20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



humus and moss numerous specimens of a snail, recognized as a Katayama, were 

 found. * * * The specimens collected were all taken from mossy banks or 

 underneath the moss in the porous humus or loose wet mud. Both living snails 

 and dead shells were found in this locality, but in the clay banks above the stone 

 bridge, where there was no moss, the Katayamas were absent. 



Of Katayama cantoni, Faust (32) states: 



In the village of Tip Kan [Island of Honam], about one mile from Fatshan, 

 the banks of a secondary stream were covered at high water level with moss 

 and loose moist humus. Careful search at this point revealed numerous specimens 

 of Katayama. 



Dr. Li gives an interesting discussion on the ecology and geographi- 

 cal distribution of these forms based upon personal field studies, 

 which students will find fertile reading. 



All the species here discussed are schistosomophorous. The Chinese 

 Katayama fansti and Katayama cantoni were first so implicated by 

 Faust and Meleney. Katayama Hi was found also by Dr. Li to serve 

 as intermediate host. 



KEY TO THE SHELLS OF THE SPECIES OF THE GENUS KATAYAMA 



Shell elongate-ovate foniiosaiui. 



Shell not elongate-ovate. 

 Shell elongate-conic. 



Shell rather slender, obsolete threadlike axial sculpture fine, closely 

 spaced. 



Average measurements of complete shell : 



No. whorls 7.6; height 6.4 mm; diam. 2.8 mm nosophora. 



No. whorls 8.6; height 7.5 mm; diam. 3.1 mm n. yoshidai. 



Shell rather stout, obsolete threadlike axial sculpture coarse and more 

 distantly spaced. 



Shell large ; height more than 7.7 mm Hi. 



Shell smaller ; height not more than 6.6 mm. 



Shell rather coarse fatisti. 



Shell rather delicate cantoni. 



SYNOPSIS OF THE NUMBER OF DENTICULATIONS ON THE MARGINAL 

 TEETH OF THE SPECIES OF KATAYAMA 



