UNIVALVES. HELIX. 



115 



Ihe H. hoeinastoma, which is admired for its elegant band- 

 ings and rose colored lips. A black lipped variety of this 

 shell has lately been discovered, which is also extremely 

 rarej the body of the shell being pink, forms a beautifnl 

 contrast with its jet lips. 



Of the elongated or tapering Helices, may be particu- 

 larized the H. decollata, H. scalaris, H. circinata, (which 

 has some resemblance to the Turbo scalaris), H. columna, 

 and the H. stagnorum, a fresh- water species. 



The last division contains the ovate and imperforated 

 species; of which the H. pupa, H. barbara, H. amarula, 

 H. stagnalis, H. fragilis, and H. palustris, may be referred 

 to as examples. 



Many of the Helices inhabit aquatic plants instandmg- 

 waters, lakes, ponds, and ditches: others are found on 

 trees and shrubs, and some harbour among rotten wood. 



HELlX.—SnaiL 



-Whirls with a carinated acute margin. 



S car a baeus — Cockchafer. 

 *Lapicida — Rock. 

 Marginata — Margined. 

 Cicatricosa — Flat-reversed. 

 iEgophthalraos — Horny. 

 Oculus-capri — Goat's eye. 

 *A\he\\a— Whitish. 

 Maculata — Spotted. 

 Albina — White. 

 Striatula — Striated. 

 Algira — Yellowish. 

 Leucas — Purple-lined. 

 Lsevipes — Reverse-whirled. 



E xilis — White-striped. 

 Vermiculata — Rough'dotted. 

 Candida — Pale. 

 Spadicea — Chesnut-colored. 

 I ncarnata — Flesh-colored. 

 Sericea — Silky, 

 Crenulata — Black-tipped. 

 *Planorbis — Notch-lipped. 

 Complanata — Flat-umbilicated. 

 Ringens — Grinner. 

 Sinuata — Sinuous. 

 Lucerna — Lamp. 

 Lampas — Orange-lip. 



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