5. HexicAnton. Ferus. 
Body truncated behind, 
with a cuirass in front, 
under the anterior edge 
of which it retires its 
head : shell posterior ; 
foot separated from the 
body by a furrow and 
with a mucous pore at its 
extremity. Pl. 14, fig. 7. 
Pl. 16, fig. 6. 
6. Hexix. (1) Lin. 
Body with a muscular 
disk or foot, sometimes 
pediculated, more or less 
gibbous and spiral above. 
( 62 ) 
Mantle forming a kind 
of ring or collar (at the 
point of junction of the 
two parts of the body), 
in which is pierced the 
round orifice of the re- 
spiratory cavity. 
(Pulmonacee.) 
Head indistinct, with 
two pair of retractile 
tentacula, the posterior 
the larger, and bearing 
the eyes at the summit ; 
mouth with a pair of 
short appendages. 
a. Bulimus, Lam. (2) 
6. Pupa, Lam. 
c. Scarabeus, Montf. 
d. Chondrus, Cuv. 
e. Amphibulima, Lam. 
f. Clausilia, Drap. (4) 
g. Achatina, Lam. (5) 
Inferior tentacula very small. 
(3) 
(1) V. p. 74. 
(2) Large and beautiful species are found in warm countries : some are remark- 
able for the size of their eggs, the shell of which is stony ; and others for their sinis- 
tral shell. The Helix decollata has the singular habit of breaking the whorls at the 
top of its spire, proving that the muscles of the animal can detach themselves from 
the shell without injury, and that they adhere to different points of the shell suc- 
cessively. How is it that they thus effect the separation of the vessels from one 
part to implant them in another? for it sometimes happens that this Helix or Bu- 
limus has but one of the original whorls of its spire lett. Some species of Pupa, 
Clausilia, and Melania are found in the same state. The Kambeul of Adanson ap- 
ears to pass the dry season in a deep trance, like the Limax of Europe, for he 
Foand several half buried after the month of September. Some had even already 
began to close the mouth of their shell with a whitish plastery matter, to defend 
themselves from the long drought, which continues at Senegal from October to the 
following June. 
(3) This animal may perhaps be considered as a Testacella with a large shell. 
Its inferior tentacula are very small, and it lives on herbs and bushes by the side 
of streams, which has caused it to be thought an amphibious genus. 
(4) In the narrow part of the last whorl we generally find a small plate, slightly 
curved like an S: its use to the animal is uaknown. 
(5) At the extremity of the truncated columella we find the first indication of 
the notches in the shells of the marine Gasteropoda, 
