GASTEROPODA PULMONEA. 333 



When the crescent of the aperture is higher than it is wide, a 

 disposition which always obtains when the spire is oblong or elon- 

 gated, it constitutes the 



BuLiMus Terkestris, Brug. 

 Which requires a still further subdivision: 



BuLiMus, Lam. 



Margin of the aperture tumid in the adult, but without denta- 

 tions. 



Hot climates produce large and splendid species, some of which 

 are remarkable for the volume of their ova, the shell of which is of 

 a stony hardness^ and others for their left shell. 



Several moderate-sized or small species are found in France, 

 one of which, the Helix decoUata, Gm. ; Chemn., cxxvi, 1254, 

 , 1257, has the singular habit of successively fracturing the whorls 

 of the summit of the spire. This is the example referred to, as 

 a proof that the muscles of the animal can be detached from 

 the shellj for at a particular epoch, of all the whorls of the spire 

 originally possessed by this Bulimus, not a single one re- 

 mains(l). 



Pupa, Lam. 



Summit of the shell very obtusej the last whorl, in the adult, 

 narrower than the others, giving it the form of an ellipsoid, or 

 sometimes almost that of a cylinder; the surrounding margin of the 

 aperture tumid and emarginated on the side next to the spire by the 

 preceding whorl. Small species, inhabiting wet places, among 

 mosses, &c. 



Sometimes there is no dentation(2). 



(1) Add Helix avails, Gm., Chemn., IX, cxix, 1020, 1021; H. ohlmga, lb., 

 1022, 1023; H. trifasciuta, Id., CXXXIV, 1215;^. dextra, lb., 1210, 1212;^. 

 intcrrupta, lb., 1213, 1214;//., lb., 1215; /f., lb., 224, 1225-H. perversa,U., 

 CX and CXI, 928-937;-/?: inversa, lb., 925, 926; /T. contraria, Id., CXI, 938, 

 939;^. Iseva, lb., 940 and 949; /f. lahiosa. Id., CXXXIV, 1234; /f., lb., 1232; 

 //, lb., 12Zl-H.cretacea,\d.., CXXXVI, 1263;^. pudica. Id., CXXI, 1042; 

 H. calcarea, Id., CXXXV, 1226. 



Bulla amis Malchi,L.., Gm., lb., 1037, 1038, V, lb., 1041. 



Bulimus columha, Brug., Seb., Ill, Ixxi, 61; Bui. fasciolatus, Oliv., Voy., pi. 

 xvii, f. 5. For the small species of France see Draparnaud, Moll. terr. et fluviat., 

 pi. iv, f. 2132. 



(2) Bulimus lahrosus, Oliv., Voy. pi. xxxi, f. 10, A, B; Pupa edmtula, Drap. 

 Ill, 28, 29; Pupa obtusa. Id., 43, AA;Bul. fusus,, Brug. 



