82 LUCINID &. 
verum, late the ‘nitidum’; both are in the vase with the 
highly-punctured one captured 20th June last, now quite 
vigorous, in company with the L. sguamosum alluded to as 
taken 2nd July; this capture has given me the advantage of 
a live examination of the two completely opposite conditions 
of the ‘ convexum,’ whereas the one above was only referable 
in comparison with an account of a live ‘ nitidum’ taken last 
year. And I can again state that the two varieties are 
identical. 
I give another proof of identity. I have just (1852) taken 
alive a curious example, that shows one half of each valve 
finely punctured and the other grossly granular. 
LUCINID. 
This family has only one genus, Lucina, which includes 
about eight species. Live specimens of the typical L. borealis 
are of rare occurrence; we have met with none for forty years 
on the Devon coast, and of the L. rotundata only a small 
example has been examined. Nor have the animals of the 
L. flexuosa and L. ferruginosa been seen by us, but we receive 
them sub fide Forbesii et Hanleyi. 
Since this was written, it will be seen below, that fortune 
has been favourable, and enabled us to fill up some of the 
gaps in the species of this family, but the curious incidents 
attending it are so largely noticed in the descriptive history as 
to dispense with further remarks. 
LUCINA, Bruguieére. 
L. rotunpata, Montagu et nobis. 
Diplodonta rotundata, Brit. Moll. ui. p. 66, pl. 35. f. 6 ; (animal) pl. M. 
fide 
The present account of the species was written at Exmouth, 
in the summer of 1849, and the reason of noting the date will 
shortly appear. 
Animal lentiform, moderately thick; mantle pla, some- 
