938 HELIX. 



ARENARIA. 116. Shell minute, glossy, with very 

 thin longitudinal striae ; spire sub-hemisphse- 

 rical and the whirls reversed. 



Helix areiiaria. GmeHn, p. 3644. 



Spengler Nov. Act. Dan, i. t. 1. f. 6. Chemnitz, ix. part 

 1. p. 129. t. 113. f. 972 and 973. 

 Found among the sea-sand at Rimini in Italy. Spengler. 

 This shell appears by the figures to be about a line long, and 



rather more than half as broad, and is white and glossy. 



JANTHiNA. 117. Shell nearly imperforate, roundish, 

 obtuse, diaphanous, and extremely brittle ; 

 aperture sub-triangular, with a notch in the 

 margin of the outer lip. 



Helix janthina. LinncEus Si/st. Nat. p. 1246. Born 



Mus. p. 382. Schroeter Einl. ii. p. 155, and Inn. Bau 



Conch, p. 62. t. 5. f. 1. Gmelin, p. 3645. Brookes's 



Introd. p. 129. t. 8. f. 107. 



Trochus janthinus. Chemnitz, v. p. 57. 1. 166. f. 1577 and 



1578. 

 Janthina fragilis. Lamarck Syst. des Anim. p. 89. 

 Lister Conch, t. 572. f. ^. Rumphius, t. 20. f.2. Gual- 

 ter, t. 64. f. O. Argenville, t. 6. f. S. Knorr, ii. t. 30. 

 f. 2 and 3. Favanne, t. 64. f. K 1. 

 Inhabits the coasts of Europe, Asia, and Africa ; and is com- 

 mon in the Mediterranean. LimicBus. Red Sea. ForskaeL 

 A few of these shells have been picked up on the sea-shore 

 at Oxwich in Glamorganshire. L. W. D. 

 Shell about an inch long, and the breadth rather exceeds the 

 length ; it is remarkably brittle, and has four obliquely stri- 

 ated whirls of a violet colour, which becomes paler towards 

 the summit ; the animal is said to shine by night, and to 

 stain the hand with a purple colour. 



jAMAiCENSis. 118. Shell sub-globular, with the 

 body-whirl ventricose, and the spire short 

 and convex ; aperture large, with the outer 

 lip marginated, and notched at the pillar. 



Helix Jamaicensis. Gmelin, p. 3644. 



Helix pulla. Gmelin, p. 3650. 



Helix terrestris Jamaicensis. CAe»zmV^, ix. part 2. p. 115. 



t. 129. f. 1140 and 1141. 

 Helix, No. 16. Schroeter Einl, ii. p, 183. 



