274 BULLID. 
and the Philine of Ascanius, adopted by M. Loven, with 
Bullea: though these ancient titles may have priority of date, 
still, whatever injustice may be done—and it would appear, 
from the want of support of these genera, that it cannot be 
great—it is impossible at this time of day to dispense with the 
Bulla of Linnzus and Lamarck, and the Budllea of the latter, 
which have been so long in use and universally acknowledged. 
I have given a general and anatomical description of Bulla 
hydatis from many live individuals, which have enabled me to 
verify the observations of M. Cuvier, to fill up some gaps, and 
I believe to correct some errors, which, for the reasons I have 
assigned below, have escaped the attention of that price of 
anatomists. 
* Shell external. 
BULLA, Linneus. 
B. nypatis, Linn. et Auct. 
B. hydatis, Brit. Moll. iii. p.530, pl. 114. D. f.7; (animal) pl. U.U. f.3. 
Animal, when fully extended, of an elongated oval shape. 
The upper or tentacular lobe, and that of the foot, with its 
reflected portions, are of a pale yellow, aspersed with very 
minute, close-set, sand-like, dark mouse or lead-coloured 
poimts throughout their external surface; the spots on that 
part of the mantle covered by the shell are larger and of 
intenser hue, so that the animal has altogether the aspect of 
bemg clothed in a close-sprinkled pepper-and-salt jacket. 
The sinus around the body, which divides the upper and lower 
lobes, is of a pale yellowish-white colour. The tentacular 
lobe of the head is small, of subquadrangular form, a little 
narrowed behind, where, as well as in front, it is gently 
sinuated, with slight emargimations at the centre of both 
ends, which by no means give their right and left extremities 
any pretension to be styled four tentacula, agreeably to M. 
Cuvier’s view. The true mantle extends to the posterior part 
of the tentacular lobe, with its thickened rounded margin 
swelling out a little beyond the periphery of the aperture of 
