G. M. Taomson.—On New 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 sete 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. COROPHIIDA. 
Genus Iphigenia, n. gen. 
Pl. XVIIL., fig. 4. 
Body much depressed and flattened. Antenne short and thick, sub- 
equal. Coxe of the first 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 Jcillius, Dana, one of the 
most anomalous forms of the Corophiides. From this genus it is, however, 
at once distinguished by the very large coxe of the four anterior segments 
of the pereion, and by its short, thick, subequal antenne. 
1. I. typica,n.ep. 
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. Coxe of first four segments of the pereion quadrangular, much 
deeper than their respective segments, apparently projecting horizontally. 
Antenne 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 set ; inferior pair terminated by a short 5-jointed flagellum, and 
bearing numerous short sete#. Gnathopoda subequal ; propodos without a 
palm, dactylos simply unguiculate, and bearing a curved spine on its inner 
margin. First and second pereivpoda similar to the gnathopoda. Basa of 
the third pair very broad, of the succeeding 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. 
