440 BULLIDvE. 



B. Solid; crown perforated and exposing part of the spire. 

 RdX 



^r- 2. B. 



B. utriculus, Brocchi, Conch, foss. Subap. i. p. 633, t. 1. f. 6 a, b. B. 

 Cranchii, F. & H. iii. p. 533, pi. cxiv. D. f. 8, 9, and (animal) pi. VV. 

 f. 2. 



BODY greyish- white, faintly tinged above with brownish- 

 yellow : mantle thick, protruded behind, and folding over the 

 crown of the shell as well as partly over its underside : head 

 very large and flexible, wedge-shaped in front : tentacles tri- 

 angular or ear-shaped, turned back over the front of the shell, 

 and covering nearly one-third of it : eyes, none perceptible : 

 foot squarish, truncated in front, rounded behind, and forming 

 on each side a broad triangular flap, which is folded over part 

 of the head and tentacles : ovary yellow, visible through the 

 shell. 



SHELL oval, with a tendency to become cylindrical, rather 

 solid, semitransparent and glossy : sculpture, numerous spiral 

 striae or impressed lines, which are visible to the naked eye ; 

 towards each end they are stronger, and alternately large and 

 small (sometimes two or three smaller striae between two of 

 the larger size), and they are throughout closely punctate in 

 consequence of the interstices being crossed by fine longitudinal 

 striae ; the spiral striae are much slighter in the middle of the 

 shell, which in the young is usually quite smooth : epidermis 

 reddish-brown; it is chiefly persistent on the spiral striae, 

 which are therefore darkly lineated : colour pale yellowish or 

 creamcolour, occasionally milk-white : spire partly exposed ; 

 crown perforated, and obliquely encircled by a thick angular 

 rim : mouth as in the last species, but narrower ; its length 

 exceeds that of the spire : outer Up not much curved in the 

 middle, nor folding inwards ; it projects a little beyond the 

 crown : inner lip slight : pillar short, thick, and flexuous ; at 

 its base is a rather strong fold, which makes the lower part 

 of the mouth appear channelled ; behind the pillar is a small 

 and groove-like umbilicus. L. 0*5. B. 0*3. 



Var. oblonya. Smaller, longer in proportion to its breadth, 

 and more cylindrical. 



HABITAT : Muddy sand in 20-86 f., Plymouth (Pri- 



* A husk of grain. 



