228 PYRAMIDELLID^. 



StyUfer.* Mr. Alder informs us tliat it occurs on young 

 sea-urchins. The exotic species bury themselves in the 

 skins of star-fishes. 



EULIMA. Risso. 



Shell elongated, lanceolate or subulate, surface smooth, 

 polished; spire produced, many-whorled, apex acute; mouth 

 ovato-pyriform, pointed above, rounded below ; pillar-lip 

 gently curved, smooth ; pillar imperforate ; operculum sub- 

 pyriform, corneous, imperfectly spiral. 



Animal with two subulate tentacula, having conspicuous 

 eyes immersed at their posterior bases, which are approx- 

 imated ; mouth furnished with a long retractile proboscis ; 

 tongue unarmed ; foot linguiform, produced in front, where 

 it is truncated, and doubled above the frontal margin by a 

 bilobed mentum or fold ; the operculigerous lobe developed 

 at the sides into more or less ample even-edged unequal ex- 

 pansions or lobes. Branchial plume single. Mantle with a 

 rudimentary branchial fold. Male organ small, flat, falcate. 

 All the animals of this genus creep with the foot greatly in 

 advance of the head, which is almost always concealed be- 

 neath the edges of the aperture of the shell, the tentacula 

 only protruding. 



More by chance than through knowledge, Risso, whose 

 writings have done much to confound and obscure mala- 

 cology, proposed a good genus in Eulima, a group of mol- 

 kisks remarkable for the beauty and delicacy of both their 

 hard and soft parts. Species are now known from most 

 seas, and as the deeper waters are more and more sub- 

 mitted to exploration the number will doubtless be consi- 



* Mr. Jeffreys informs us that the Slyliiia stylifera of Macgillivray (Moll. 

 Aberd. p. 343) was described from a young exotic, Bulimus (!) that had been 

 picked up with Columbclla mercatoria. 



