FAUNA OF THE ALEUTIAN ISLANDS AND ALASKA PENINSULA 381 



ANOMURAN CRABS 



Dermaturus mandti was taken at three localities, and Oedi- 

 gnathus inermis and Placentron wosnessenskii each at one lo- 

 cality. 



OTHER CRABS 



Cancer magister, the large edible crab of commercial impor- 

 tance on the Pacific coast, was taken as far west as Tanaga Is- 

 land, and it probably occurs still farther west (fig. 9). Cancer 

 oregonensis is distinguished from the preceding species by its 

 hairy walking legs. Chionoecetes, Erimacrus, Hyas, Oregonia, 

 Paralithodes, Pugettia, and Telmessus are also represented in 

 the 1936-38 collection. Paralithodes camtschatica was taken for 

 food in the Bay of Islands by the ship's crew (fig. 10) . It is one of 

 the huge king crabs for which the Japanese have fished in re- 

 cent years in Aleutian waters. It seems to be restricted to certain 

 localities or to certain water conditions, for it was not found in 

 dredge hauls made at other stations along the islands. 



MOLLUSKS 

 BIVALVES 



The species of marine mollusks in the North Pacific are num- 

 bered by the hundreds. Only a few of the more conspicuous and 

 more readily obtainable species are represented in the 1936-38 

 collections. 



Bankia setacea, one of the shipworms or teredos, possibly may 

 be present, although only the calcareous tubes in driftwood were 

 collected (Unimak Island). 



Three members of the family Cardiidae were collected. 

 Clinocardium nuttalli, the giant cockle, is rather common and is 

 used for food by the natives. In digging the mollusk, a two-tined 

 potato fork bent like a hoe is raked through sand until it strikes 

 a solid object. It is said that the flesh makes good chowder, com- 

 parable in sweetness to that of the razor clam. 



Chlamys islandica, the scallop or pecten, was found in sea-otter 

 droppings and on the beaches of Ogliuga and Vsevidof islands. 

 Some shells are white, others are pinkish both inside and out. 



Two species of Liocyma were collected, one of which was hith- 

 erto undescribed (Bartsch and Render 1939). Liocyma is a com- 

 mon small white clam about 25 millimeters long; oval with fine 

 concentric rings ; occasionally greenish when living. It was noted 

 also on tideflats of the Alaska mainland. 



