i 6S Mr. Light foot’s Account of 
Patella ( oblongd ) tefta integerrima oblonga compreffa 
membranacea, vertice mucronato reflexo obliquo. 
Oblong fre(h- water Patella. 
It is perfectly difiindt from the Patella lacufris of LinnjeUs 
both in (hape, and flexure of the Vertex, as well as being defti- 
tute of radiated ftreaks. 
Fig. i. 2. 3. and 4. (Tab. III.) The natural fize in different 
attitudes. 
5. A (hell magnified, with its vertex upward. 
6. Patella lacufris Lin. (hewing the plan of the two different 
/fpeeies. 
It has efcaped the notice of all the authors I am acquainted 
with. 
It was found adhering to the leaves of the Iris Pfeudacorus 
In waters near Beaconsfield, in Buckinghamfhire, by Mr. 
Agnew, Gardener to the late Duchefs Dowager of Port- 
land ; by whofe fagacity all the preceding (hells were difco- 
wered, and by whofe faithful pencil they were drawn* 
- 
I have now done with defcribing the (hells I intended ; but 
before I conclude, it may not be thought, perhaps, quite 
foreign to my prefent fubjedt, to remove, in fome degree, an 
error which has been almoft univerfally adopted by the dealers 
and colledtors in (hells, refpedting certain fubje&s, brought from 
Jamaica, and other parts of the Weft-Indies, commonly known 
by the name of Gold Shells . They are yellow gloffy fub- 
ftances, of an obtufely conical figure, and fize of tares or vetch- 
feeds, compofed of feveral concave brittle imbricated fcales, 
clofely compa&ed, fo as to refemble the foliaceous gem or Bud of 
fome tree, and have generally a hole or perforation in fome 
part. Thefe are commonly fuppofed to be Jhells , or the 
2 embryos 
