^2 



Family VII.— TROCHIDyC, Z>'(9r/7. 



Genus I.— Cyclostrema, Marryat. 

 Cyclostrema cutlerianum, Cla7'k. 

 Cyclostrema nitens, Phil. 



Cyclostrema nitens, v Alderi, Je;ff. 

 Cyclostrema serpuloides, Mont. 



Genus II. — Trochus, Rondeletius. 

 Trochus helicinus, Fabr. 



Trochus helicinus, v fasciata, Jeff. 

 Trochus grcenlandicus, C/iem. 



Trochus grcenlandicus, v albida, Jeff. 



Trochus grcenlandicus, v dilatata, Jeff. 



Trochus grcenlandicus, v lasvior, Jeff. 

 Trochus glaucus, MolL 

 Trochus amabilis,/"^/! 

 Trochus magus, Z. 



Trochus magus, v alba, Jeff. 



Trochus magus, v conica. Ma?-. 

 Trochus tumidus, Mojif. 

 Trochus cinerarius, L. 



Trochus cinerarius, v electissima, Bean. 



Trochus cinerarius, v variegata, Jeff. 



Trochus cinerarius, v pallescens, Diiprey. 

 Trochus umbilicatus, Mont. 



Trochus umbilicatus, v atro-purpurea, Jeff. 



Trochus umbilicatus, v decorata, Jeff. 



Trochus umbilicatus, v Agathensis, R'echiz. 



Trochus umbilicatus, v pallens, Duprey. 

 Trochus Duminyi, Reqnien. 

 Trochus lineatus, Da Cos. 



Trochus lineatus, v minor, Jeff. 

 Trochus montacuti, W. Wood. 

 Trochus strl\tus, L. 

 Trochus exasperatus, Penn. 



Trochus exasperatus, v pyramidata, y^^ 



