NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 29 



KATAYAMA CANTONI Bartsch 



Plate I, fig. 3 ; plate 2, fig. 13 ; plate 4, fig. 6 



1924. OncomcJania iiosophora Annandale, Amer. Journ. Hyg., Mon. Ser. no. 3, 



pp. 283-284, in part. 



1925. Katayama fausti cantoni Bartsch, Journ. Washington Acad. Sci., vol. 15, 



pp. 71-72. 



1926. Oncomclania (Hypsobia) nosophora Germain and Neveu-Lemaire, Ann. 



Parasit., vol. 4, pp. 292-293, in part. 



Shell elongate-conic, thin, semitranslucent, horn-colored, the outer 

 lip bordered with a slightly darker edge. The early whorls eroded, 

 those remaining well rounded and marked by obsolete incremental 

 lines, and on the last whorl by indications of irregularly distantly 

 spaced, axial threads. Suture constricted ; periphery well rounded. 

 Base well rounded, narrowly umbilicated and marked by the same 

 sculpture that characterizes the spire. The last whorl has a little 

 behind the aperture a moderately thick callus that extends over the 

 base of the lip to the columella, which it somewhat thickens. Aperture 

 ovate ; outer lip slightly expanded and reflected and adnate to the 

 preceding turn at the parietal wall. The operculum is thin, horn- 

 colored, and paucispiral with 3.2 whorls, and has an excentric nucleus. 



The radula has the typical rachidian tooth . The lateral is also 



typical, 2-1-3, that is, 2 smaller inner denticles with a large third tooth 

 followed by 3 lesser denticles. The inner marginal has 7 denticles, 

 the outer 5. 



The type, U.S.N.M. no. 362027, was collected by Dr. E. C. Faust 

 at Fatshan, near Canton, China. It has 5.3 whorls and measures : 

 Height, 6.4 mm ; diameter, 2.8 mm. 



An additional specimen, U.S.N.M. no. 362028. from the same 

 source yields the following measurements : Height, 6.3 mm ; diameter, 

 3.1 mm. It has 5.3 whorls. 



This species, which we first considered a subspecies of fausti, is 

 far removed from that by reduction of the denticles of the inner 

 marginal tooth to 7. The shell also is thinner and more fragile. 



SCHISTOSOMOPHORA, n. gen. 



Genotype. — Prososthenia quadra-si MoUendorff. 



The discovery of the intermediate host of the Asiatic blood fluke 

 in the southern Philippines by Tubangui made it desirable to investi- 

 gate its relationship to the other schistosomophorous moUusks, with 

 the result that although related to Katayama and Oncomelania, the 



