CET7STACEA OF XEW ZEALAND. 221 



three times as long as the peduncle, the inner branch rudimentary. Telson about half 

 as long as the terminal uropoda, narrowing slightly towards the extremity, which bears 

 two stout setfB. 



Colour. White, semi-transparent. 



Length. About 8 mm. 



Sabitat. Eyreton {Chilton) and Leeston {R. 11. Laing); Canterbury (in wells). 



Bemarks. Moniez says [78, p. 50] that this species differs little from Crangonyx 

 subterraneus, Spence Bate. Bate's description of that species is, however, not sufficiently 

 detailed to allow of a comparison of any value between the two. 



Detailed Descrijition. 



Bochj (PL XX. fig. 1.). The body is rather stout and deep, especially in the pleon. 

 The side-plates {co.xcb) are about half as deep as their respective segments, and are all 

 nearly equal in size. The head is as long as the first segment of the perseon ; segments 

 of perteon subequal, the posterior ones a little longer than those preceding them. First 

 three segments of the pleon subequal, a little longer than the last segment of the peraeon, 

 about twice as deep as long; inferior margin of each segment slightly convex and 

 furnished with four or five setnc, arranged chiefly toAvards the anterior end ; last three 

 segments of the pleon very short. 



Eyes rudimentary, represented by two or three imperfect lenses without pigment. 



Tlpxier antennm (figs. 2 & 3) considerably longer than the lower, about one-third 

 the length of the body ; peduncle slightly shorter than the flagellum ; first joint nearly 

 as long as the second and third together, upper margin straight and furnished with a 

 few minute spinules, lower surface grooved, bearing on the inner margin three stout 

 setae, the third being at the distal end, the outer margin without setge, winged, produced 

 downwards at the base, where it is slightly convex ; the second joint half as long again 

 as the third, a few fine setne on both upper and lower margins, those at the extremity 

 being longest and most numerous ; third joint similar to the second except in size. 

 Secondary appendage small, reaching to about the end of the second joint of the main 

 flagellum, consisting of two joints, the first as long as the first joint of tlie flagellum but 

 very slender, bearing ordinary sette ; the second small, bearing ordinary set;e and a minute 

 olfactory cylinder at the extremity. Flagellum consisting of about thirteen joints, those 

 at the base nearly as broad as long, the others becoming more and more slender, each 

 joint from the second onwards bearing on the loAver side of the distal extremity two 

 olfactory cylinders nearly as long as the succeeding joint, and two small tufts of ordinary 

 setse, one above, the other below. 



Loicer antennce (fig. 4) having the first two joints very short, the gland-cone 

 arising from the second joint being very long and reaching nearly to the end of the 

 lower margin of the third joint ; third joint subquadrangular, with two stout setae in 

 the middle of the upper margin and one long simple seta at the extremity of the lower 

 margin; fourth joint only half as broad as tlie third, upper margin bearing a stout seta 

 near the base, foUowed by two or three slender setae, lo\\ er margin with thi'ee oblique 



29* 



