NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 3 1 



2-1-2 



treniis. The formula for it, therefore, is . The median tooth is 



2-2 



oblique, similar in shape to that of the other genera and bears 7 

 denticles, of which the median is much larger than the rest. The first 

 marginal varies from 8 to 9 in the different species, and the outer 

 marginal from 8 to 6. 



Animal. — Of this I know nothing, except the features described 

 under shell, operculum, and radula. Of its ecology I may quote from 

 Dr. Tubangui (40) : 



The Pliilippinc snail further agrees with the other species of Blanfordia, or 

 Oncoiiiclaiiia. in its amphibious habits. It was very seldom encountered under 

 water, but most frequently under dead leaves and other objects in moist sur- 

 roundings above the edge of the water. It was also often seen attached to the 

 stems and leaves of grasses and other weeds and to such objects as house and 

 bridge posts, its position in every case being just a few millimeters above the 

 surface of the water. It was never met with in the vicinity of principal rivers 

 or their branches where the current is rapid, but seems to prefer small bodies of 

 water where there is very little, if any, current. It appears to be a dirty feeder, 

 for it was collected in largest numbers along the banks of a small mountain 

 brook, a pond, a terminal irrigation canal, and irrigated rice paddies, where 

 there are houses and where the presence of human faeces was very apparent. 

 * * * the Philippine mollusk can withstand prolonged desiccation, at least up 

 to four weeks under laboratory conditions. 



SCHISTOSOMOPHORA QUADRASI (Mollendorfi) 

 Plate I, fig. 8; plate 2, fig. 5 ; plate 3, fig. i 



1895. Prososthcuia quadmsi Mollexdorff, Nachrichtsbl. Deutsch. Malakoz. 



Ges., vol. 27, p. 138. 

 1032. Prosflsthcnia qnadrasi TuB.\x(.ri, Philippine Journ. Sci., vol. 49, pp. 298- 



301. 

 1932. Blaiifiirdia qnadrasi Tubangui, Philippine Journ. Sci., vol. 49, pp. 298-301, 



pi. 2, fig. 3. 

 1934. Prososthcuia qnadrasi Bequaekt, Journ. Parasit., vol. 20, pp. 280-282. 



Shell small, regularly elongate-conic, thin, semitranslucent, horn- 

 colored with the edge of the peristome marked by a line of chestnut 

 brown. The first turn of the nucleus has been lost ; the last is rovmded, 

 smooth, and, under high magnification, minutely granulose. Post- 

 nuclear whorls very infiated, strongly rounded, and marked by feeble, 

 almost vertical, incremental lines which give one the impression of 

 very fine threads, closely approximated when viewed under high 

 magnification. Indications of spiral striations here are more pro- 

 nounced than in Schistosouwphora hydrohiopsis. Suture strongly 

 constricted; periphery inflated, strongly rounded. Base inflated, 

 3 



