814 CLASS XIII. 
Sp. Pupa muscorum LamM., Turbo muscorum L., PFEIFFER Schn. 1. Tab. 3, 
figs. 17, 18;—Pupa mumia Lam., Buatnv. Malac. Pl. 38, fig. 5, &e. 
Add genus Chondrus Cuv. 
Clausilia Drav., Lam. (species of Turbo L.). Animal with 
inferior tentacles very short. Shell very often thin, fusiform, with 
apex somewhat obtuse. Aperture subovate, with margins at each 
side connate, reflected. (In the last wreath in most a testaceous 
lamella adhering to columella by a thin elastic pedicle?.) 
This genus is much allied to Pupa, and may, as DESHAYES decides, be 
united with it. In most of tke species the shell is left-handed. Such is 
the case with all the European species, which are small, and are found on 
trunks of trees, on the ground amongst fallen leaves and on stones. Sp. 
Clausilia rugosa Drav., Helix perversa MUBLL., PFEIFFER Schn. 1. Tab. 
111. fig. 30. Here also belongs the genus Cylindrella PFEIFFER. 
Bulimus DESHAYES, nob. (Bulimus and Achatina LAM., species 
of genus Bulimus Scorout, Bruc.). Animal with four distinct 
tentacles, and foot lanceolate posteriorly. Shell ovate, more rarely 
oblong, cylindrical, with last turn rather large, and apex of spire 
somewhat obtuse. Aperture longitudinal. Columella smooth. 
Achatina Lam. Columella truncated towards the end, not con- 
tinuous with margin of aperture. Labrum always acute. 
Sp. Bulimus virgineus, Bulla virginea L., D’ARGENV. Conchyl. Pl. 11, fig. 
N, Buarnv. Malac. Pl. 38, fig. 2, Cuv. R. Ani., éd. ill., Moll. Pl. 25, fig. 4; 
South America ;—Bulimus columna, Helix columna GMEL., Encycl. méth., 
Vers. Pl. 459, fig. 5, Buainv. Malac. Pl. 40, fig. 3, &c. 
Bulimus Lam. Columella not truncated, continuous with margin 
of aperture. Labrum often reflected, incrassated (spec. of Helia L.). 
Sp. Bulimus lubricus Bruce. (Helix subcylindrica L.%), Sturm Deutschl. 
Fauna, vi. Heft 4, Tab. 4, Prerrrer Schn. 1. Tab. 4, fig. 6. Bulimus 
citrinus Bruc., Helix perversa L., D’ARGENVILLE Oonch. Pl. 9, fig. G, 
Mousson Tab. xx. fig. 5, &c. 
Helix Bruc. (Species from genus Helix L.). Four distinct 
tentacles. Shell orbicular or depresso-conical. Aperture broader 
than long, lunate, with penultimate wreath prominent internally. 
Comp. DrsHares Dict. classiq. d’Hist, nat. vit. 1825, pp. 74—89, 
Encycel. méth., Vers. 11. pp. 188—266, under Helix. 
1 Compare on this part, to which the genus Clausilia owes its name, J. HE. GRAY 
in Annals of Nat. Hist. v. p. 243. It is no operculum, but rather a modification of the 
tooth-like prominence at the aperture of the shell occurring in many molluscs. 
