ANATINA. 147 
very similar hinge and dentition, have satisfied us of the 
family identity. Though, in our only specimen of the “ fer- 
ruginosa,’ the moveable ossicle is not present, probably in 
consequence of its bemg removed with the animal, still we are 
convinced that in perfect and fresh specimens, opened with 
great care, the ossicle will be found; the delicacy and fragility 
of this appendage are excessive, and though we have several of 
the A. bidentata in beautiful condition, nimety-nine out of a 
hundred cabinet examples will be found imperfect. Conse- 
quently being morally certain that the “ ferruginosa”’ has the 
“shibboleth” of the Anatine, we feel justified in consigning it 
to that family, to range with its congener the A. bidentata. 
We cannot concur with Mr. Alder in recognizing that his 
Montacuta ferruginosa exhibits a connective gradation with 
Kellia, Lepton, and Galeomma. We think these genera are 
well distinguished not only from it, but from each other, and 
are absolutely of different family types. We hope our new 
locations and explanatory remarks on these genera will satisfy 
naturalists that every discordance exists between Lepton and 
Galeomma, with the “ ferruginosa”’; the strict Arcadan foot 
of the first two has no community with the common lingui- 
form pedal appendage of the latter, and all the other organs 
of one and the other are equally heterogeneous ; and lastly, 
we state, that the differences between Kellia and the “ ferru- 
ginosa”’ are equally decisive. 
To prevent repetition, we only give short notes and refer- 
ences to the four remaining species of this family. 
A. pEecLivis, Pennant et nobis. 
Thracia pubescens, Brit. Moll. i. p. 226, pl. 16. f. 2, 3. 
Anatina myalis, Lamarck. 
This is the largest British Anatina, bemg sometimes 
3 inches transverse, and 2 of vertical measure. It differs in 
no essential pomt from its congeners except im size. It isa 
rare species, and it is difficult to obtain a suite of examples 
from half an inch upwards. It is taken in the coral zone at 
Exmouth, but rarely alive. 
L2 
