32 



well-developed oval "epipod," the margins of which are 

 fringed with long setae. 



The uropods are similar to those of other species of 

 Phreatoicus, having the basal joint subequal in length with 

 the branches, its upper margin fringed with stout setae, the 

 upper margin of each branch being similarly fringed. 



Ajflnities. — Until it is possible to make a revision of the 

 Phreatoicidea this species may be left' under the genus 

 Phreatoicus. It shows a good general resemblance to P. 

 australis., but differs markedly from that species, and indeed 

 from all the members of the tribe, in the absence of the coxal 

 joints of the peraeopoda. It resembles P. australis in having 

 the first peraeon segment short and more or less fused with 

 the head, in this character agreeing also with Phreatoicopsis 

 terricola, Spencer and Hall. It agrees with the latter species 

 and differs from Phreatoicus australis in the fact that the 

 fourth peraeopod is not specially modified in the male. The 

 sixth segment of the pleon, although fused with the terminal 

 segment, or telson, appears to be more distinctly mark'^d 

 off from it by a distinct suture than in the other species; in 

 Phreatoicus australis there is a suture present, but this ex- 

 tends anteriorly only a short distance from the base of the 

 uropod and does not reach the posterior margin of the fifth 

 segment. In most Isopods, except the Anthuridae, the sixth 

 segment is completely fused with the telson without any 

 apparent suture to indicate the line of juncture. 



I am greatly indebted to my assistant, Miss E. M. 

 Herriott, M.A., for preparing the drawings for this paper, 

 and to Professor F. Wood Jones for the opportunity of 

 describing this interesting species. 



List of References. 

 Barnard, Keppel H. 



1914 — 1. Contributions to the Crustacean Fauna of South 

 Africa. 2. Description of a New Species of 

 Phreatoicus (Isopoda) from South Africa. Ann. 

 South African Mus., vol. x, pp. 231-240, pis. 23 

 and 24. 

 Caiman, T. W. 



1909 — Crustacea, in Ray Lankester's Treatise on Zoology, 

 part vii., Appendiculata, 3rd Fascicle. 

 Chilton, C. 



1894 — The Subterranean Crustacea of New Zealand, with 

 some general remarks on the Fauna of Caves and 

 Wells. Trans. Linn. Soc, Zool., vol. 6, pp. 

 163-284, pis. 16-23. 



