47 
tlie same colour ; within the shell is while pellucid Carbon- 
ate of Lime, beautifully crystallized in primitive rhombs, 
and several varieties with truncations, bevillings, &c. and 
sometimes of a pretly pink colour, sometimes yellowish 
with spots of Oxide of Iron and Manganese ; some round- 
ing, not unlike B. M. Tab. 436 & 437, and these line the 
shell and cover the corneous processes, very elegantly 
pointing them out. Some Sulphuret of Zinc or Blende was 
in the Limestone with them. 
TEREBRATULA carnea. 
TAB. XV.— F. 5 and 6. 
Spec. Char. Depressed, smooth, obtusely five sided, 
front edge short, valves equally convex, slight- 
ly flattened along the middle. 
An inch or more in length, and the same in width ; often 
of a dull red colour, the margin is not undulated as in the 
next species. 
The soft Chalk of Trowse, near Norwich, affords the 
most perfect specimens of this species, which seem so little 
altered, that they look almost as if some one had contrived 
to gather them fresh, and after taking out the animal, had 
buried them in the soft Chalk, which had afterwards 
hardened a little. They are remarkable for being of a fleshy- 
red colour. Being enabled to empty the shell, I have an 
opportunity of showing the inside with the curious hinge 
and appendages, f. 6. I have received similar shells from 
the softish Chalk near Warminster, as well as from Devizes, 
by favour of Mr. Salmon. Darker varieties were found about 
Coteswold, Gloucestershire, by Mr. Richard Taylor, jun. 
TEREBRATULA subundata. 
TAB. XV.— F. 7. 
Spec. Char. Nearly circular, depressed, smooth, 
valves equally gibbous, front margin straight 
or slightly depressed in the middle, with one 
undulation on each side of it. 
— 
Ijength about one inch, rather longer than wide, front 
margin but slightly undulated \ the surface more uniformly 
convex than in the last. 
