144 ANATINIDZ. 
circular ossicle clasping vertically the two valves. This is 
Hobson’s choice ; for we presume that all malacologists are 
aware that no other genus except Anatina is armed with this 
singular distinction. There can be no mistake, as we have in 
our cabinet the ossicles separately displayed, and they prove by 
their identity that the “ costellata” and “‘abbreviata” are the 
scions of the type, the latter bemg the young, and the former 
a variety. Many bivalves of the same species differ much more 
in their varieties; for example, the strongly punctured, and 
the nearly smooth Lepton convecum. Brown im the first im- 
stance placed this genus and species properly as the Anatina 
brevirostris, but unfortunately, to truckle to the fashionable 
nomenclature of the day, he changed it to Thracia brevirostra ; 
but it is probable Olivi’s specific title has the priority. 
For what is known of the animal we refer to the ‘ British 
Mollusca,’ under the titles Neera cuspidata, N. costellata and 
N. abbreviata. If the diligence of malacologists had been a 
little more awakened to the observation of the conspicuous 
ossicle, they might have spared themselves some trouble by 
depositing their articles in genera already constituted, and 
singularly appropriate. 
This species is taken sufficiently abundant on the Scotch 
coasts. 
A. GRANULATA, nobis. 
Corbula ? granulata, Nyst and Westendorf. 
Poromya granulata, Brit. Moll. 1. p. 204, pl. 9. f. 4, 5, 6. 
This is the Poromya of authors. To prevent repetition we 
refer to our general remarks on the Anatina cuspidata. We 
are almost afraid, that in admitting this species as distinct 
from Anatina convera, some error may be committed. We 
have most carefully examined the hinge of the two, and find 
it essentially the same ; both have the ossicle and their poste- 
rior extremities bi-angulated ; they have the same shagreen- 
like points or punctures in the test, increasing in intensity at 
the margins; the siphons have the similar short character, 
and are in like manner ornamented with cirrhi or filaments of 
different lengths; both present on each side the broad amal- 
