28 
My specimen is a very neat one from the Fuller’s-carth 
Rock at Small-Cossall, near Bath. The Rev. H. Stein~ 
hauer sent it to me in 1813. 
— 
PLAGIOSTOMA obscura. 
TAB. CXIV.— Fig. 2. 
Spec. Cuar. Rather gibbous, oblique, ovate, 
smooth, externally ribbed? with twenty-five 
internal sulci: -anterior side flattish; beaks 
prominent. 
eR wen 
Tre width of this shell is greater than the length; it iselegant 
in form, the anterior side not being so straight as in most 
Plagiostomx, and the beaks more elevated. 1 am not cer- 
tain, but suppose the margin to be toothed. This specimen 
from Kellaway was obligingly presented to me by Mr. 
Salmon. 
PLAGIOSTOMA pectinoides. 
TAB. CXIV.—Fig. 4. 
SPKc. Cuar. Depressed, a little oblique, obovate, 
rather argular at the back ; beak pointed; sur- 
face with twentv or more carinated ribs, trans- 
versely striated; internally plane; margin 
toothed. 
Pe 
Berween each of the ribs the space is very narrow, a 
little elevated and terminated at the margin by a tooth; the 
transverse striz are little else than lines of growth, but they 
are very numerous and sharp. Both sides are straight, the 
anterior one twice the length of the other; the ears are pro- 
minent and the general contour is that of a Pecten. 
From a clayey part of the soil at Pickeridge Hill, by 
favour of Miss Hill. 
