118 



PATELLA. 



A. Furnished with an internal lip or chamber. 



(Plate XXL fig. 3.) (fig. 4.) 



B. Margin angular, or irregularly toothed, 



(fig. 5.) 



C. With a pointed, recurved apex. (fig. 6.) 



D. Very entire^ not pointed at the apex, 



(fig. 7.) 



E. Having the apex perforated, (fig. 8.) 



Shell univalve, conical, mostly without spire. 



The division C, consisting of shells with a re- 

 curved apex, forms a natural link between this 

 genus and the last described. The curvature of 

 the apex approaches more or less to a regular 

 spire, and in some species is precisely of the same 

 description as that of a Haliotis ; but, then, the 

 shell is not flat and ear-shaped, and therefore can- 

 not belong to Haliotis, or to any existing genus 

 but Patella, for there are none equally patulous 



