332 On the Amphipodous Crustacea of New Zealand. 



appendage ; flagellum very indistinctly 7-8-jointed : inferior 

 pair very strong, about as long as body ; second and third 

 joints with spines on their anterior margins ; fourth and fifth 

 joints long ; flagellum indistinctly three-jointed, the first joint 

 being equal to the two succeeding. Mandibles with an ap- 

 pendage, the basal joint of which is much the shortest. 

 Maxillipeds with appendages to the basos and ischium ; dac- 

 tylos spatulate. First gnathopoda with simple cilia on 

 their inferior margins ; carpus produced inferiorly into a 

 rounded lobe ; propodos narrowing anteriorly, palm very ob- 

 lique, defined by three or four stout spines ; dactylos strong, 

 curved and acutely toothed on its inner margin. Second 

 gnathopoda large and powerful, furnished with numerous 

 plumose hairs, which are particularly abundant in two rows 

 on each side of the palm ; basos hollowed out in front so as 

 to receive the upperside of the propodos ; meros acutely pro- 

 duced on its infero-posterior margin ; propodos articulating 

 on the upper margin of the carpus, oblong, that of the left side 

 slightly the larger and having the teeth more prominent on 

 its upper margin ; palm extending along the whole under 

 surface, with two or three denticulations ; dactylos long, curved, 

 and smooth. Pereiopoda subequal, fifth pair rather the 

 longest ; setse numerous and strong, not exceeding the dia- 

 meter of the articulations to which they are attached. Telson 

 conical, tipped with a few slender setee. 



Female differs from the above only in the greater width of 

 the pereion, and in having the second gnathopoda relatively 

 smaller, rounder, and wanting the plumose cilia. Length 

 •25 inch. 



Hab. Dredged along with the preceding species in Dunedin 

 Harbour in 4-5 fathoms, among Sertularice and seaweeds. 



This species differs from the generic characters of Cyrto- 

 phium in possessing an appendage on the superior antennas ; 

 but as it agrees in every other respect, I do not feel justified 

 in placing it in a new genus. It comes nearest to C. brasi- 

 liense, obtained by Dana in the harbour of Rio Janeiro. 



EXPLANATION OF PLATE XVL 



Fig. 1. Amphithonotus Icevis J, magnified. 



Fig. 2. The same : cephalon, showing the rostrum, x 14. 



Fig. 3. The same : mandible, with its appendage, X 56. 



Fig. 4. The same : telson, seen from above, X 14. 



Fig. 5. Mierodeutopus maculatus $ , magnified. 



Fig. 6. The same: telson and posterior pleopoda, x28. 



Fig. 7. The same : mandible and appendage, x 28. 



Fig. 8. The same : maxillipeds, X 28. 



