OF CONCHOLOGY. 



201 



Binneya notabihs, Cp. The colored copies of Mr. Tryon's 

 Monograph represent the white mucous summer envelope as 

 colored, instead of the figure of the animal in motion. I made a 

 careful colored drawing of it when alive, which may yet be pub- 

 lished. 



Hyalina arhorea, Say ? Given in the Geograph. Catal., but 

 accidentally omitted in the Synopsis. Numerous specimens 

 found by Harford and Dunn at Clark's Ranch differ from New 

 York examples only in being slightly higher, and flatter beneath, 

 but the range of variation in this species is enough to include 

 them. I found a few in rotten stumps west of Johnson's Pass, 

 lat. 39°, at an elevation of 3650 to 5000 feet (this Journal, iv, 

 p. 226), but confounded them with H. Breiveri, supposing the 

 diiference due to difference of station, the latter living on sticks 

 in open swamps. 



Hyalina Breweri, Newc. Specimens found by me at Hunter's 

 Point, San Francisco Co., differ from the types from near Lake 

 Taho only in being smaller and flatter. Having found them in- 

 side dead shells of A. arrosa, I suspect that they sometimes de- 

 vour the dead animals of the large species. The Binneya, hav- 

 ing a shell like Testacella, may also be found hereafter in dead 

 snail shells.* 



Conulus fulvus, Drap. ? The specimens brought by Harford 

 from Ounalaska and Sitka were referred by Stearns to this in- 

 stead of 0. cliersinus, Say, supposing them the same. Midden- 

 dorf also calls it circumpolar, but I have none for comparison. 



PsEUDOHYALiNA Mazatlanica, Pfeiff. (Tryon.) 



Whorls 4, larger, smoother and less elevated than P. conspeeta, 

 Bid. Diam. 0-10, axis 0-03. (The larger diameter given by me 

 in the Synopsis belongs to this species.) My attention was first 

 called to the difference in the two by Rev. J. Rowell. Both 

 occur together in rotten oak stumps near San Francisco (Lone 

 Mountain). 



Ps. wiliu7n, Morse. Pronounced identical with his species by 

 Mr. Morse, though I could not detect "revolving grooves" in 

 our specimen with the highest magnifiers. 



*Hyalina pura, Alder, is given by Middendorf as circumpolar, but the 

 species has not yet been detected in Alaska as far as known. Vallonia 

 pulchella, Mull., is also given by him, perhaps confounding V. minuta. 

 Say, from the American side. The minute circumpolar genera may have 

 migrated from one continent to the other, but the higher Helicoids of the 

 temperate zone could not, during the present forms of the continents. 



