NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 4I 



Suiiuimry of Characters of the Species of Oncomelania ° 



=■ Oncomelania ciassa and Oncomelania costulata are not included for lack of material. 



ONCOMELANIA MOELLENDORFFI (Schmacker and Bottger) 



Plate I, fig. 19; plate 2, fig. 18; plate 5, fig. i 



1890. ProsQsthenia mocllendorffi Schmacker and Bottger, Nachrichtsbl. 



Deutsch. Malakoz. Ges., vol. 22, pp. 126-7, pl- 2, fig. 7. 

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



pi. 23, fig. 15. 

 1924. Oiicoinclania si(blacvis Annandale, Amer. Journ. Hyg., Men. Ser. no. 3, 



p. 287. 

 1926. Oncomelania (Hemibia) siiblaevis Germain and Neveu-Lemaire, Ann. 



Parasit., vol. 4, p. 294. 

 1932. Oncomelania mocllendorffi Rensch, Philippine Journ. Sci., vol. 49, p. 552. 



Shell elongate-conic, the early whorls a little paler than the later, 

 which are olive-colored. The postnuclear whorls are moderately 

 rounded and crossed hy rather retractively slanting axial ribs, which 

 are about as wide as the spaces that separate them. Of these ribs 

 19 occur on the last turn behind the varix, 29 on the penultimate, 31 

 on the third from the last, 27 on the fourth from the last, 26 on the 

 fifth from the last and 12 on the ribbed portion of the seventh whorl. 

 The parts preceding this are not definitely ribbed. The varix behind 

 the peristome is moderately strong. The intercostal spaces and ribs are 

 marked by rather fine, feebly developed incremental lines. Suture 

 moderately constricted. Periphery well rounded. Base slightly elon- 

 gated and marked by the continuation of the axial ribs which extend 

 onto the umbilicus. Aperture obliquely oval with the peristome 

 slightly expanded and reflected and edged with a dark line, adnate 

 to the preceding turn at the parietal wall. The opercuhnn is typically 



oncomelanid. The radula presents the formula : 2-1-3 : 9 : 5. 



