HELIX. 973 



HALIOTOIDEA. 190. Shell imperforate, depressed, 

 with undulated striae, and the spire flat; 

 aperture oval, very large, and exposing- the 

 whole inside. 



Helix haliotoidea. Linnaus Si/st. Nat. p. 1250. Mar- 



tiiii, i. p. 197. t. 16. f. 151 to 153. Schroeter Einl. ii. 



p. 176. Born Mus. p. 393. Gmelin, p. 3663. Bruokes's 



Introd. p. J 30. t. 8. f. 111. 

 Sigaretus haliotoideus. Lamarck Syst. des Anim, p. 60. 

 Le Sigaret. Adanson Senegal, p. 24. t. 2. f. 2. 

 I/Oreille de Venus. Favanne, i, p. 590. t. 5. f. C. 

 Bonanni Rec. Supp. f. 14, and Kirch. 3. f. 404. Lister 



Conch, t. 570. f. 21. Rnmphins, t. 40. f. II. Petiver 



Gaz. t. 12. f. 4. Gualter, t. 69. f. F. Argenvilfe, t. 3. 



f. C. A'^m Os^ t. 7. f. 114. K/iorr, vi. t. 39. f. 5. 

 Variety/? Shell extremely thin. 



Bulla haliotoidea. Montagu Test. p. 211. t. 7- f. 6, and 



Vign, 2. f. 6. Maton and Racket, in Lin. Trans, viii. 



p. 123. Dorset Cat. p. 43. t. 22. f. 5*. 

 Inhabits the Mediterranean, American, and Asiatic Seas. 

 Linnaus. Coasts of Amboyna. Rumphius. Mouths of 

 the Niger. Adanson. St. Domingo, Martinique, and Isle 

 of France. Fatanne. 

 This shell is somewhat ear-shaped, and the base measures 

 about fifteen by thirteen lines ; the base is strongly wrinkled, 

 and the upper surface marked with concentrical slightly un- 

 dulated strise, which are crossed and interrupted by irregular 

 wrinkles. The shell is enveloped by the animal, and on this 

 account Lamarck has placed it in a separate Genus among 

 the naked Mollusca. I have no doubt from his description, 

 that Montagu's Bulla haliotoidea belongs to the Genus 

 Sigaretus, and not to the Bullaea of Lamarck ; and it is pro- 

 bably the present species in a younger, or perhaps in a some- 

 what depauperated state, owing to the colder latitudes of the 

 British coasts on which it was taken. Gmelin says, the 

 animal is small and white, with two short tentacula; but 

 this is a mistake, originating in Mulier's having mistaken his 

 Bulla velutina for this species. 



AMBiGUA. 191. Shell sub-imperforate, convex, with 

 remote compressed transverse ribs, and the 

 aperture semi-orbicular. 



Helix ambigua. Linnaus Syst. Nat. p. 1251. Gmelin, 

 p. 3665. 



