OF NEW ZEALAND. 77 
the immobile finger more or less rudimentary, and spiniform. Second 
pair of legs with the wrist never annulated. Mandibles simple, 
usually slender and incurved. Sternum usually triangular, broader at 
base. 
RHYNCHOCINETES. 
Rhynchocinetes, M. Edw. Hist. Nat. Crust. ii, p. 882, (1837). 
Carapace of normal shape, rounded above. Rostrum very large, 
lamellate, compressed and articulated with the front. Hyes prominent, 
and when retracted downward, received into a cavity in the upper sur- 
face of the peduncle of the superior antenne. Inferior antenne with 
a very long and stout flagellum. External maxillipeds pediform, 
elongate, slender cylindrical. Abdomen convex and geniculated above 
as in Hippolyte. Anterior legs stout, with a well-formed hand, but 
with the immobile finger somewhat rudimentary. Second pair more 
slender, chelate, wrist not annulate, tarsi of the last three pairs very 
short. 
This genus was referred by M. Milne Edwards to his Palemoniens, 
and by Dana to the Alpheine. It appears to me that it has upon the 
whole more affinity with the Crangonida, different as it appears at 
first-sight from the typical form, on account of its large anterior legs, 
with the somewhat rudimentary immobile finger, the carpus of the 
second pair of legs which is never annulate, and the broad, triangulate 
sternum. The mandibles, though broad and stout, are not bilobed, 
82. Rhynchocinetes typus. 
Rhynchocinetes typus, M. Edw. Ann. Sci. Nat. (ser. 2) vii, p. 165, 
(1837); Hist. Nat. Crust. ii, p. 383, (1837); Gay, Chili, ii, p. 216, 
pl. i, fig. 7, (1849); Dana, U.S. Explor. Exped. xiii, Crust. part i, 
p. 568, pl. xxxvi, fig. 7, (1852). 
Carapace with four spines, three upon the front margin and one in 
the middle line, behind the median marginal spine. Rostrum very 
large, laterally compressed, upper margin with two distant teeth near 
its base, and seven or eight closely placed teeth at the extremity, lower 
margin with about twenty large teeth, External maxillipeds often 
longer than the rostrum, tipped with spines. Anterior legs large, 
fingers short, and rather spoon-excavate, hairy above, wrist with a 
