196 DE. C. CHILTON ON THE SUBTERRANEAN 



Tlie uropoda (fig. 13) arc long, the peduncle as long as the inner ramus, and reaching 

 considerahly beyond the end of the telson. Its lower margin is straight and bears three 

 tufts of setae on the proximal portion and another tuft at the extremity ; the upper 

 surface is flat or slightly concave, the outer margin with a few small setae scattered 

 along the whole length ; the inner margin with few setae, except towards the end, 

 where it is somewhat raised and bears two stout spiniform setae on the projection. The 

 outer ramus is considerably shorter than the inner, but of the same shape ; each is 

 lanceolate, a little constricted at the base, and bears numerous tufts of one or two stout 

 setae and many fine hairs ; the extremities narrow somewhat abruptly and are free 

 from setae. 



Male reproductive organs. I came across the male reproductive organs in the 

 specimen from which I was dissecting out the appendages. They seem to have the 

 same general shape as in Asellus aquaUcus [91, pi. x. fig. 7], but there appears to be a 

 great number of the oval cnl-de-sacs, apparently five or six. The vas deferens was quite 

 crammed with spermatozoa, which resemble those of Asellus. 



I have been unable to find an external male organ in either of the two specimens I 

 possess. 



Phreatoicus ttpicus, Chilton. (PL XVIII. figs. 1-12.) 



Phreatoicus typicus, Chilton, New Zealand Journal of Science, vol. i. p. 279 (Nov. 1882) ; id. Trans- 

 actions New Zealand Institute, vol. xv. p. 89, plate iv. ; Thomson & Chilton, Transactions New 

 Zealand Institute, vol. xviii. p. 151; T. R. R. Stebbing, Report on the 'Challenger' Amphipoda, 

 pp.513, 587; R. Moniez, " Faune des eaux souterraincs du departemeut du Nord &c.," extrait de 

 la Revue Biologique du Nord de la France, tome i. (1888-1889), p. 53. 



Specific diagnosis. Body somewhat slender. Pleura of the second, third, fourth, and 

 fifth segments of the pleon moderately produced, not deeper than their respective 

 segments ; their inferior margins well supplied with setae, especially in the fifth 

 segment. Extremity of the telson forming a narrow projection much longer than 

 broad, narrowing distally, the truncate extremity tipped with rather long setae. Lower 

 antennte about three-fourths as long as the body ; flagellum much longer than the 

 pedvincle, which is slender and has the fifth joint twice as long as the fourth. Legs 

 slender; joints scarcely expanded, the first four pairs not very abundantly supplied with 

 setae. Lower lip with each half subtriangular, with the inner distal angle somewhat 

 acute. Inner lobe of the first maxilla broad, expanded distally, and bearing about nine 

 long plumose setae. 



Colour. Translucent. 



Length. Rather more than half an inch (15 mm.). 



Habitat. Eyreton {Chilton) and Ashburton (W. W. Smith), in wells. 



Detailed Description. 



Unfortvmately I have no male specimen of this species, all the few specimens I liave 

 seen, about ten altogether, being females. The following detailed description applies 



