Mollusks 23 A 



Genus Amicula Gray. 

 Amicula vestita Sowerby. 



Chiton vestitus Sowerby, Zool. Journ. IV, p. 368, 1829; Conch. 111., figs. 128, 

 128a, 1839. 



Amicula vestita Dall, Proc. U. S. Nat. Mus. I, p. 369, 1879; Sci. Results 

 Expl. of Alaska, p. 89, 1879. O 



Station 22, off cape Lisburne, Arctic ocean, in North Latitude 69 35' and 

 West Longitude 163 27', in 11-12 fathoms, rock and sand bottom. Also'found 

 in Bering sea northward from the Pribilof islands and on the Atlantic side from 

 the Arctic south to cape Cod on the American coast. 



NOTES ON THE LAND AND FRESHWATER MOLLUSKS. 

 By Mr. FRITS JOHANSEN. 



(Copied from Journal I.) 



Nome, Alaska: A few naked snails (Agriolimax hyperboreus) 1916. 

 and Succinea chrysis collected under loose stones, boards, etc., on A us ust25 - 

 tundra. 



Teller, Port Clarence, Alaska: A few snails (Succinea chrysis) 1913. 

 collected under old sacks, tins, etc., on tundra near the town. Jul y 31 - 



Teller, Alaska: Many fresh-water snails (Aplexa hypnorum) Augusts, 

 collected in brackish tundra-pond between the lake and the sea 

 near the town. 



Sadlerochit river, Camden bay, Arctic Alaska: Hot creek, November 

 tributary to Sadlerochit river, about 25 miles inland. On the free 6 ~ 7 - 

 (especially upper) sides of the submerged moss covered stones in 

 the creek bed were many small snails (Lymncea) attached in hundreds; 

 these snails besides other snails (Aplexa) and small clams (Pisidium 

 rotundatum) were also common between the grass on the sandy, 

 stone-free bottom of the creek in shallower water. 



Collinson point, Camden bay, Arctic Alaska: In a completely 1914 . 

 melted tundra-pond I collected a few fresh-water snails (Aplexa June 13. 

 with the soft parts black) on grass stems. 



Collinson point, Camden bay, Arctic Alaska: In a waterhole 1914.5 

 on the tundra I collected some smaller fresh-water snails (Aplexa June 20. 

 hypnorum, young) soft-naked part blue-gray, on grass stems. 



Collinson point, Alaska: In a waterhole in and near the beach, j u i y n. 

 I collected the common fresh-water snails (adult Aplexa). 



Konganevik, Camden Bay, Arctic Alaska: Many fresh-water June 25-6. 

 snails (Aplexa) collected in the littoral region of a big lake inland 

 among plants. Found about half a dozen about 15mm. long, black, J ul y 2 - 

 naked snails (Agriolimax hyperboreus) feeding on the pollen of 

 catkins of the common low willow (Salix sp.) in the coastal tundra 

 swamp. It was plainly to be seen that the snails really feed on 

 only the pollen, as the yellow anthers were missing or partly 

 missing on the catkins the animals were on, so that only the 

 red filaments were left. These snails had their creeping sole more 

 brownish; and the buccal mass when protruded, showed white, 

 dotted with black on the outer margin; otherwise the animal was 

 completely black. The moist weather during these days probably 

 brought these snails forth from their hiding-places under vegetation, 

 etc.; I tried to keep them alive, but a couple of days later they all 

 died. This is the first time I have found naked land-snails on the 



