NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 27 



KATAYAMA LII, n. sp. 

 Plate I, fig. 5; plate 2, fig. 11 ; plate 4, fig. 4; plate 6, figs. 4, 7 



Shell elongate-conic, moderately heavy, horn-colored with a narrow 

 chocolate-brown line edging the peristome. The interior of the aper- 

 ture is the same as the exterior. Nuclear whorls 2.1, well rounded, 

 smooth except for fine microscopic granulations. The postnuclear 

 whorls are well rounded, marked by low, obsolete, threadlike incre- 

 mental lines which are rather coarse and of varying size and spacing. 

 Microscopic hrations are merely indicated as a spiral sculptural ele- 

 ment. Suture moderately strongly constricted ; periphery of the last 

 whorl well rounded. Base well rounded, narrowly umbilicated, 

 marked like the spire. There is an exceedingly strong callus behind 

 the outer peristome, which extends over the columella and renders 

 this rather thickened. Aperture broadly ovate, tending toward sub- 

 quadrate. Peristome slightly expanded and reflected and adnate to 

 the preceding whorl at the parietal wall. Operculum thin, horny, 

 paucispiral, having 3.2 turns with the nucleus excentric. The radula 



has the typical rachidian tooth, that is, . The lateral is like- 



3-3 

 wise typically katayamid, having 6 denticles with the third from the 

 inside much larger than the rest. The inner marginal bears 9 denticles 

 and the outer 7. 



The type, U.S.N.M. no. 420949, is a complete specimen with 8.5 

 whorls and measures : Height, 8.0 mm ; diameter, 3.4 mm. 



We have three additional specimens, U.S.N.M. no. 420942, which 

 yield the following measurements. These were collected by Dr. Fu- 

 elling Li, for whom the species is named, at Lin-an and Hiau-Fen, 

 China, respectively. 



No. of Height Diameter 



whorls in mm in mm 



U.S.N.M. no. 420949 8.5' 8.0 34 (type) 



U.S.N.M. no. 420942 7.5 8.2 3.2 



8.7 8.2 3.4 



7-2 7-7 34 



" Type specimen. 



This species is most nearly related to the other two Chinese forms 

 here described, but differs from them conspicuously in its larger size 

 and the radular formula. 



