April 11, 1843. 
William Yarrell, Esq., Vice-President, in the Chair. 
Descriptions of ten new species of Cancellaria, from the collection 
of Sir Edward Belcher, by Mr. Hinds, were read. 
CANCELLARIA VENTRICOSA. Canc. testd ovatd, acuminatd, albes- 
cente ; anfractibus septenis, ventricosis, subturbinatis, cancellatis, 
interstitiis quadratis ; aperturd oblongd, prope mediam dilatatd ; 
labio interno expanso ;* columella triplicatéd ; umbilico mediocri. 
Axis 15 lin. 
Hab. The west coast of America, between 12° 28! and 24° 38!, 
north latitude; viz. Realejo, in from sixty to seventy fathoms ; San 
Blas; Gulf of Magdalena, California, in seven fathoms, sandy mud. 
Very similar in its characters to C. candida, but distinguished from 
it in the absence of the secondary impressed lines which cross and 
interfere with the cancellation. C. candida is described with only 
two columellar folds, which might be regarded as another source of 
difference, our shell having three very distinct. But I think it will 
be found on close examination that the former has a third incipient 
fold, which, though very small, truly exists. 
CANCELLARIA URCEOLATA. Canc. testd ovatd, acuminata, levigatd, 
epidermide fuscd indutd ; anfractibus septenis, costatis, superneé 
subangulatis, ultimo subquadrato ; costis parviusculis, rotundatis, 
lineis elevatis decussatis ; aperturd oblonga in canalem recurvum 
effusum desinente; labro subrecto, intus sulcato; labio interno 
expanso ; columelld biplicatd, sed plicd tertid inferiore obsoletd ; 
plicd superiore in dente acuto desinente, sinu inferiore magno ; um- 
bilico parvo. Axis 16 lin. 
Hab. The west coast of America, between 12° 2’ and 21° 32! north 
latitude ; viz. Gulf of Papagayo, in from eight to fourteen fathoms ; 
San Blas, in seven fathoms. 
The elevations which cross this shell are remarkably disposed. If 
the finger-nail is driven over the shell, from the base towards the 
apex, it meets with no resistance, but if in the contrary direction it 
is obstructed at every elevation. ‘The squareness of the last whorl 
and the straight outer lip have a mutual relation, since they are de- 
pendent on each other ; and these characters, taken collectively, will 
be of value in making a diagnosis between nearly allied species. 
CANCELLARIA ALBIDA. Cane. testd oblongd, subattenuatd, cancel- 
latd, albescente ; anfractibus sepienis, interstitiis transversis vel 
subquadratis ; aperturd oblonga ; labra acuto, intis sulcato ; colu- 
melld biplicatd, plicd tertid inferiore obsoletd ; wmbilico minimo, 
subocculto ; canali mediocri, contorto. Axis 13 lin. 
No. CXXIII.—Proverpines or tnz Zoon. Soc. 
