339 



represent cylindrica, but quite a distinct form which has since 

 been separated and named Clausilia turritella by Sowerby. 

 Amongst the numerous specimens of C. cylindrica examined by 

 me the only entire shells I have seen are two in my own col- 

 lection, which were acquired many years ago amongst a miscel- 

 laneous lot at a sale. One of these is now figured. It is composed 

 of 14 whorls, the first seven being opaque white, owing to the 

 withdrawal of the animal from that portion of the shell. That 

 this is a case of true decollation I have satisfied myself by 

 examining numerous shells with six or seven whorls ; in eachcase^ 

 the newly formed apex could distinctly be seen. 



299. Clausilia turritella, Soiuerby. 



Clausilia cylindrica, Hanley & Theobald (non Pfeiffer), Conch. Ind^ 



1870, p. 12, pi. 24, fig. 4. 

 Clausilia turritella, Sowerby, Conch. Icon, xx, 1875, Clausilia, 



pi. 7, fig. 65. 

 Clansilia elegans, Hutton, MS. 



Original description: "Shell yello\v, very narrow elongated,, 

 pyramidal ; whorls 14, slowly increasing, rather convex, last 

 oblong ; aperture oblong, rather square, with a single plait over 

 the columella, columella straight." 



Long 16-75 mm. (ex icon.}. 



Hab. India : Landour. 



The shell from Landour figured by Hanley & Theobald as 

 Clausilia cylindrica of Gray, copied by Sowerby, is altogether 

 different from that species as described and figured by Pfeiffer, so 

 that Sowerby was quite justified in giving it a new name. In 

 turritella the \vhorls are more convex, the aperture is much 

 narrower and higher, and the shell much paler in colour. It is 

 rather unfortunate that the whereabouts of Jtanley's specimen is 

 unknown. It was not amongst the shells from Hanley's collection, 

 presented to the British Museum by Mr. Harvey. 



Family ACHATINIDJE. 

 Subfamily ACHATININ^E. 



Genus ACHATINA, Lamarck. 



Achatina, Lamarck, Mem. Soc. Hist. Nat. Paris, An vii (1799) T 

 p. 75; Fischer, Man. Conchvl. 1883, p. 486; Pilsbry, Man, 

 Conch, ser. 2, xvii, 1904, p. 1. 



TYPE, Bidla achatina, Linne. 



Range. Tropical Africa (one species naturalized in India). 

 Shell ovate or oblong, with conic spire and small apex, two or 

 three earliest whorls smooth, forming a trochiform nucleus, obtuse 



