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MR. G, F. ANGAS ON A NEW TUDICULA. 



[May 21, 



5. Description of a new Species of Tudicula. By George 

 French Angas, C.M.Z.S., F.L.S., &c. 



[Keceived May 11, 1878.] 



Tudicula inermis, n. sp. 



Shell globosely turbinate, solid, white, ornamented with a broad 

 band and descending flames of an orange-chestnut colour, sculptured 

 throughout with numerous elevated concentric ridges alternating with 

 smaller ones, the interstices crossed by very fine close-set descending 

 striae ; whorls 6|, flattened, last whorl large, tumid, flattened above 

 and angulated at the periphery, suture impressed, apex papillary ; 

 aperture acuminately ovate ; outer lip simple, arcuate, strongly 

 grooved within ; inner lip with a broad white callus spreading over 

 the pillar, and with three transverse plaits at the lower portion of the 

 columella ; canal long, straight, somewhat longer than the entire 

 body of the shell. 



Long. 1 in. 8 lin., lat. 10 lin. 



Hab. Singapore 1 



Tudicula inermis. 



This remarkable shell belongs to the genus Tudicula of H. and A. 

 Adams, constituting the third species of the genus as yet described. 



The genus Tudicula was proposed by the learned authors of the 

 'Genera of Recent Mollusca' (in the Proc. Zool. Soc. 1863) for 

 the reception of two species of shells " with spiny varices and three 

 transverse plaits on the columella," viz. T. armigera, A. Ad., and T. 

 spinosa, H. & A. Ad. The peculiar feature of the species now de- 

 scribed is that it is destitute of spines, although it agrees perfectly 

 with all the other characters of this well-marked genus, which, in 

 my opinion, should be placed in the family Turbinellidse. 



I am indebted to my friend Dr. W. Newcomb, of Ithaca, New 

 York, for an examination of this very interesting shell, two specimens 



