosmopolitan, of which many were first 



