32 TAYLOR: ON NEW VARIETIES OF BRITISH SHELLS. 



color preserved it by natural selection from some 

 enemy, as the ordinary whiter form was more con- 

 spicuous on the long grass, though it was not nearly 

 as conspicuous on the short grass of the open downs, 

 where the herbage is dusty and greyer-looking and 

 intermixed with small particles of chalk,' 



Bulimus acutus var. articulata Lam.=v. jnaritimus Desm. 

 Shell with transverse white ribs, alternating with broad 

 stripes of violet-brown. 



Mr. T. Rogers has kindly given me a specimen of 

 this variety from Tenby. 



Bulimus acutus var. nigrescens n. v. Shell violet-brown, 

 with a few fine whitish transverse striae, and a pale area 

 around the umbilicus. 



Mr. W. Nelson has been so fortunate as to find 

 this variety at Port St. Maiy, Isle of Man; nearly all 

 the specimens found with them have the bands more 

 or less suffused over the surface of the whorls. 



Pupa marginata var. edentula Moq. .A.perture without 

 denticles. 



I have collected this variety at Brough, S.E. 

 Yorks., and Mr. Cockerill has kindly given me speci- 

 mens from Margate. It is the var. i of Gray. 



Clausilia Rolphii var. pellucida n. v. Shell colorless or 

 transparent. 



Dr. J. E. Gray, at p. 2 16 of his edition of ' Turton's 

 British Shells,' says that specimens of this species are 

 occasionally found colorless or transparent, but does 

 not specially name any locality. I have not been so 

 fortunate as to see an example. 



J.C., iv., January, 1883 



