NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 7 



strength of threads, and spiral lirations which vary in different species 

 from mere indications to well pronounced. The nuclear whorls (tip), 

 usually eroded away, when present scarcely differentiated from 

 the rest of the spire but a little smoother (Blanfordia intcgra). 

 Aperture broadly ovate, peristome dark-edged, usually thicker behind 

 the edge and usually reenforced with a callus behind the outer lip. 

 There is considerable variation in the strength of these characters, 

 not only in the different species of the genus, but in the shells of 

 individual species themselves ; in Blanfordia intcgra the thickenings 

 are merely indicated. Base narrowly umbilicated. 



Operculum. — The operculum is thin, horny, paucispiral. that is. 

 it consists of 2.2 whorls, the nucleus of which is not very excentric. 



Radula. — The radula, like the shell, is larger in Blanfordia than 

 in the other genera. The rachidian tooth has 5 denticles, a large 

 median with a smaller one adjacent to this and the outer still smaller. 

 In worn parts of the radula the latter is sometimes lost, but a search 

 for it in less worn parts will always reveal it. The basals in the 



2-1-2 



rachidian tooth are 4 on each side ; the formula thus becomes — - — . 



4-4 

 The lateral tooth is very oblique with 2 denticles inside of the large 



cusp and 3 or 4 on the outside of this. The first marginal bears 

 7-8 denticles. The outer marginal tooth has a thumblike projection 

 on the inner end of the row of denticles. The denticles vary from 

 6 to 7. A glimpse at plate 3, figures 4-7, will give a better under- 

 standing of these features than does my description. 



Animal. — I have not seen living Blanfordias. Adams (2) says of 

 them, /. ('., Blanfordia japonica and Blanfordia bcnsoni A. Adams: 



The tentacles are short and triangular ; * * * the e3'es are sessile on the upper 

 bases of the tentacles. * * * The foot * * [is] lobed on each side in front and 

 with a posterior dorsal lobe which bears the operculum. Both my species are 

 found on damp banks covered with vegetation, in rocky situations near the sea. 



I have copied Adams' figures of both species. To this Annandale 

 (31) adds: 



The snout is much longer and relatively narrower than that of Oncomclania 

 and is highly extensile, forming a regular proboscis, while the foot is divided by 

 a transverse furrow into two parts, which are capable of independent movement. 

 The snail, instead of gliding evenly on its foot, moves something like a leech, 

 dragging itself forward by means of its snout, the tip of which is applied to the 

 ground, and pressing down the two parts of its foot separately. 



