788 CLASS xni. 



Sp. Accra carnosa Cuv., Ann. du Mus. 1. 1. p. 10, PI. I. figs. 15 19, Mem. 

 s. 1. Moll. 1. 1. PI. 2, figs. 1519, X. Ani, ed. ill., Moll PI. 35, fig. 2. See 

 on another species from the Mediterranean, CANTRAINE op. cit. pp. 73, 74. 



Sulla L. (in part), BEUG. Velum of head large, separated from 

 mantle by a transverse furrow, in some produced into four lacinigc 

 or tentaculiform appendages. Vent, orifice of generation, branchiae 

 and heart placed at the right side. Foot shorter than body, with 

 lateral margin produced, undulato-plicate. Shell thin, convolute, 

 with aperture large. 



Bullcea LAM. (Philine A SCAN., Lobaria MUELL., GMEL., species of 

 Bulla L.). Shell very thin, concealed, not affixed by muscles, with 

 very wide aperture, and lip alone slightly involute. 



Sp. Bulla aperta L., GM. (in part), Lobaria quadriloba MUELL., GMEL., 

 MUELLER Zool. Danic. Tab. 100, figs, i 5, Cuv. R. Ani., ed. ill, Moll., 

 PI. 35, fig. i ; in the Mediterranean and North Sea. 



Bulla LAM. (Scaphander MONTF., Alicula EHRENB., &c.) Shell 

 external affixed by muscles, involute, with spire little exsert or 

 depressed. 



Sp. Bulla ampulla L., RUMPH. Amb. Eariteitk. Tab. 27, fig. G, BLAINV. 

 Malacol. PI. 45, fig. 12 ; the apex is somewhat projecting in Bulla Aplustre 

 (Bulla Amplustre L.), Encycl. meth., Vers. PI. 359, fig. 2, BLAINV. Malac. 

 1. 1. fig. 10, &c. There are also fossil species of this genus, almost all 

 from the tertiary formations. 



Note. Posterobranchcea D'ORBIGNY. A genus related to the 

 Acerce, shell none, but differing from its congeners by the branchiae 

 placed on the left side. 



Sp. Poster obr. maculata D'ORBIGNY, Voyage dans FAmer. me"rid. (reprinted in 

 OKEN'S Isis, 1839, pp. 526, 527; comp. also TROSCHEL, WIEGM. Archiv, 

 1838, n. p. 282). 



The new genera Lobiger and Lophocerus KROHN, if indeed they 

 belong to this family, must as it seems be placed near Aplysia. 



Comp. KROHN, sur deux nouveaux genres de Gasteropodes, Ann. des Sc. 

 not. 36 SeVie, vn. pp. 52 60, PI. n. 



Family VII. CydobrancJiiata. Gasteropods with branchiae 

 foliaceous or pyramidal, arranged in rows on each side under the 

 margin of mantle. Sexual organs without organs of copulation. 



