(_a_) The fauna of the _Chinese province proper_ bears, in many respects, strong marks of relationship to that of India and Siam. Thus _Streptaxis_, _Helicarion_, _Macrochlamys_, _Kaliella_, _Sitala_, _Ariophanta_, _Rhysota_, _Hemiplecta_, _Diplommatina_, _Opisthoporus_, _Pterocyclus_, _Lagochilus_, and _Alycaeus_ all occur, especially in Southern China. The two points in which the sub-region bears special marks of individuality are _Helix_ and _Clausilia_. The sub-genera of _Helix_ which have their metropolis in China are _Satsuma_, _Cathaica_, _Aegista_, _Acusta_, _Euhadra_, _Plectotropis_, and _Plectopylis_. Sinistral forms (compare Fig. 213) are rather prevalent. In several cases--_e.g._ _Trichia_, _Gonostoma_, _Fruticicola_--there is a reappearance of forms which appear to belong to well-known European sub-genera. _Clausilia_ here attains a kind of second centre of distribution, and is represented by its finest forms, which belong to several peculiar sub-genera. The carnivorous Mollusca are not abundant, and are represented by _Rathouisia_ (a peculiar genus of naked slug), _Ennea_, and _Streptaxis_. In the western provinces _Buliminus_ is abundant in several sub-genera, one of which appears to be the European _Napaeus_. [Illustration: FIG. 213.--_Helix_ (_Camaena_) _cicatricosa_ Müll., China.] There is little which is striking in the operculates, which are most abundant in the south, and appear to be mainly derived from Indian and Siamese sources. The occurrence of _Helicina_ (3 sp.), _Omphalotropis_ (1), _Leptopoma_ (2), and _Realia_ (2), is evidence of some influence from the far East. _Heudeia_ is a very remarkable and quite peculiar form of _Helicina_ with internal plicae, perhaps akin to the Central American _Ceres_. Fresh-water genera are exceedingly abundant, especially _Melania_, _Unio_, and _Anodonta_. The occurrence of _Mycetopus_ (a South-American genus) is remarkable. There are several peculiar forms of fresh-water operculates, whose exact position is hardly yet assured. _Land and Fresh-water Mollusca of the Chinese Province_