PLATE LXXV. 



HELIX VORTEX. 



COMMON fTHIRL SHELL. 

 GENERIC CHARACTER, 



Aperture of the mouth contracted and lunulated. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell of five wreaths, horizontal. Somewhat convex on the upper 

 side, under side flat, and carinated, or surrounded with a sharp edge. 



Helix Vortex : testa carinata ; supra concava, aperture ovali plana. 



Linn, Si/st. Nat. p. 1243. No. 667. 

 Cochlea testa plana fusca : supra concava, anfractibus quinque, mar- 



gine acuto. Linn. Fn. Suec. I. p. 374. No. 130. 



7. 11. No. 2172. 

 Cochlea exigua, subfusca, altera parte planior, sine limbo, quinque 



spirarum. List. H. An. Angl. p. 145. tit. 28. 



tab. 2. Jig. 28. 

 Cochlea exigua quinque orbium. List. Conch, tab. 138. fig. 43. 

 Planorbis polygirata minor. Petiv. Gaz. tab. 92. fig. 6. 7. 



Morton Northampt. p. 4:11. 

 Helix vortex. Whirl. Penn. Br. Zool. No. 124. tab. Si. fig. 124. 



