Pvn H,i I'UitlS

22 TEREBRATULID^.
The beak resembles that of Lingida. Very young
shells are not tuberculated. This species cannot be mis-
taken in any stage of growth for the fry of Terebratula
caput-serpentis, which are of quite a different shape,
and more inequivalve than the adult. I have specimens
of the fry of that species only half the size of A. capsula.
The fry of T. cranium, which I have taken of
even a smaller size, have a longer and more slender
From the
shell, and the valves are decidedly unequal.
young of A. cistellula the present species may be distin-
guished by being of a regularly oval shape and more
convex in every part, but especially by the contracted
hinge-line and comparatively small aperture.
Professor King proposed to make this species the type
of a new genus, which he named Givynia, out of com-
pliment to me ; but although I duly appreciate the
intended honour, I cannot conscientiously accept it.
Although the species is unquestionably
distinct from
any of the foregoing, it may be the young of A. Neapolitana
(probably T. cordata of Bisso) and ; I feel
pretty
confident that the last-named species will be found on
our own as well as the Mediterranean coasts.
Terebratella (or Megerlea) truncata has but a very
slender claim to be admitted into our fauna. Dr.
Turton's cabinet contained a specimen bearing, in his
handwriting, the name of " Terebratula caput serpentis,"
and the locality " Torquay ." It is not uncommon in
the seas of southern Europe ;
and according to Collard
des Cherres it has been found on Caryophyllice at Quim-
per. In a footnote to the '
British Mollusca' ii.
(vol.
p. 362) this species has been accidentally
mistaken for
Argiope decollata, with reference to Turton's shell.
I am by no means satisfied that Khynchonella psit-
tacea still inhabits the British seas, although there is