G. M. Tuomson.—On new Crustaceans. 287 
posteriorly into a tooth, which makes the palm nearly transverse, sparingly 
setose towards the extremity ; dactylos arcuate, nearly twice as long as the 
palm. First and second pairs of pereiopoda rather short, simple, and 
nearly destitute of spines or sete; third pair shortest of all, joints densely 
fringed with long sete, and the propodos strongly spined on ibs inferior 
margin ; fourth pair twice as long as third, dactylos directed backwards ; 
fifth pair longer still, being nearly equal in length to the whole body, the 
basa of these three last pairs are much dilated and setose on their margins. 
Three posterior pairs of pleopoda ending subequally, ante-penultimate and 
penultimate pairs with strong curved spines on their basal joints and rami; 
ultimate pair very small and feebly developed, with a few sete, but no 
spines, internal ramus very minute. Telson short and rounded at its extre- 
mity. Colour a dirty-grey, similar to that of the sandy-mud of the creek in 
which it occurred. Length j inch. 
Hab. Brighton Creek (salt water), near Dunedin. : 
This species is very distinct from any hitherto described, the form of the 
meros of the 2nd gnathopod being quite remarkable; a tendency towards a 
similar development of structure occurs apparently in C. longicorne, which 
is, however, a very different species in many respects. 
Fam. OXYCEPHALID/E. 
Genus Oxycephalus, Edw. 
Milne-Edwards, Ann. des Sc. Nat., t. xx., 1830, p. 396. 
C. Claus, Die Gattungen und Arten der Platysceliden, 1879, p. 44. 
Body elongated, slender, cephalon produced into a triangular beak, from 
the base of the under-surface of which the anterior antenne project. These 
have the peduncle greatly dilated in the male, and thickly furnished with 
olfactory sete; flagellum 2- or g-jointed. The posterior antenne are 5- 
jointed in the male, and lie behind the snout under the inflated portion of 
the head, all the joints being folded close against one another ; in the female 
they are wanting. The mandibles are small, and furnished with a slender 
8-jointed palp in the male. The maxille are totally wanting. The maxil- 
lipedes are also greatly reduced in size, and their squamiform plates are 
smoothly rounded. The gnathopoda have complex chele, the carpus being 
produced into a long narrow point, which meets the dactylos ; those of the 
first pair are shorter than the second. The first two pairs of pereiopoda 
have the joints very slender, in the third and fourth the basa are broadly 
dilated, while the fifth pair are very much. smaller, but have all the joints 
present. The three posterior pairs of pleopoda are double-branched, the 
‘branches being broadly lanceolate. The triangular telson seems to be 
anehylosed to the preceding segment. 
