PULMONATA. 155 



Helicea, Ehrenb. Symb. Phys. 1831. 



Oken, his, 1833, 734. 



Pfeiffer, Symb. ad Hist. Hel. 4, 1841; Symb. ii. 1842; 

 Zeifschr.f. Malac. 1846, 2. 

 Cochleae, Ferussac, Prod. 18, 1819; Tab. Syst. 31, 1821. 



Ranff, Man. 156, 1829. 



Pfeiffer, Naturg. iii. 2, 1828. 

 Pupadse, Fleming, Brit. Anim. 255, 1828. 

 Chilogymnum, Ehrenberg, Symb. Phys. 1831, 

 Chilodontem, Ehrenberg, Symb. Phys. 1831. 

 Colimacidae, D'Orbigny,Moll. Canar. 1837; Moll. Cuba, i. 137- 

 140, 1841 ; Palaont. Fran^. 1842. 



Geinitz, Grundr. d. Verst. 319, 1845. 

 Helicida, Beck, Ind. 5, 1837. 



Synopsis of the Tribes. 



I. Body elongate, attached its tvhole length to the upper surface 

 of the foot, and entirely or partially covered by a dorsal 

 mantle. Scutifera. 



1. Philomycina. Mantle thin, as large as the foot. Shell 



none. Tentacles four. 



2. Limacina. Mantle shield-like, coriaceous on the front of 



the back, entirelj^ covering a flat oblong, not spiral, shell, 

 produced and free in front over the nape. 



II. Body more or less spiral, prominent on the middle of the 

 upper surface of (he foot, and covered with a more or less 

 spiral shell sometimes partly hidden by the reflexed part of 

 the produced edge of the mantle. Cochleophora. 



a. Body and mouth of the shell depressed, being broader from 

 side to side than long from back to front, that is to say, in 

 the longitudinal axis of the shell. 



3. Peltellina. Mantle enclosed in the shell in front, and 



produced behind over the hinder surface of the shell. Shell 

 flat, ear-shaped. 



4. ViTRixiNA. Mantle produced and thickened in front be- 



yond the edge of the mouth of the shell, forming a thickened 

 coriaceous collar on the nape. 



