38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



In 1924 Faust (33, p. 276) states of Katayama in China that the 

 Katayama species appear to live only in mountain stream water, and 

 the Oncomelania species have been found only in water with con- 

 siderable lime supply. 



Bartsch (35), in his paper on " Some new Intermediate Hosts of 

 the Asiatic Human Blood Fluke ", refers to Oncomelania. 



In 1926 L. Germain and M. Neveu-Lemaire (36), in their " Essai 

 de Malacologie Medicale ", make Ilcmibia Heude, 1889, a subgenus 

 of Oncomelania and recognize under this Oncomelania (Hemibia) 

 Jiupensis Gredler, Oncomelania (Hemibia) sublaevis Heude and 

 Oncomelania {Hemibia) longiscata Heude. They give enlarged fig- 

 ures of a shell which they consider Oncomelania (Hemibia) hnpensis, 

 but which in reality is Oncomelania schmackeri MoUendorff. 



In 1928 Bequaert (37) in his exhaustive paper, " MoUusks of Im- 

 portance in Human and Veterinary Medicine ", refers Oncomelania 

 hnpensis to Hemibia. 



Thiele (38), in his " Handbuch der Systematischen Weichtier- 

 kunde ", 1929, page 150, considers Hemibia of Heude and Katayama 

 of Robson synonymous with Oncomelania. 



Tubangui (40), in his paper, 1932, "The Molluscan Intermediate 

 Host in the Philippines of the Oriental Blood Fluke, Schistosoma 

 japonicum. Katsurada ", refers to Oncomelania. 



Rensch (41), in his " Eine Neue Hydrobiidae von den Philippinen ", 

 calls his shell Oncomelania hydrobiopsis. I have here rechristened it 

 S chistosomophora hydrobiopsis. 



Bequaert (44) in his 1934 paper, " The Molluscan Intermediate 

 Host of the Blood Fluke, Schistosoma japonicum Katsurada ", in the 

 Philippines discusses the relationship of this animal to Oncomelania. 



By far the most important paper, from a molluscan standpoint, 

 was contributed by Dr. Fu-ching Li (46), "Anatomic, Entwicklungs- 

 geschichte, Oecologie und Rassenbestimmung von Oncomelania, des 

 Zwischenwirtes von Schistosoma japonicum (Katsurada 1904) in 

 China." He here gives a very careful anatomic and embryologic, as 

 well as ecologic, study of Oncomelania. I have quoted extensively 

 from this in my introduction to the genus. 



GENERIC DEFINITION 



Shell. — The shell of Oncomelania is elongate-conic, moderately 

 thick. It is covered with a yellow, greenish, or olivaceous periostra- 

 cum, which darkens materially at the edge of the peristome. Nuclear 

 whorls 2, well rounded, smooth except for microscopic granules. The 



