160 CRETACEOUS GASTROPODA 
flat above, and at about the middle roundly angulated, each of the succeeding 
whorls reaching high up towards the angle, and covering the greater portion of the 
lower half of each preceding whorl. There are about twelve blunt, transversally 
elongated tubercles on the angle of each volution, being produced by a thickened 
elevation of the margin of the outer lip on the same, and disappearing quickly 
towards the sutures. The entire surface is covered with spiral strize, unequal among 
themselves, generally alternately thinner and thicker; three are placed posteriorly, 
and the four which cross the tubercles, and which are all visible only on the last 
whorl, are the strongest of all. 
The columella is hollow, and the inner lip without a trace of folds, as the 
interior, truncate edge of the canal, indicating a notch, cannot be compared with a 
fold or tooth. The margins of the aperture are not preserved, and remain to be 
traced; but judging from the total aspect of the shell, and its resemblance to the 
other species of Zrichotropis, combined with the total want of any columellar plaits, 
there can be but little doubt that the species belongs to this genus. 
Locality —S. W. of Alundanapooram ; the figured specimen is as yet unique. 
Formation.—Trichinopoly group. 
XVI. Family—CANCELLARIIDAL. 
(Vide Adams’ Gen. I, p. 275; Gray’s Guide, 1857, p. 23; Chenu’s Manual I, 274). 
The anatomy of the animals of the Canczzzarmp is in many respects as yet 
defectively known, but as regards the structure of the shell there is no question, that 
the place assigned by H. & A. Adams to the family, close to the Cerrrazp#, cannot 
be seriously objected to. In having generally a distinct siphonal fold on the mantle, 
and usually a more or less distinet canal on the shell, they undoubtedly ought to be 
located not far from the Czrrrmip and towards the end of the SrpHonosromaTa, 
forming thus gradually a passage to the Hotosromara. There are some points of 
relation between the Canornzarupa& and the Yrrrermpz, which we shall notice 
subsequently. 
The proboscis of the animal of Cancellaria is very short and rudimentary ; 
the eyes are usually sessile on the outer side of prolonged tentacles, which are 
thickened, and close together near the basis; teeth and operculum are not exactly 
ascertained, although the former are stated by Troschel to resemble those of the 
Conip#; these and other doubts increase a little the difficulty of classification, 
as I shall subsequently mention again in the Tzrzzr~p#. Looking to the shells of 
fossil as well as living species of the Bucciyipm and Purrverpz on one, and the 
Trreprips# and Cerrranps on the other hand, they seem to be well placed between 
these two families. I would on this occasion recall the eocene species Buccinum 
fusiforme, Desh., B. Andrei, Bast. B. Vicaryi, d’Arch. (India), or the miocene 
Bue. turbinellus, Broce. and other species, which have probably to be withdrawn 
from the Bucceryrp# and placed in the family CancerzaruD2Z. 
