28 
My specimen is a very neat one from the Fuller Veartla 
Rock at Small-Cossall, near Bath. The Rev. H. Stem- 
hauer sent it to me in 1813. 
PLAGIOSTOMA obscura. 
TAB. CXIV.— Fig. 2. 
Spec. Char. Rather gibbous, oblique, ovate, 
smooth, externally ribbed ? with twenty-five 
internal sulci: anterior side flatfish; beaks 
prominent. 
The width of this shell is greater than the length ; it is elegant 
in form, the anterior side not being so straight as in most 
Plagiostomae, and the beaks more elevated. I 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. 
Spec. Char. Depressed, a little oblique, ob ovate, 
rather angular at the back ; beak pointed ; sur- 
face with twenty or more carinated ribs, trans- 
versely striated; internally plane; margin 
toothed. 
Between each of the ribs the space is very narrow, a 
little elevated and terminated at the margin by a tooth; the 
transverse strias are little else than lines of growth, but they 
are very numerous and sharp. Both sides are straight, the 
anterior o te 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. 
