528 BULLID/E, 



Bosc, Hist. Nat. Coqnil. vol. iv. p. 69. — Gratel. Sur Ics 

 Bull, (and in Bullot. Bordeaux), p. 14, var. a. 

 Bulla 7-esilietis, DoNov, Brit. Shells, vol. iii. pi. 79. 



„ Jrai/Uin, Lam. Anim. s. Vert. (ed. Desh.) vol. vii. p. 672. — Blainv. Man. 

 Malacol. pi. 45, f. 7. — Cuvier (ed. Henderson), pi. IG, tert. 

 f. 6. — Penny Cyclopad. vol. vi. figure at p. 12. — Sowerbv, 

 Conch. Man. f. 247. 

 Ahra JlexUh, Brown, Hlust. Conch. G. B. p. 59, pi. 1!), f. 31, 32. 

 Jiidla {Ahera) IjulUda, A. Adams, Sow. Thesaur. Conch, vol. ii. p. 572, pi. 121, 

 f. 41. 

 „ „ Ilanlcyi, A. Adams, Sow. Thesaur. Conch, vol. ii. p. 573, pi. 121, 



f. 46. 



Tlie shape of this horn-coloured shell ranges from oval 

 to rounded oval, the form being usually more produced in 

 such individuals as have an elevated spire. The texture is 

 very thin, somewhat membranaceous, and when fresh-taken 

 even elastic ; the surface is glossy, and smooth to the eye, 

 but in reality is most densely set with minute spiral striula?. 

 The body which is tumid, and simply rounded, not being re- 

 tusely indented, although it appears to closely embrace the 

 preceding volution, is nevertheless severed from it above, 

 by a narrow fissure, which runs parallel to the suture, at a 

 little distance from it, along the highest part of the body, 

 so that only a kind of ledge, which, indeed, is wholly cut 

 away for a considerable space near the outer lip, is actually 

 attached to the preceding coil. This ledge, when the 

 crown is sunken or level, shelves inwards ; when it is a 

 little raised (which is rarely the case in the largest 

 examples), is then nearly horizontal ; hence the volutions 

 are angulated above, and their tops are either flat, retuse, 

 or subcanaliculated ; the sides of the whorls are rounded 

 up to the angle, and frequently lean, as it were, over the 

 subscalar portion. From the rapidity of the volutional 

 increase the aperture is ample, occupying about one-half 

 of the ventral area; it is of an oblique and elongated pear 



