Thomson. — On New Zealand Crustacea. 265 



tinct ; those of the 5th, 6th, and 7th segments distinct, and 

 with their exterior margins produced backwards. 



Abdomen about 4nim. long ; the rest of the body being 

 11mm. ; 2nd segment rather indistinct ; hxst segmeiit as long 

 as the first five segments of body, and ending in a deep semi- 

 circular notch. The operculum is crossed by a tra,usverse line 

 about one-third of the length from the extremity. 



External antennae thick and pediform, as long as the 

 cephalon and three succeeding segments ; peduncle 4-jointed, 

 flagellum 2-jointed, joints diminishing in length towards the 

 end. Internal antenna? reaching to the end of the second 

 joint of the external pair ; peduncle 3-jointed ; liagellum with 

 one long joint, ending in a very short joint and a tuft of setae. 



Length, 15mm. ; the ratio of length to breadth being as 

 11 to 1. 



Colour brown, with minute black punctations. 



116. Jcera nco-zealanica, Chilton. 



This species, Mr. Chilton informs me, is identical with 

 Dana's Ja;ra -puhcsccns, from Tierra del Fuego. The descrip- 

 tion and figure of that species, however, leave this identifica- 

 tion somewhat doubtful. Meanwhile C. Bovallius* separates 

 those species with tri-unguiculate dactyla into a new genus 

 lais, of which the following is the generic character: — 



Genus lais, Carl Bovallius. 



" Body depressed, elongate. Head rounded, not rostrate. 

 Eyes small, consisting of very few ocelli. First pair of 

 antennae few-jointed. Second pair longer than half the body, 

 with multi-articulate flagellum. Mandibles provided with a 

 3-jointed palp. Lateral margins of the pereional segments 

 scarcely produced, not covering the bases of the legs. Pereio- 

 poda subequal, walking legs ; dactyli pedunculated, 3-uuguicu- 

 late. The uropoda consist of thick cylindrical peduncles, and 

 two elongate laminate rami." 



lais neo-zcalanica, Chilton. 



Numerous specimens of this species were taken b}' me 

 between tide-marks in Auckland Harbour. 



118. Janira longicauda, Chilton. 



This species differs from Janira and allied genera suf- 

 ficiently, in the opinion of Carl Bovallius, to be separated 

 into a new genus lathripi)a,\ of which the following is the 

 character : — 



* " Notes on the Family Asellidfe " (" Bihang till K. Svenska Yet.- 

 Akad. Handlingar," band ii., no. 15, p. 50). 

 t hoc. cit., p. 31. 



