G. M. Thomson. — On Neiv Zealand Crustacea. 237 



posterior pairs broader and more hirsute ; third pair shortest. Posterior 

 pleopoda having the rami subequal and densely fringed with hairs at their 

 extremity. Telson having each division slightly hollowed out at the apex, 

 with the inner edge acutely toothed, and two setae springing from the 

 hollow. 



The integument is of a remarkably horny consistence. 



Colour yellowish. Length 0-5 inch. 



Hab. Only two specimens of this very distinct species were taken in 

 the dredge in Port Pegasus. I have named it in honour of my fellow- 

 worker and companion on the cruise, Mr. D. Petrie. 

 Fam. COROPHIID^. 

 Genus Iphigenia, n. gen. 

 PI. XVIII., fig. 4. 



Body much depressed and flattened. Antennse short and thick, sub- 

 equal. Coxae of the fii-st four segments of the pereion very large, those of 

 the succeeding segments small. Basa of the three pairs of posterior pereio- 

 poda dilated. Gnathopoda simple, unguiculate. Three posterior pairs of 

 pleopoda very small, curved inwards, with minute simple rami. Telson 

 single, entire. 



The very remarkable Crustacean (Amphipod) for which this genus has 

 been formed, appears on first inspection to be an Isopod. It is only after 

 closer examination that it is seen to be allied to Icillius, Dana, one of the 

 most anomalous forms of the Corophiides. Prom this genus it is, however, 

 at once distinguished by the very large coxae of the four anterior segments 

 of the pereion, and by its short, thick, subequal antenna. 



1. 1. typica, u. sp. 



Segments of the pereion and part of the pleon slightly ridged on the 

 dorsal median line, and produced upwards into tubercles. Cephalon pro- 

 duced forward laterally into acute lobes in the angles of which the eyes are 

 placed. Coxae of first four segments of the pereion quadrangular, much 

 deeper than their respective segments, apparently projecting horizontally. 

 Antenna hardly more than one-sixth as long as body : superior pair with 

 the basal joint broad, flagellum very short, about 4-jointed, and furnished 

 with long seta ; inferior pair terminated by a short 5 -jointed flagellum, and 

 bearing numerous short seta. Gnathopoda subequal ; propodos without a 

 palm, dactylos simply unguiculate, and bearing a curved spine on its inner 

 margin. First and second pereiopoda similar to the gnathopoda. Basa of 

 the third pair very broad, of the succeeduig pairs narrower. Pleon narrow- 

 ing posteriorly. Three last pairs of pleopoda with thick, styliform rami ; 

 ultimate pair with a row of tooth-like spines on its upper surface. Telson 

 about as broad as long, nearly semicircular, quite entire. 



