24 
which a child procured for me on the beach at Par, I 
found five specimens of the single valves. 
D. RUBRA. Flem. Brit. An., p. 434. I have only ob- 
tained a single valve of this rare species. 
The second division is marked by having no lateral 
XEETII. 
CAPSA. 
GENERIC CHARACTER: The Shell transverse, equal' 
valved, close ; the hinge with two teeth in the right valve, 
and one entering bifid tooth in the other; no lateral teeth. 
Ligament external. 
C. CASTANEA. Donax C. Mont. Test. Brit. vol. it 
p. 573. C. C. Flem. Brit. An. p. 434. 
Montagu observes, “ It appears to be a rare species, 3 s 
only one mutilated specimen of a single valve had coin® 
under obsesvation till very lately, which was taken at Fal- 
mouth in Cornwall, five or six years ago ; from which tf® 
did not chose to hazard a description: a few other specimen*? 
recently found at St. Austle bay in that county, and oO 
the coast of DevoD, has enabled us to add it to the Catalog* 10 
of British Shells.” 
CRASSINA. 
GENERIC CHARACTER: The shell suborbicular, equal- 
valved, with scarcely equal sides, close. Two strong 
diverging cardinal teeth in the right valve, and two very 
unequal teeth on the other. Ligament on the longest sid® 
external. , „ . , > 
* C. SULCATA. Venus S. Mont. Test. Brit., vol. /’ 
p. 131. Astarte S. Flem. Brit. An., p. 439. It is i°' 
troduced on the authority of Da Costa. 
* C. DANMONIiE. Astarte l). Flem. Brit. An., p. i* v ’ 
Fleming describes the shell as white, with a dark bro* 
cuticle; but I have seen it no otherwise than a **** 
yellow. Common in the trawl, at Falmouth. 
C. TRIANGULATA. British Museum. Length abo*** 
line, form nearly triangular, with the margin rounde ' 
toothed at the meeting of the valves; beaks promineP ' 
valves smooth, with concentric lines, not raised into t* 1 
rows. Colour pale yellow. Rare. 
SECTION III. 
CONCHIFERA LAMELLIPEDA. 
Foot of the animal broad and thin. 
CONCHA E. #> 
With three cardinal teeth at least in one valve, an* 
many or less in the other ; sometimes with lateral teeth. 
