HELIX. 941 



DissiMiLis. 122. Shell sub-ovate, acuminated, of 

 a yellowish white colour, and the outer lip 

 black. 



Helix dissimills. Gmeliti, p. 3647. 



Helix, No. 266. Schroeter EinL ii. p. Q53. t. 4. f. 10. 



Nerita dissimilis. Midler Verm. ii. p. 184. 



Inhabits Tranquebar. Schroeter. 



Muller says this shell is intermediate between H. vivipara and 

 H. tentaculata, and has described it to be nine and a half 

 lines long and seven and a half broad, pellucid, glabrous, and 

 of a brownish or yellowish white colour, with the base 

 whiter than the other parts, so as to give the body-whirl 

 somewhat of a banded appearance ; it has six whirls, and 

 their convexity is between that of //. vivipara and H.fas- 

 ciata; the aperture has a black shining margin, and the 

 operculum is pellucid, yellowish brown, and shining. 



ANGULARis. 123. Shell sub-conical, with three 

 transverse angulated keels, and of a greenish 

 colour ; aperture roundish and sub-angu- 

 lated. 



Helix angularis. Chemnitz^ ix. part 2. p. l60. t. 134. f. 



1222 and 122.S. Gmelin, p. 3661. 

 Nerita angularis. Muller Ferm. ii. p. 187. 



Inhabits the rivers about Canton. Muller. 



Shell about an inch long, and half as broad, opake, of a green- 

 ish colour, and the inside white; it has five produced very 

 slightly convex whirls, which are minutely striated transverse- 

 ly, and on the body-whirl are three transverse angulated keels, 

 which decrease in number on the spire : Muller has quoted 

 Lister, t. 127. f- 7, which is stated to be a native of Virgi- 

 nia, and appears to me to be a different species ; Petiver 

 Gaz. t. 106. f. 18, is the same. 



NEMORALTs. 124. Shell sub-globular, smooth, dia- 

 phanous, with five transversely banded whirls; 

 aperture roundish-lunated, and the outer lip 

 slightly reflected. 



Helix nemoralis. Linnmis Si/st. Nat. p. 1247. Pennant 

 Zool. iv. p. 137. Da Costa Brit. Conch, p. 76. t. 5. f. 

 1 to 4, 8, 14, and 19. Schroeter Einl. ii. p. 158. Do- 

 novan, i. t. 13. Maton and Racket, in Lin. Trans, viii. 

 p. 206. Dorset Cat. p. 54. t. 21. f. 1, 6, 14, and 19- 



