THE 



JOURNAL OF MALACOLOGY. 



Xo. I. April yxH. 1905. Vol. XII. 



DESCRIPTIONS OF NEW SPECIES OF MARINE SHELLS 



FROM CEYLON. 



By H. p.. PRESTON, F^.Z S. 



(Plates i and ii.| 



The species forming the subject matter of the present paper were 



included in that portion of the collection of the late Mr. Hugh Nevill, which 



was secured by me after its recent disposal ; this collection was especially 



rich in material from Ceylon, and I have every reason to believe that all the 



species now in question were collected in that island. 



Topnatina tenuistriata, n.^p 



PI. i, figs. I — I a. 



Shell elongate cylindrical, spire conical, semipellucid, white, protoconch 



sinistral and turned upon its side ; whorls 3, exclusive of the protoconch, 



very finely spirally striate ; suture deei)l)' channelled ; aperture elongate, 



narrow above, dilated at the base ; peristome thin, somewhat contracted 



towards the centre, slightly expanding outwards at the base ; columella 



descending in a curve and bearing a single plait. 



Alt. 4. 5 millim. ; diam. maj. 1.5. Aperture, alt. 3 millini. ; diam maj. .5. 

 Hah. — Ceylon. 



Retusa serendibensis, n. sp. 

 PI. i, fig. 2. 



Shell cylindrical, semipellucid, marked longitudinally with somewhat opaque 

 lines of growth, and finely spirally striate throughout ; aperture curved, 

 narrow above, dilated at the base ; peristome rounded above and produced 

 beyond the apex, slightly contracted in the middle ; columella descending 

 in a curve. 



Alt. (including outer lip) 3 millim. ; diam. maj. 1.25. Aperture, alt. 3 

 millim. ; diam. maj. .5. 



Hah. — Ceylon. 



JouRN. OK Malac, 1905, vol. xii, No. i. 



