144 PYRAMIDELLID.E. 



A monstrous specimen, from Guernsey, of this com- 

 paratively rare species has a remarkably thick and 

 strong varix or rib-like callosity in the middle of the 

 body- whorl. Mr. Alder noticed the striae on the typical 

 form. 



This species may be the Auriculina exilissima of Bru- 

 sina, from Melada in Dalmatia. 



-~)M.. 19. O. DOLIOLIFOR'MIS*, (Jeffreys.) N? 444 



0. dolioliformis, Jeffr. in Ann. & Mag. N. H. 2nd ser. ii. p. 342 ; F. & H. 

 iii. p. 301, pi. xcvii. f. 5. 



BODY hyaline pale azure : mantle slightly channelled at the 

 upper angle of the shell on the right side : snout considerably 

 in advance of the foot when the animal is in active motion, 

 scarcely extending to its front edge when at rest: tentacles 

 proportionally larger than in other species, not so triangular, 

 nor furnished with such broad lateral membranes, nor do they 

 coalesce so decidedly as in other species to form a veil ; the 

 tip of eaofr has a point of flake-white : eyes as usual : foot ap- 

 parently divided into two parts ; the anterior or front portion 

 is constricted, slender, attenuated, and very extensile, slightly 

 auricled and notched, and nearly clear white ; the posterior 

 or hinder portion is somewhat oval, short, broad, fleshy, of an 

 opaque pale drab, and divided in the middle by a deep longi- 

 tudinal fissure or groove, that seems almost to separate this 

 portion into two equal lobes, which terminate together in a 

 rounded point with a narrow central notch. (Clark.) 



SHELL oval, resembling Dolium perdix in shape, rather thin, 

 semitransparent, and somewhat glossy: sculpture, about 20 

 remote and sometimes wavy spiral striae, which are almost 

 perceptible by the naked eye ; the microscopical lines of growth 

 are numerous and very slight ; these do not cross the striae, 

 nor impart any " quasireticulated " appearance, as noticed by 

 Mr. Clark : colour whitish, with a faint tinge of yellow in live 

 specimens : spire remarkably short ; nucleus twisted horizon- 

 tally in different directions : whorls 3 only, besides those of 

 the nucleus or apex ; they are ventrico3e,Hbut compressed to- 

 wards the suture and front edge, and suddenly enlarge ; the 

 last occupies nearly the whole of the shell when viewed with 



* Having the aspect of a small species of Dolium. 



