148 Couthouy's Monograph on 
obtuse angle, pretty prominent, extending obliquely 
from the beaks to the lower part of the shell. The 
cardinal edge is thin and without teeth; it presents 
upon the posterior side of the beaks, a small internal, 
short, sub-triangular, hollow process, in which is attached 
a small internal ligament, visible externally. The 
valves are white and shining internally. The anterior 
muscular impression, is elongated, the posterior is 
rounded and united to the anterior, by a palleal im- 
pression deeply notched posteriorly. ns: Storer'a 
transl.) 
Length hiyana oranti height twelve twen- 
tieths, diameter eight twentieths of an inch. 
Oxservations. This species, according to M. Kiener, 
is found at Cherbourg, and the Mediterranean, and also at 
Falmouth, in England. In all probability, however, this 
last locality is incorrect. His reference to Mr. Montagu's 
figure is also, I think, erroneous, that being, according 
to Dr. Turton, a correct representation of his AnaTina 
declivis, a different species, as will be shown hereafter. 
The tooth also; it may be observed, of Mr. Montagu’s 
figure, is very different from the tooth or apophysis for 
the ligament, in T. phaseolina. In consequence of not 
detecting the circumstance that the figure of Mr. Mon- 
tagu refers to one shell, and his description by some ac- 
cident to another, Mr. Kiener, misled by that author’s 
observations, supposes 'T. phaseolina to have been 
known to Mr. Petiver, when in fact, the shell spoken of 
by Mr. Montagu, as first described by that writer as 
the * white spoon-hinge " (CHama preténuis, Petiver, 
Mus. tab. 94, fig. 4. Anat. preténuis, Turton, &c.) 
