54 Mullani Bld. Wh. 5½ to 6, brownish corneous, microscopic spiral lines and tubercles; (hairy?) diameter *0.53, axis 0.29.
55 loricata Gld. Wh. 5½, brown or greenish, scale-like wrinkles quincuncially arranged; diam. *0.25 to 0.35, axis *0.10 to 0.20.
I am indebted to Dr. Newcomb and Mr. R. E. C. Stearns for much assistance in preparing this paper. Though not offered as a final arrangement of the species, it is hoped that this synopsis may aid in their determination, and thus make a step towards a correct systematizing of this difficult series.
There are four or five other subgenera among the 50 species of this family in the Atlantic States, divided by Bland into fifteen groups. He places Nos. 51, 54, and 53 in his 8th, 9th, and 15th groups respectively.—(Ann. N. Y. Lyc. N. H. 1864.)
[32] Extreme specimens of H. arrosa found by Mr. Gabb in Mendocino County, Cal., its northern limit, and also one of H. redimita found in Alameda County by Mr. Holder, have exactly the form of H. pomatia, and in each case have one and a half whorls less than the types, indicating perhaps that the usual forms found here are higher developed than the type of the genus. (A genus Pomatia has also been founded on this type of the Linnæan genus Helix.)
Aglaia was used by Escholtz, 1825, in Acalephæ, by Swainson, 1827, in Birds, and by Renier Philinidæ, before Albers adopted it in this order!!
[33] See, also, the “Geographical Catalogue of West Coast Mollusca,” published by the State Geological Survey, April, 1867.
[34] The west slope specimens may be all of species 20.
[35] A specimen figured by Mr. Tryon in the last number of the “Journal” just received, (May, 1867), as “var. minor,” from Idaho and Nebraska, seems to have an obscure band, which, together with its form and want of wrinkles, indicate entire distinctness from Townsendiana. The small form of the latter found by me in Montana has no band, and seems close to Binney’s anachoreta, of which supposed specimens from “Oregon” are in Mr. Rowell’s collection. The Eastern Mesodon clausa, elevata and perhaps others, have been found banded occasionally, but without the paler margins, and only as an exception.
Prof. W. P. Blake read the following: