202 
THE ESSEX NATURALIST. 
Specimens from Coolmore, Co. Cork, are large, ovately tri¬ 
gonal to ovate, but vary much because of the irregularity of 
their growth ; massive, the lamina: on the top being densely set 
and with numerous narrow and usually close-set costa on the 
lower valve, apparently continuous, as the growth lines are not 
very prominent. 
Deep-sea shells from Jersey are now scarce, and of great 
beauty in their sculpture. One I had sent me by Mr. Sinel, of 
that Island, is fully 5 inches in length, with a breadth of 5$ 
inches, full-grown, and slightly thickened. The upper valve 
is flat, the lamella being finely imbricated and thin, the lower 
valve deeply costated, rising where crossed by growth-lines into 
tubular projections. As is the case with many of the Western 
shells, the upper valve sinks into the lower one, due to the loss 
of the horny matter projecting beyond the margin of the valves. 
The shell, which is probably the same as the 0 . lamellosa 
of Continental conchologists, grows to a full size, 5J inches by 5 
inches, and compares with the Roussillon examples (Mediter¬ 
ranean) figured in the memoir quoted above, and with the living 
Mediterranean shells in my own possession, but I do not think 
it is the species described by G. Brocchi, no authentic figure 
having existed till 1897, when it was published by Sacco, many 
years after Brocchi’s death (Moll. Terr. Tcrz., pt. xxv., pi. ii., 
fig. 3). The need of an accurate figure of Brocchi’s shell was 
shown by the many species or forms that have been assigned 
to it. It is not referred to by Deshayes (Lamarck) 1836, Cams, 
Hidalgo, Monterasato, or Jeffreys directly. Cocconi and MM. 
Bucquoy and his colleagues refer it to 0 . hippopns. Cerulli- 
Irelli (Pal. Ital. xiii., pi. 3, fig. 4), figures a shell as 0 . cdulis 
var. lamellosa, which does not agree with the photo in Sacco 
any more than this does with the shell given in Reeve, Conch. 
Icon, vol. xviii., fig. 54 (Ostrea) which was identified as 0 . 
lamellosa by Philippi direct. The shell marked as 0 . lamellosa 
in the McAndrew Collection, Cambridge, has the laminae broad 
and flat corresponding to the shell referred by Defiance to 0 . 
cristata Lamarck (not Born). The absence of a typical figure 
may have allowed free play in the views of different authors, 
judging from those of Hornes and Fontannes respectively. Ac¬ 
cording to Monterosato (Ann. del Museo Civico, vol. vii., p. 2), it 
is the 0 . ruscuriana of Lamarck, and should not be confounded 
