OF C0NCK0LOGY. 27 



directly from the observer. Plate 3d, 

 figures 5th and 10th, G G. 



The venter, or belly, is the most 

 prominent part of the lower whorl or 

 body, and generally situated in the 

 vicinity of the lip ; and formed by the 

 convexity of the aperture. It is in 

 general only made use of in describing 

 shells, whose body is large in propor- 

 tion to the spire. Plate 3d, figures 

 5th and 10th, H H. 



Sides. The extreme edges of the 

 shell, either viewed from the front or 

 back. Plate2nd, fig. 11th, &M-£/t£*A\* 



Aperture, or mouth, is that part of 

 the lower whorl, by which the animal 

 protudes itself. This is one of the 

 principal generic distinctions of Uni- 

 valve shells, and differs very much in 

 shape ; some apertures being rounded, 

 others semilunar, angular, &c. Plate 

 2nd, figures 9th and 11th, CC ; and 



* Right side is when the shell is viewed in front, that side 

 next the observer's left hand. Left side, the side with the 

 aperture in it. 



