446 BULLION. 



Of the last-named species I obtained a very young 

 specimen in my Shetland dredgings. S, librarius is 

 much smaller than S. lignarius, of an oval shape, 

 having the spire compactly coiled, and the mouth con- 

 sequently more contracted. It inhabits the Scandina- 

 vian coasts, in from 20 to 150 f., and (fide Torell) 

 Iceland. 



Genus VII. PHILI'NE*, Ascanius. PL VIII. f. 7. 



BODY semioval, gelatinous and slimy, not containable 

 within the shell : mantle shield- like, covering the shell and 

 gill-plume : head oblong, wedge-shaped in front : tentacles not 

 distinct, but forming part of the head : eyes wanting : foot 

 broad, folded on each side as a flap, which together with the 

 pallial disk and head give the animal a quadrilobate appear- 

 ance : gizzard composed of three calcareous plates, which in 

 some species are shuttle-shaped and eqnal in size, and in 

 other species are similar to those of Scaphander : odontophore 

 without any rhachis or central tooth ; the uncini are claw- 

 shaped, and arranged in single or double file. 



SHELL wholly internal (being concealed under the mantle), 

 and thin : spire loosely coiled, small, and truncated : mouth 

 very large and open, not always as long as the spire : pillar 

 sharp -edged, flexuous, and visible throughout. 



A description and figure of this genus by Professor 

 Ascanius were published in the 33rd volume of the 

 Transactions of the Royal Academy of Sciences at 

 Stockholm for 1772, the species on which it was 

 founded being the Bulla aperta of Linne. The ' Zoo- 

 logical Journal' for 1827 contains a valuable and in- 

 teresting account by Mr. Clark of several British species 

 which he examined in a living state. 



* Possibly from " le Philin " of Adanson, a fancy name, applied by him 

 to a species of Cymbium. It should be Phylline, if derived from the 

 leaf-like appearance of the shell ; but that name was given by Okeu to a 

 genus of parasitic Annelids. 



