96 
MOLLUSC A. 
Castalia, Lam., 
Where the slightly codiform shell is striated in radii ; the teeth 
and plates of the hinge are transversely sulcated, which gives them 
some affinity with the Trigonise * * * § . 
There are certain Marine Mollusca which have a similar animal, 
and about the same kind of hinge, that should be placed near the 
Unios; the summits of the shell, however, are more convex, and it is 
marked by projecting ribs extending from the summits to the edge. 
They form the 
Cardita, Briig.i 
Which are more or less oblong or codiform, the inferior margin, in 
some, gapingj. 
Cypricardia, Lam. 
Carditee, in which the tooth under the summit is divided into two or 
three. Their form is oblong, and their sides unequal §. 
M. de Blainville also separates the 
CORALLIOPHAGA, Blainv., 
Whei’e the shell is thin, and the lateral plate considerably effaced, 
which may cause their approximation to Venus. 
One of them is known which excavates coralline masses to form 
its habitation |[. The 
Venericardia, Lam. 
Only differ from the Carditae, in the circumstance that the pos- 
terior plate of their hinge is shorter and more transverse, which 
caused their approximation to Venus; their form is almost round. 
Judging from the impressions of its muscles on them, their animal 
must resemble that of the Carditae and Unios.^ 
Both of them approach the Cardia in their general form and the 
direction of their ribs. I suspect that this is also the place for the 
Crassatella, Lam , — Paphia, Roiss., 
Which has sometimes been approximated to Mactra, and at others 
* Castalia anibigua, Lam., Blainv., Malac., LXVII, 4. 
t Chama anfiqitata, Chemn., VI, xlvii, 488 — 491 ; — Ck. trapezia; — Ch. semior- 
hiculata ; — Ch. cordata, Id., 502, .503 ; and among the fossil species, one of the most 
singular, Cardita avicularia, Lam., Ann. du Mus., IX, pi. ix, f. 6, provided it should 
not be separated. 
X Chama caliculata, Chemn., VII, i, 500, 501 ; — Cardita crassicnsta, Brug., Encyc. 
pi. 234, f. 3. 
§ Chama oblonga, Gm., Chemn., VII, 1, 504, 505, or Cardita ccrinata, Encyc., 
pi. 234, f. 2, or Cypricarde de Guinie, Blainv., Malac., LXV, his, f. 6. 
II Chama coraliiophaga, Gm., Chemn., X, clxii, 1673, 167-1, or Cardita dactyliis, 
Brug., Encyc,, pi. 234, f. 5 ; — Coraliiophaga carditoides, Blainv., Malac., LXXVI, 3. 
^ Venus imbricata, Chemn., VI, xxx, 314, 315, and the fossil species, Lara., 
Ann. du Mus., VII, and IX, pi. xxxi and xxxii. 
