, 50 



This fossil is represented Plate V. Fig. 5, and by its side are sketches of 

 the minute adherent serpulae. 



Lamarck, adopting certain constant characters, which seem to war- 

 rant the separation, has divided the shells forming the Linnaean genus 

 Patella, into the five next following genera. 



II. Patella. A shield-formed or subconical, and not spiral univalve, 

 without perforation or marginal fissure. 



It appears that nine species have been found, in a fossil state, in the 

 neighbourhood of Paris : P. dongata, P. dulcis, P. scutatella, P. dilatata, 

 P. Cornucopia, P. spirirostris, P. retortella, P. Pennata, and P. squamte- 

 formis. 



The patellite, Plate V. Fig. 21, for which I am indebted to the kind- 

 ness of John Hawker, Esq. of Dudbridge, in Gloucestershire, is from 

 the stone quarries near Minchinhampton. It is nearly circular, rising 

 obliquely into a depressed distorted cone, and is marked with longitudinal 

 radiating undulated rugae, intersected by transverse lines of growth. 

 It is now completely spathose. Its matrix is a light calcareous stone, 

 formed chiefly of Oolithi, mixed with numerous minute shells. 



In the immense shelly cliffs of Harwich and of the neighbouring coast, 

 I have found an acuminated, slightly striated patellite, in every respect 

 resembling P. ungarica, Linn. The longest diameter of a beautiful and 

 perfect specimen of this fossil, is full two inches and a half. In the same 

 cliff 1 find a patellite, which appears to correspond very closely with 

 P. lavis fusca, List, and another which approximates to P. spirirostris, 

 Lam. 



P. cornucopia, Lam. is a beautiful species. Among the specimens 

 which I possess is one which, although it has the general character of 

 this species, is much narrower than those depicted by Lamarck ; but I 

 am not competent to determine whether it should be considered as a 

 distinct species, or only as a variety. 



Among the specimens I have from Grignon is P. dilatata. Lam. and 



