885 



0tnm XXIX. 



HELIX: 



SHELL UNIVALVE, SPIRAL, SUBDIAPHANOUS, AND 

 brittle; APERTURE CONTRACTED, AND SOME- 

 WHAT SEMILUNAR. 



Subdivisions. f 



* Whirls longitudinally augulated on both 

 sides. 

 ** With a carinated margin on the body-whirl. 

 *** Umbilicated, and the whirls rounded. 

 **** Imperforate, and the whirls rounded. 

 ***** Turreted. 

 ****** Ovate, and imperforate. 



* Whirls longitudinally augulated on both sides. 



scarabjEus. 1. Shell ovate, longitudinally angu- 

 lated on both sides, and the aperture seven- 

 toothed. 



♦ Gmelin's H. atra, p. 3655, H. coriacea, p. 3641, H. FoUiculus, p. 3654, H. 

 tnuralis, p. 3664, H. neritina, p. 3638, U. rufescens, p. 3640, H. spadicea, p. 

 3616, H. splendidula, p. 3655, H. strigosula, p. 3634, H. trigonostoma, p. 3667, 

 H. tutnida, p. 3668, and H. turgida, p. 3641, appear to me to be undeserving 

 of notice. H. coccinea, p. 3651, H. Nucleus, p. 3651, and H. purpurea, p. 3656, 

 are omitted, because Martyn's figures are unaccompanied witli descriptions ; 

 and 30 many of his plates are witiiout any engraved numbers, tliat it is almost 

 impossible to distinguish or quote them with sufficient certainty. H, cinerea, 

 H. carulescens, and H. turgida, p. 3367, are minute shells, and most probably 

 only the larvae of some other species. 



VOL. II. X 



