NO. 5 



Greatest 8.2 9.9 4.2 



Least 4-7 6.8 3.4 



Average 6.75 8.23 2,-77 



=» Ape.x entire. 



U.S.N.M. no. 428586 contains three specimens received from Dr. 

 Y. T. Yao, of the Central Field Health Station, National Government 

 of the Republic of China, collected at Huangchou, Anhwei Province. 



This species is differentiated from the other two having the margi- 

 nal denticles 7:5, by having the ribs exceedingly strong and the 

 incremental lines very heavy. 



ONCOMELANIA SCHMACKERI Mollendorff 



Plate I, fig. 18; plate 2, fig. 17; plate 5, fig. 3; plate 6, figs, i, 5, 8, 9 



1888. Oncomclania schmackcri Mollendorff, Malakoz. Blatt., n. s., vol. 10, 



p. 143, pi. 4, figs. 4a, b. 

 1890. Hemibia schmackeri Heude, Mem. Concern. Hist. Nat. Einp. Chinois, 



p. 168, pi. 33, figs. 1-7. 

 1890. Hemibia hupensis Heude, Mem. Concern. Hist. Nat. Emp. Chinois, p. 168, 



pi. 33, fig- 19- 

 1890. Hemibia carectoriim Heude, Mem. Concern. Hist. Nat. Emp. Chinois, 



p. 169, pi. 22, fig. 16. 



4 



