In this race, which is common in Calcutta, the zooecia are almost circular but truncate or concave anteriorly and posteriorly. They form linear series with few lateral branches. I have found specimens occasionally on the shell of _Vivipara bengalensis_, but they are much more common on the leaves of _Vallisneria spiralis_. TYPE in the Indian Museum. The exact status of the forms described by Jullien as _Norodonia cambodgiensis_ and _N. sinensis_ is doubtful, but I see no reason to regard them as specifically distinct from _H. lacustris_, Carter, of which they may be provisionally regarded as varieties. The variety _cambodgiensis_ is very like my subspecies _moniliformis_ but has the zooecia constricted posteriorly, while var. _sinensis_, although the types were found on _Anodonta_ shells on which there was plenty of room for growth, resemble the confined phase of _H. lacustris_ so far as the form of their zooecia and of the orifice is concerned. GEOGRAPHICAL DISTRIBUTION.--The typical form is common in northern India and occurs also in Lower Burma; the subspecies _moniliformis_ appears to be confined to Lower Bengal, while the varieties _cambodgiensis_ and _sinensis_ both occur in China, the former having been found also in Cambodia and Siam. Indian and Burmese localities are:--BENGAL, Calcutta (subsp. _moniliformis_); Berhampur, Murshidabad district (_J. Robertson Milne_): CENTRAL PROVINCES, Nagpur (_Carter_): UNITED PROVINCES, Bulandshahr (_H. J. Walton_): BURMA, Pegu-Sittang Canal (_Kirkpatrick_). BIOLOGY.--Regarding the typical form of the species Major Walton writes (Rec. Ind. Mus. iii, p. 296):--"In volume i (page 177) of the Records of the Indian Museum, I described the two forms of colonies of _Hislopia_ that I had found in the United Provinces (Bulandshahr). Of these, one was a more or less linear arrangement of the zooecia on leaves and twigs, and the other, and more common, form was an encrusting sheath on the outer surface of the shells of _Paludina_. During the present 'rains' (July 1908) I have found many examples of what may be considered a much exaggerated extension of the latter form. These colonies have been on bricks, tiles, and other submerged objects. The largest colony that I have seen so far was on a tile; one side of the tile was exposed above the mud of the bottom of the tank, and its area measured about 120 square inches; the entire surface was almost completely covered by a continuous growth of _Hislopia_. Another large colony was on a piece of bark which measured 7 inches by 3 inches; both sides were practically everywhere covered by _Hislopia_."