892 HELIX. 



nut ; it lias six whirls, which are well defined by the suturey 

 and marked transversely with close set regular striae ; the um- 

 bilicus is very large, and exhibits all the whirls of the spire. 

 This shell is undoubtedly the H. rotundata of Muller, and 

 the H. radiata of Muller and Gmelin is different. 



STRIATULA. 12. Shell umbilicated, slightly keeled, 

 convex, and striated; base rather gibbous, 

 and the aperture roundisli-lunated. 



Helix striatula. LinncEus Syst. Nat. p. 1242. Gmelin, p. 



3615. 

 Helix polita. Muller Verm. ii. p. 33.? 



Inhabits Algiers. Linnaus. Banks of rivers in Lombardy. 

 Muller. 



Linnaeus, without any reference, had only added to the above 

 specific character, that this shell is grey, with the whirls 

 transversely striated, and the umbilicus large. With this 

 description H. rotundata tolerably well agrees, but in de- 

 scribing II. Algira, Linnaeus has mentioned its resemblance 

 to II. striatula, which, he says, differs in having only four 

 whirls. Muller suspects that H. striatula is the same as 

 his H. polita, which he says resembles II. hispida, and it 

 therefore cannot be at all allied to //. Algira, if Born and 

 Chenmitz have figured the right shell for that species. 



ALGIRA. 13. Shell umbilicated, slightly keeled, 

 and convex, with six w^hirls ; umbilicus per- 

 vious. 



Helix Algira. Linnaus Syst. Nat. p. 1242. Born Mm. 



p. 366. t. 14. f. 3 and 4. Chemnitz, ix. part 2. p. 77- t. 



125. f. 1093 and 1094. Gmelin, p. 3615. 

 Helix Oculus Capri. Muller Ferm. ii. p. 39. 

 Helix ^gophthalmos. Gmelin, p. 3614. 

 Helix Olivetorum. Gmelin, p. 3639.? 

 Helix, No. 279- Schroeier Einl. ii. p. 258. 

 Lister Conch, t. 79- f. 80. Rumphius, t. 25. f. P. Pefi- 



ver Gaz. t. 21. f. 6.? and Amb, t. 12. f. 12. Gualter, 



t. 3. f. G. Argenville, t. 6. f. E. Browne's Jamaica^ t. 



40. f. A and B. Favanne, t. QS. f. L 1. 

 Inhabits Africa. Linnaus. Amboyna. Rumphius. Jamaica. 



Browne. 

 Shell about three-quarters of an inch long, and an inch and 

 three-quarters in diameter, whitish, without any variegations, 

 and coated with a yellowish epidermis ; it has six, or accord- 



