814 CLASS XIII. 



Sp. Pupa muscorum LAM. , Turbo muscorum L v PFEIFFER Schn. I. Tab. 3, 

 figs. 17, 1 8; Pupa mumia LAM., BLAINV.' Malac. PL 38, fig. 5, &c. 

 Add genus Chondrus Cuv. 



Clausilia DRAP., 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 1 .) 



This genus is much allied to Pupa, and may, as DESHAYES decides, be 

 united with it. In most of the 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 DRAP., Helix perversa MUELL., PFEIFFER Schn. i. Tab. 

 in. fig. 30. Here also belongs the genus Cylindrella PFEIFFER. 



Bulimus DESHAYES, nob. (Bulimus and Achatina LAM., species 

 of genus Bulimus ScoPOLi, BRUG.). 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, JBulla virginea L., D'ARGENV. Conchyl. PI. n, fig. 

 N, BLAINV. Malac. PL 38, fig. 2, Cuv. R. Ani., ed. ill., Moll. PI. 25, fig. 4 ; 

 South America; Bulimus columna, Helix columna GMEL., Encycl. meth., 

 Vers. PI. 459, fig. 5, BLAINV. Malac. PI. 40, fig. 3, &c. 



Bulimus LAM. Columella not truncated, continuous with margin 

 of aperture. Labrum often reflected, incrassated (spec, of Helix L.). 



Sp. Bulimus lubricus BRUG. (Helix subcylindrica L. ?), STURM DeutscJd. 

 Fauna, vi. Heft 4, Tab. 4, PFEIFFER Schn. I. Tab. 4, fig. 6. Bulimus 

 citrinus BRUG., Helix perversa L., D'ARGENVILLE Conch. PL 9, fig. G, 

 MOUSSON Tab. xx. fig. 5, &c. 



Helix BRUG. (Species from genus Helix L.). Four distinct 

 tentacles. Shell orbicular or depresso-conical. Aperture broader 

 than long, lunate, with penultimate wreath prominent internally. 



Comp. DESHAYES Diet, classiq. d'Hist. nat. vin. 1825, pp. 74 89, 

 Encycl. meth., Vers. n. pp. 188 266, under Helix. 



1 Compare on this part, to which the genus Clausilia owes its name, J. E. 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. 



