NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FEUKE BARTSCH 33 



behind the peristome by a very heavy callus which extends down to 

 the base. Aperture broadly ovate, slightly expanded and reflected 

 and adnate to the preceding turn at the parietal wall. The operculum 

 is thin, corneous, and consists of 1.5 whorls. It has an excentric 



2-1-2 



nucleus. In the radula the rachidian tooth has the formula . 



2-2 



There are ;• denticles on the lateral tooth, of which the middle is 



by far the heaviest. Both the first and second marginals have each 



8 denticles. 



U.S.N.JM. no. 426101 contains 17 topotypes collected by Dr. 



Tubangui, and presented to us by Dr. Faustino of the Philippine 



Bureau of Science, from Polo, Leyte, the type locality. Fifteen of 



these have yielded the following measurements : 



No. of HeiKJt Diameter 



Avhorls ill iiini in nini 



U.S.N.M. no. 426101 6.2 " 4.6 2.7 



6.5 47 2.6 



57 4-9 2.y 



5-5 5-0 2.8 



54 4.9 2.9 



5-5 47 2.7 



57 3-9 2.5 



6.1 4-3 2.5 



6.2 4.3 2.6 

 5-8 4-1 2.5 

 57 3-9 2.4 

 4-3 37 2.4 

 5-6 37 ■2.2 

 4.8 4.7 2.8 

 5.1 47 2.7 



Greatest 6.5 5.0 2.9 



Least 4.3 3.7 2.2 



Average 5.6 4.4 2.6 



» Figured specimen. 



Schistosomophm-a hydrohiopsis can be distinguished from qitadrasi 

 by the stronger axial sculpture and by the narrow umbilicus and in 

 having 8 denticles in both marginals. 



SCHISTOSOMOPHORA MINIMA, n. sp. 



Plate I, fig. 9; plate 2, fig. 7; plate 3, fig. 3 



Shell minute, elongate-ovate, thin, horn-colored, with the outer edge 

 marked by a hairline of chestnut brown. Early whorls decollated in 

 all our specimens, those remaining, inflated, strongly rounded and 



