It is not mentioned by Chenu, in the “Manuel de Conchyliologie.”
In the “Supplementary Report to the British Association,” by Dr. P. P. Carpenter (page 674), are given the views of Mr. W. G. Binney, one of the most eminent of American conchologists and particularly devoted to the Pulmonates. He places the mollusk in question, between the genera Limnæa and Physa, in the Subfamily Limnæinæ, of the Family LIMNÆIDÆ.
Investigations as to the animal, however, suggest the propriety of separating it, if not (as a Family Pompholidæ) entirely from the Family LIMNÆIDÆ, at least in a subfamily by itself.
In the few specimens which I have been able to examine with regard to the dentition, the dried animal has not yielded very satisfactory results, and I do not, therefore, feel justified in entirely separating it until more is known.
In the following table, a West Coast species is given as a type of each genus:
CLASS PULMONATA.
Family LIMNÆIDÆ, H. & A. Ads.
Subfamily Limnæinæ, H. & A. Ads.
West Coast Genera: