1909.] H. B. Preston : New land and marine shells. 139 



however, more tumid, the iimbiHcus is wider and the peristome is 

 throughout thickened, reflexed and double, which is not the case 

 with C. serendibense. 



I have much pleasure in associating with this species the name 

 of my friend Mr. J. Armitage Ogden, of Kirklees Estate, Uda 

 Pussellawa, on which estate it was collected. 



20. Cyathopoma perconoideum , sp. nov. 



Shell elongately conic, white, bearing traces of having been 

 covered with a light yellowish brown periostracum ; whorls 6, 

 convex, sculptured with several spiral lirae ; sutures impressed ; 

 umbilicus very narrow and partly concealed by the outward 

 expansion of the peristome ; peristome continuous, reflexed in 

 the umbilical region and at the base, simple at all other points ; 

 aperture almost circular. 



Altitude , . . . 2 mm. 



Diam. . . . . 75 ,, 



Habitat — Bandarawella, Province of Uva, Ceylon. 



Allied to Cyathopoma conoideum , Sykes,^ but more elongately 

 conoid in form ; the spiral lirae are also much more numerous than 

 in that species. The umbilicus is narrower, being reduced in the 

 present form to a mere chink; the aperture, moreover, is more 

 nearly circular than in C. conoideum. 



21. Cyathopoma uvaense , sp. nov. 



Shell conoidal, greyish white, covered with a smooth chocolate- 

 coloured periostracum, sculptured with fine spiral somewhat distant 

 lirae ; whorls 4^, shouldered above, moderately convex ; sutures 

 impressed ; umbilicus wide and deep; peristome almost continuous, 

 white, very slightly reflexed ; aperture subcircular. 



Altitude . . . . 3 mm. 



Diam., major .. .. 3'5 „ 



Aperture, alt. . . . . i ,, 



,, diam. . . i ,, 



Habitat — Bandarawella, Province of Uva, Ceylon. 



22. Pecten helleri, sp. nov.. 



Shell nearly equivalve, equilateral, subtrigonal very flat, 

 creamy white, painted with broad, irregular, transverse, blood-red 

 bands and ornamented on both valves with ten-grooved, rather 

 broad and flattened, radiate ribs ; the surface of both valves is also 

 sculptured with closely set, fine, silky, concentric striae ; auriculae 

 nearly equal, radiately grooved, those of tht: left valve stained 



I Proc. Malac. Soc. London, vol. iii, p, 159. 



