Species of the A inphipodan (7en<is Cyproidia. 213 



Ci/proiiiid ota/ccnsi'.s, sp. n. (PI. V.) 



Specijic description. — Ccphaloii \vit!i a very small Itluiit 

 rti.stral picjoctioii ; first two scfjjtuonts of pereion short, 

 third and tburth niucli loii<^er, fourth longer than the third; 

 last three segments of pereion and first three segments of 

 ploon subequal in len-^th ; fourth segment of pIcon fully as 

 long as the third, but much narrower, it bears throui^hout its 

 length a distinct dorsal crest, which widens posteriorly and 

 projects beyond the end of the following segment, ending 

 acutely; fifth segment very short, oidy about one fit'lh the 

 length of the fourth, sixth segment longer than the fifth ; 

 telson reaching to the extremity of the peduncle of the 

 terminal uropods. Gnathopoda subequal ; carpus of the 

 second longer than that of the first, and in both produced 

 distally along the underside of the proj»odos; j)ro|)odos of the 

 second rather the stouter, palm not well defined in either. 

 Basa of first and second pereiopoJa narrow, not expanded; 

 those of third, fourth, and fifth all expanded in a thin flat 

 plate with rounded posterior margin. Kami of terminal 

 uropoda unequal, upper margins fringed with {mo, setaj and 

 a few stouter sjjinules at intervals. 



I olour light brown. 



iSlze. Length of body about 3 millim. 



Jlah. Otago Harbour, New Zealand. A few specimens 

 obtained by surface-netting. 



In addition to the above brief diagnosis, I give here the 

 following additional details : — 



The (jeneral shape of the body will be best seen from the 

 figure ; the side-plates of the first and second pereio|)oda are 

 enoimously developed, and the anteniuc, appendages, and 

 pleon can nearly all be concealed and protected by them. 

 'J he side-plate of the first pereio{)od extends forwards past 

 the first two short segments of the pereion and fits closely 

 along to the lower margin of the cephalon ; its junction with 

 the side-plate of the second pereiopod is siimous, the two are 

 accurately and closely fitted, but are not actually cemented 

 together, and can be readily separated by dissection. The 

 side-plate of the second {)creiopod is slightly deeper and con- 

 siderably broader than that of the first ; its margin is regu- 

 larly convex below and behind, but is excavated at the upper 

 posterior corner for the reception of the fairly well developed 

 side-plate of the third pereiopod. 



The cephalon is rather longer than the first segment of the 

 pereion, the rostrum small and indistinct. The eye is large 



16* 



