184 
covered by a colourless epidermis, which projects beyond the 
shell-lij) ; suture channelled : aperture oblique, border with a 
wide, shallow depression in the anterior ; widely open so as to 
display the winding columella up to the apex. Ornamented 
by faint accremental striae : the epidermis has raised, branch- 
ing lines, radiating from the apex. Colour white, semi-trans- 
lucent. JJimensions : Major cliameter, 28; minor diameter, 
17 mm. 
Hah. — Backstairs Passage, St. Vincent Guii' : in li5 
fathoms. 
Obs. — I have not been able to trace the existence of a 
callus over the body whorl of the shell, between the inner and 
outer lip, aitliough such was described of the only species 
hitherto known, viz., C. inontrouzieri , Souverb.. The remain- 
ing features of that shell correspond so closely with those of 
my type that a new genus can hardly be proposed, especially 
as the animal has not been previously seen ; but the differences 
are considered sufficient to warrant the creation of a new 
sfecies. 
The calcareous matter does not completely infiltrate 
the shell, whicli in parts is only membranous (see var. lahif- 
7'inthina, below), especially in the earlier and posterior por- 
tion of the last wliorl. I will, however, point out that, prior 
to my examination of the shells, the molluscs had been kept 
in a weak solution of formalin, and it is just possible that this 
chemical may have had some deteriorating influence on their 
delicate tests. 
Mr. E. A. Smith has described"^ a mollusc from Port 
Phillip Bay, closely allied to my new species. No figure of the 
living animal is given, and it is not a fair criterion to make 
a com2:>arison from the description of a contracted spirit 
specimen with the living animals. Mr. Smith's figure of the 
internal shell is more elongate-bulimoid, and the sjDire more 
elevated, than is the case in my specimens. 
Varieties of Caledoniella contusiformis, sj^ec, nov. 
I have before me a number of smaller specimens of Cale- 
donieUa, which in the outer colouration and design of the 
dorsal shield differ markedly from one another and the type. 
The head and foot are coloured the same in each case, and the 
measurements about one-half that of the form described above. 
The similarity in shape of the internal shells and other fea- 
tures is so close that I feel indisposed for the present to 
separate them specifically from C. contusiformis, for it is a 
matter of opinion whether, in this strange genus, specific dis- 
* Ann. and Mag. Nat. Hist., V. Series, 1886. Vol. xviii., 
p. 270. 
