430 BULLID^. 



AcERA bulla'ta*; Mliller. 



Akera hullata, Miill. Prodr. Zool. Dan. p. 242, no. 2921 ; F. & H. iii. 

 p. 527, pi. cxiv. D. f. 4-6, and (animal) pi. YY. f. 6. 



Body varying in colour from greyish or nearly clear white 

 to pale yellowish-white or orange, covered with minute and 

 numerous flake-white or dark specks, and usually streaked in 

 front with interrupted lines of purplish -brown : mantle spread 

 over the underside of the shell, and partly over the spire or 

 crown : head, when the animal is crawling, attenuated, and 

 sheathed underneath by the side lobes of the foot ; it is wedge- 

 shaped and bilobed in front (so that occasionally the corners 

 assume the shape of ears or tentacles), and margined by a 

 narrow purplish-brown line : eyes small and black, but always 

 perceptible : foot oblong, swollen at its base ; side lobes or flaps 

 slightly tuberculated ; front rounded and narrower than the 

 posterior portion, where the foot dilates and is truncated at 

 the extremity, with angular corners : \odontopliore, rhachis 

 minute, erect, broader at the base, which is produced on each 

 side, having the top expanded and compressed on the upper 

 part, the cutting-edge bent downwards and one-cusped, with a 

 notched crest on each side; uncini about 21, forming long 

 hooks which are longer in the middle row, the first furnished 

 on the inner side with short wings and jagged, the rest always 

 more slender (Loven) :] gizzard composed of a dozen triangular 

 plates. 



Shell forming a short oval, dilated in the middle, and almost 

 equally broad at each end, semitrausparent and glossy : scidp- 

 ture, extremely fine, close-set, and wavy microscopic spiral 

 strise, which pervade the whole surface : epidermis filmy but 

 distinct, brownish-j'ellow of diff'erent shades : colour, under 

 the epidermis, whitish with sometimes a faint tinge of green : 

 spire truncated, sometimes slightly prominent : ivliorls 6, ridged 

 or keeled at the top ; the first is globosely oval and intorted : 

 suture deep and channelled, with sloping sides ; it is slit or 

 narrowly open in front for a considerable distance, so as to 

 disconnect the outer part of the body-whorl from the preceding 

 whorl, and to make the shell elastic when held between the 

 thumb and fingers : mouth somewhat contracted above, and 

 very wide below, with a rounded base ; it extends nearly the 

 whole length of the shell : outer lip flexuous. folding inwards 



* Inflated." 



