50 
warrant the separation, has divided the shells forming the Linnasan 
genus Patella , into the five next following genera. 
II. Patella. A shield-formed or subconical, and not spiral uni- 
valve, without perforation or marginal fissure. 
It appears that nine species have been found, in a fossil state, in 
the neighbourhood of Paris : P. elongata, P. dulcis, P. scutatella, 
P. dilatata, P. cornucopice, P. spirirostris, P. retortella, P. pennala, 
and P. squamceformis. 
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 longitudi- 
nal radiating undulated rugee, 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 I find a patellite, which appears to correspond 
very closely with P. Isevis 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 another, resembling it in form, but very distinctly marked with 
longitudinal and transverse rugas, much like the Gloucestershire 
limpet. I observe the same characters in another fossil patella from 
the valley of Ronca, in the Veronese. 
