118 HELICIDiE. 



SYNONYMS AND EEFEEENCES. 



Sdix tudiatlata, Binney, Bost. J. N. H. IV. 360. pi. 20. 

 Pfeif., Monog. Helic. Viv. I. 363. 



DESCRIPTION. 



Animal. Not observed. 



Shell. Orbiculate-convex ; epidermis olivaceous ; 

 spire a depressed cone ; wliorls between five and six, 

 slightly convex ; body--whorl voluminous, expanding some- 

 what towards the aperture : aperture transverse, rather 

 circular: lip whitish, slightly reflected; umbilicus cov- 

 ered by a testaceous collar uniting with the reflected hp ; 

 base convex ; a well-defined, rather wide, dark chestnut 

 band, margined with a light color above and below, 

 revolves near the centre of the body whorl, and is more 

 or less visible above the suture on the two whorls pre- 

 ceding the last ; surface of the outer whorl covered with 

 somewhat regular impressions or indentations with ridges 

 between, causing it to look as if covered with scales ; 

 when these are not apparjenj, it, is marked with oblique 

 wrinkles. 



Transverse diameter one inch and a quarter. 



Geographical Distribution. The only individual 

 I have seen, belonging to the cabinet of Andrew Belknap, 

 Esq., was taken near St. Diego, California. 



Remarks. This beautiful and well defined species is 

 unlike any shell which I have, and no description has 

 been met with which corresponds to it. It resembles 

 in its general appearance Helix Dupetithouarsii of Des- 

 hayes (^Oiierin, Mag. de Zool. 1841, pi. 30,) but it is 



