FAMILY 3. MACROSTOMATA. 39 
The shell of Sigaretus is described as being nearly orbicular, somewhat 
ear-shaped, more or less depressed, and nearly concealed within the 
mantle ; the spire is short, but little elevated, and the aperture is very 
much dilated, entire, and wider than it is long: the margins are disjoined 
superiorly, and the interior exhibits two lateral and rather distant mus- 
cular impressions. 
We cannot appreciate the genus Cryptostoma of De Blainville ; it cer- 
tainly belongs to Sigaretus ; indeed Sowerby asserts that his Cryptostoma 
Leachit is the true ‘‘ Sigaret*” of Adanson. 
Examples. 
Pl. CXLVIII. Fig. 1. 
Sigaretus concavus, Lamarck, Anim. sans vert., vol. vii. p. 208. Des- 
hayes, Enc. Méth. vers, vol. iii. p. 950. 
Pl. CXLVIII. Fig. 2. 
SIGARETUS HALIOTOIDEUS} ? Lamarck, Anim. sans vert., vol. vii. p. 208. 
Martini, Conch., vol. i. pl. 16. f. 151 to 154. 
Helix haliotoidea, Linneus. 
Le Sigaret, Adanson. 
Pl. CXLVIII. Fig. 3. 
Sicaretus Leacui, Sowerby, Genera of Shells, No. 19. 
Cryptostoma Leachii, De Blainville. 
Pl. CXLVIII. Fig. 4. (fossil.) 
StGARETUS CANALICULATUS, Defrance. Sowerby, Genera of Shells, 
No. 19. 
* The genus Sigaretus appears to be altogether omitted in Gray’s classification of the Mol- 
lusca in the Museum Synopsis; but by the situation of Cryptostoma, we are inclined to sup- 
pose he would have referred it to his family of Naticide. 
+ Deshayes asserts, that the shell which is here figured from Sowerby’s ‘ Genera’ is the 
true Sigaretus concavus of Lamarck, and therefore neither the Helix haliotoidea of Linneus, 
nor le Sigaret of Adanson. He considers Fig. 1. to be a new species from the coast of Peru, 
