1^0 I'KOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



67. Bythinia striatula, Bens. 



This species occurred sparingly in a small marsh at Tao Hwan, an 

 island of the Chusan group, where it was associated with Limncea 

 plicatula and Planorbis Chinensis. 



68. ViviPARA Hamiltoni (Metcalfe). 



Specimens which, though not typical, we felt constrained to 

 relegate to this species, were taken at Lahad Datu, Darvel Bay, on 

 the east coast of Borneo, where they occurred sparingly in a small 

 jungle puddle. 



It is rather curious that all the Vivipara referred to in this paper 

 as heing found in China were observed about the stems of growing 

 rice in the paddy-fields. 



In winter-time, after the rice crop has been gathered in, the 

 surface of the paddy-fields becomes as hard, dry, and dusty as a high- 

 way, and yet the Viviparce never seem to seek shelter in the streams 

 which almost invariably run through or by the sides of the fields. 

 It appeared probable that the molluscs buried themselves for the 

 Winter months. With the object of ascertaining whether this was 

 the case, a particular paddy-field, some fifteen yards square, and one 

 of about half a dozen, in a small valley isolated by half a mile from 

 any other cultivation, were carefully watched. About ten days after 

 the field had been flooded, Vivipara Chinensis began to appear, and as 

 all the specimens were thickly encrusted with hard mud, which they 

 never are later in the season, it seemed only possible that they had 

 made their way up from below, and, indeed, some were noted 

 which had only half extricated themselves from the sodden earth. 

 These molluscs must have been deeply buried, as the soil is subjected 

 to a very thorough ploughing before the water is run over it. Curiously, 

 all the specimens contained young. 



All the Fiviparce appear to be greatly relished by the Chinese as 

 articles of diet, and are sold by measure in the native markets. 



69. YlVIPAKA ANGULAEIS (MiilL). 



Found in great numbers at Lin Chao, in the vicinity of Shanghai. 



70. YlVIPAKA quadrata, Bens. 



This species was obtained in the paddy-fields at Tao Hwan Island, 

 in the Chusans, and also purchased in the market at Shanghai. 



71. Vivipara Chinensis, Gray. 



Tliis species was found to be fairly common in the vicinity of Hong 

 Kong, and also at Tao Hwan Island in the Chusans. The specimens 

 varied greatly both in colour and in size. 



72. Ampullaria expansa, Nevill. 



A few specimens which were obtained in a jungle ditch at Lahad 

 Datu, Darvel Bay, British Xorth Borneo, were assigned to this species. 



