233 



DESCRirXIONS OF SOME NEW SPECIES OF HELICOID AND 

 OPERCULATE LAND-SHELLS FROM CEYLON. 



By E. E. Stkes, B.A., F.Z.S., etc. 



Mead 12th March, 1897. 



PLATE XYI. 



The mateiial on which the followiug pages are founded consists of 

 some specimens collected by Mr. 0. Collett and Mr. II. B. Preston : 

 the number of new forms, exclusive of some not yet itleutiiied, is 

 surprising, when the careful researches of Benson, Nevill, and others 

 are borne in mind. Since both collectors are still at work, it is hoped 

 that further discoveries await them, and that sufficient material for 

 a faunal catalogue may eventually be obtained. 



Save for one species [Corilla anax^ Benson), the known forms of 

 Cor ilia are confined to Ceylon, and are as follows: — 



1. C. Beddomem, Hanley. Haycock Mountain (Beddome) ; near 

 AVatawala (Collett). 



2. C. Charpentieri, Pfciifer. 



C. Chirpentieri var. UinidunenMS, Nevill. 



3. C. Colletti, n.sp. Balangoda (Collett). 



4. C. erronea, Albers. Kandy (Simon); Nuwara-Eliya (Simon); 

 slopes of Pidrutalagala, at 7,000 feet (Preston). 



C. erronea var. erronella, Nevill. 



5. C. Fryte, Gude. Albion Estate, Lindula District (Mrs. Fry). 



6. C. Gudei, n sp. Kurunegala, at 1,500 feet (Collett). 



7. C. Humherti, Brot. Near Watawala, at 4,000 feet (Collett). 



8. C. odontophoni, Benson. Near Fort McDonald, Bandarawella, 

 and Bibiligamua, at 4,500 feet (Layard) ; Alnwick and Ivirklees 

 Estates (Preston; very fine specimens). 



9. C. liivoUi, Deshayes. Kandy (Nevill, Preston). 



It will probably be most convenient for the purposes of recognition 

 if the diagnoses of the two new forms of this genus are drawn up by 

 means of comparisons instituted with their known allies. 



1. CoEiLLA Colletti, n.sp. PI. XVI, Figs. 11-13. 

 Shape strongly recalling that of C. Rivolii, but the new species is 

 much smaller in size. Sculpture also similar in nature, but finer and 

 more closely set. The mouth in the present species not so much con- 

 tracted and not quite so descending ; the lip not nearly so reflexed 

 or thickened. The palatal and parietal lamellae are the same in number 

 in both species, but in C. Colletti the former approach more nearly to 

 the lip, especially the upper two. Of the parietal lamellae, the upper 

 and lower are more nearly parallel, and not so convergent, while the 



