664 MR. C. SPENCE BATE ON NEW CRUSTACEANS. [Dec. 13, 
prominent lobes in the larger specimens, but almost smooth in the 
young. The first pair of pereiopoda have also lines of granulations 
along the outer surface of the propodos and carpus. 
Dana has merged this genus into that of Cancer; but the greater 
length of the animal in relation to its breadth is a very convenient 
generic diagnosis, and one that appears to correspond with Milne- 
Edwards’s description relative to the more longitudinal position of 
the two pairs of antenne. 
The specimens were obtained in F'squimalt Harbour. It frequents 
pools between tide-marks; but Mr, Lord thinks it is common every- 
where along the Oregon coast. 
CHLORODIUS IMBRICATUS, N. 8. 
Carapace having the posterior portion smooth, the anterior being 
rough with flattened prominences that form an irregularly imbricated 
surface. Anterior margin slightly baceated. Antero-lateral margin 
five-toothed, the central tooth being the largest, the posterior the most 
prominent. A small secondary tooth stands upon the anterior surface 
of the fourth and fifth teeth. The first pair of pereiopoda are short 
and robust ; they have the carpus deeply corrugated upon the external 
surface, so also the propodos; the dactylos is ribbed upon the upper 
surface ; a slight rib is also present upon the carpus of each of the 
four succeeding pairs of pereiopoda. 
Only a single specimen of this pretty little species was obtained. 
It was dredged in about eight fathoms of water in Esquimalt Harbour. 
CRYPTOLITHODES TYPICUS. 
Cryptolithodes typicus, Brandt, Bull.del Acad. de St. Pétersbourg, 
1849, vii. 175 ; Stimpson, Crust. et Echin. of Pacific North America, 
Journal of the Boston Soc. of Nat. Hist. vol. vi. p. 472, pl. 20. 
A specimen of this species, which was first described by Brandt, 
and afterwards more fully, as well as figured, by Stimpson, was taken 
in Rosario Strait, Vancouver Island, as well as in Upper California. 
The male, which has not hitherto been described, differs from the 
female in being less produced posteriorly, The posterior margin, 
instead of being projected in an arch inversely corresponding with 
that of the anterior margin, traverses a line that is nearly direct from 
side to side, slightly posterior to the points of the broadest diameter 
in the carapace. The pleon is triangular, and smaller and narrower 
than in the female, having the lateral margins more straight and 
symmetrical. 
The only male specimen in the collection is smaller than the female, 
and the surface generally more tuberculated. Theright propodos of the 
first pair of pereiopoda is larger than the left, and is so well deve- 
loped as scarcely to be capable of being folded within the limits of 
the carapace. ‘The length of the male animal, from the extremity of 
the rostrum to the centre of the posterior margin of the carapace, is 
about ?ths of an inch; its breadth, from the point of one lateral ex- 
tremity to the other, is about 17 inch. 
