GASTEROPODA PULMONEA, 



31 



orifice is on the right side of this species of shield, and the anus on the 

 margin of that orifice. The four tentacula are protruded and re- 

 tracted, evolving themselves like the inverted fingers of a glove, and 

 the head itself can he partly withdrawn under the disk of the mantle. 

 The genital organs open under the upper right tentaculum. The 

 mouth has only an vipper jaw, resembling a dentated cresent, which 

 enables these animals to gnaw fruits and herbs, which they do with 

 so much voracity as to effect considerable injury. The stomach is 

 elongated, simple and membranous. 

 M. de Ferussac distinguishes 



Arion, Fer., 



In which the respiratory orifice is towards the anterior part of the 

 shield, which merely contains a few calcareous granules. Such is 



Limax Rufus, L, {the Red Limax;) Feinissac, Moll. Terr, et 

 Fluv., pi. i. and iii. It is everywhere to be met with in wet 

 weather, and is sometimes entirely black, lb. II, i, 2. A decoc- 



Genus Cassidaria 

 .... Cassis .... 



Riciaiila . . . 

 Purpura . . . 

 Moneceros , 

 Concliolepas. 



Harpa 



Dolium 



Buccinum. . . 



Eburna 



Terebra . . . 



Columbella 

 Mitra .... 



Voluta 



Marginella 

 Volvaria .. 



Ovula .... 

 Cyprsea . . 

 Terebellum 

 Ancilla.. .. 

 Oliva . . . 

 Conus .... 



re 

 w; 



••1 



A ascending canal 

 recurved back- 

 wards. 



IJ. 



An oblique notch ', \ 

 > inclining to the ^ 



J a 



back. 



Fourth Family. 

 Les Columellaires, 



Fifth Family. 

 Les Enroul^es. 



Shells having a short canal at 

 the base of the opening as- 

 ceoding towards the back, or 

 a notch in the form of a semi- 

 canal, inclined backward. 

 The animals of all this family 

 produce coloring matter, but 

 particularly the G. Purpura, 

 from which was extracted 

 the celebrated dye of the 

 Romans ; it is contained in 

 a peculiar reservoir near the 

 animal's neck. All of them 

 appear to possess an oper- 



' culum. 



/-No canal at the base of the 

 I aperture, but a subdorsal 

 I notch more or less distinct, 

 ' and having plaits on the 

 i columella of the shell. — The 

 I Columbellae have a small 

 I operculum attached to the 

 »- foot of the animal. 

 f Shell without a canal, but hav- 

 ing the base of the aperture 

 effuse or notched; the whorls 

 of its spire large, compressed, 

 rolled round each other, so 

 that the last nearly conceals 

 all the others, rendering the 

 spiral cavity large and nar- 

 row, and indicating that the 

 body of the animal must be 

 flattened. The two first ge- 

 nera of this family have tlie 

 right lip recurved inwardly ; 

 no operculum, 



