488 Zoolocjical Society : — 



duced extremity of the propoJos. The three succeeding pairs of 

 pereiopoda are imperfect in the only specimen procured ; but the last 

 pair are long, cylindrical, slender, and terminated by a powerful dac- 

 tylos. 



This specimen was obtained in Esquimalt Harbour, and in its 

 habits and general distribution it is very similar to the preceding. 



Platycarcinus recurvidens, n. s. 



This very pretty species may easily be distinguished by the sharp 

 • points of the inner lateral teeth, granulated or minutely baccated 

 along the margin, and having the apex recurved. The intraorbital 

 margin is three -lobed and granulated, the central lobe being the 

 smallest. The dorsal surface of the carapace is granulated on the 

 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 antennae. 



The specimens were obtained in Esquimalt Harbour. It frequents 

 pools between tide-marks ; but Mr. Lord thinks it is common every- 

 where along the Oregon coast. 



Chlorodius imbricatus, n. s. 



Carapace having the posterior portion smooth, the anterior being 

 rough with flattened prominences that form an irregularly imbricated 

 surface. Anterior margin slightly baccated. 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.Petersbourg, 

 1849, vii. 1 7^ ; Stimpson, Crust. & Echin. of Pacific North America, 

 Journal of the Boston Soc. of Nat. Hist. vol. vi. p. 4/2, pi. 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 



