22, PROCEEDINGS OF THE CALIFORNIA 
Binney’s latest work states that its lingual dentition differs from the other 
known Arionte, approaching the last-named genus. 
M.anachoreta W. G. Binn. Compare *‘ H. lesa Rve.’’ Conch. Icon. 
Helix, Pl. CCX, described as ‘‘ granulated, Hab. unknown.”’ 
Subgenus Apntopon Raf. ‘‘ Differs from the genus Helix by its rounded 
mouth, one-toothed columella, and umbilicus. One specimen in Kentucky, 
remarkable, A. nodosum. Three whorls of spire embossed, and lightly 
wrinkled concentrically beneath ’’ (Journ. de Physique, 1819). The rounded 
mouth also distinguishes it from Stenostoma* and there seems to be no species 
in Kentucky to which it can apply, except a variety of monodon, common in 
the west, retaining the embossing lett by the bristles of the young (Helix Leati 
Ward). That species forms a link between the subgenus Stenostoma and the 
more different group of Odotropis , to which I applied it in 1868. 
Our two species are so closely connected as to be hard to separate, and one, 
the germanda, has often, if not always, the internal tubercle characterizing 
most of the subgenus Stenostoma. They agree with O. monodon in fewer ribs 
on the jaw than in the type forms. 
Mesodon (Aplodon) Columbiana Lea. The uncertainty of the 
difference in the jaws of this species compared to that of germana (as described 
and figured by Bland & Binney in Ann. N. Y. Lyc. N. H. X, p. 304, pl. xiv, 
f. 2 and 4) is shown by jaws extracted by myself from shells that would prob- 
ably be all considered Columbiana by those authors. 
1. A Sitka jaw is strongly arched, with eight broad ribs. 
2. §S. F. specimens have nine or ten ribs, stronger, but narrower. 
3. A Santa Cruz specimen (toothed and imperforate) has them similar, 
thus exactly filling the gap between B. & B.’s jaw of Columbiana with eight 
narrow ribs, and that of germana with eleven broader ones. The proportions 
they give for the soft internal organs are very unreliable, as aleohol produces 
very different forms in those of the same species, and they even differ 
in individuals with season and age (see Prophysaon). I am, therefore, 
compelled to consider germana as only a variety of Columbiana. This species 
has been found near Calistoga, Napa Co., by Dr. Yates, with Vancouverensis, 
infumata and Diabloensis, associated at no other locality. 
M. (Dedalochila) Harfordiana Cp.t 
I have heard of what was probably this species in the mountains east of 
*This name, used in 1818 and 1831, was evidently intended to include Stenotrema described 
in 1819, that name having been pre-occupied in 1815, and being as applicable to ‘‘ narrow 
umbilicus”’ as ‘‘narrow mouth.” Raf.’s type convexwm is prior to Ferussac’s name, and 
his manuscript was probably altered in Europe before printing. 
+ Genus Gonosroma Held. This European form, type obvoluta, is connected with my 
Ammonitella Yatesti, by the ‘* Drepanostoma nautiliformis’”’ Porro, of Italy, but the three 
species are different enough, apparently, to form three subgenera. ‘‘ H. ammonitoides Rve.”’ 
of Australia, is still more like mine in the form of the mouth, but highly colored. The 
animals of all need thorough comparison, and also with similar concave shells from the 
Pacific islands. Those who unite mine to Helix should call it ‘‘ H. ammonttella Cp.,”’ there 
being a H. Yatesii Pfeiff. 1855. 
