CEUSTACEA OF NEW ZEALAND. 233 



tiropoda ; there is a strong spine on the body-segment just at their base. The peduncle 

 is considerably longer than the rami ; its lo\yer margin straight or slightly curved, upper 

 surface broad, concave ; both inner and outer margins supplied with about six small 

 spines, a large spine nearly half as long as the inner ramus being situated at the 

 extremity of the inner margin. The outer ramus is slightly longer than the inner ; 

 upper margin with three small spines, a large one and two small ones at the extremity ; 

 inner ramus similar, but with two large spines at the extremity. 



The second uropoda (fig. 23) are small, not reaching to the end of the peduncle of 

 the third uropoda. Peduncle stout, about as long as the rami, concave above, both 

 inner and outer upper margins with two or three spines ; outer ramus slightly shorter 

 than the inner, upper margin with three small spines, a large one and two small ones 

 at the extremity ; inner ramus with its upper margin supplied with about twelve small 

 spines arranged closely in a row, two large ones and two or three short ones at the 

 extremity. 



The third uropoda (fig. 24) are very long, nearly as long as the whole pleou. The 

 peduncle, is rectangular, about three times as long as broad, two setae on the side near 

 the lower margin ; upper surface slightly concave ; both inner and outer margins with 

 spines, two or three at the extremity of the outer margin and one large one at the 

 extremity of the inner margin. The two rami of equal length, nearly twice as long as 

 the peduncle, each cylindrical, scarcely tapering towards the end ; outer surface of each 

 with five groups, each containing three spines ; inner surface with five similar groups of 

 stout spines, and in addition a number of long plumose hairs ; extremity of each with 

 about six or seven spines of various lengths. 



In fig. 24' the last urojioda are represented as usually seen, the outer row of setse 

 being shown on the outer ramus and the inner row with the plumose hairs being seen 

 on the inner ramus, which is somewhat twisted round. The spines or setae on these 

 uropoda arc shorter in proportion to the appendage in large specimens, and this is the 

 case also with the spines on the legs and in other parts of the body. 



The telson (fig. 25) is short, reaching only slightly beyond the base of the pedimcle 

 of the last uropod. It is cleft right to the base, each half being more or less rectangular ; 

 the outer margin curved, extremity straight or slightly rounded, bearing on the inner 

 half fovu- long spines about half as long as the telson, and towards the outer side two or 

 three similar spines situated a slight distance from the extremity. 



The above description applies to fully developed females. I am not able to say 

 whether the males differ from the females in the last pair of uropoda. as in Niphargus, 

 but the numerous specimens that I have seen and closely examined all agree with the 

 description given above. 



Genus Cai/Liopius, Leach. 



(Bate & Westwood, Brit. Sessile-eyed Crust, i. p. .259.) 



Of this genus Bate and Westwood give only the following as the generic character : — 

 *' Like Pherusa, except that at least the second pair of gnathopoda have the propodos 



