BULLA. 481 



f. 9. Born Mus. p. 202. Schroeter Einl. i. p. 175. 

 Gmelin, p. 3425. Humphreys in Lin. Tram. ii. p. 15. 

 t. 2. f. 18. Schreibers Conch, i. p. 86. Montagu Test. 

 p. 205. Bruguiere in Erie. Method, p. 378. Maton 

 and Racket, in Lin. Trans, viii. p. 125. Dorset Cata- 

 logue, p. 43. t. 23. f. 9. 

 Bonanni Rec. Supp. f. 16, and Kirch. 3. f. 406. iz'sfer 

 Cowc/«. t. 714. f. 71. It/wrr, vi. t. 37. f. 4 and 5. Enc. 

 Method, t. 359. f. 3. 

 Inhabits the Adriatic Sea. Plancus. Syracuse. Klein. Coasts 



of Naples. Ulysses. Great Britain. Pennant, %c. 

 Shell usually about two inches long, and one and a quarter 

 broad at the base, very brittle, and yellowish brown, with 

 numerous transverse stria; of a lighter colour, which give it 

 some resemblance to veined wood ; the aperture at the base 

 is wide, but becomes narrower towards the apex, which 

 is umbilicated, and exhibits the columella throughout its 

 whole length ; the inside is white. Mr. Humphreys, in the 

 Linmean Transactions, has given a particular account of the 

 masticatory organs which he has discovered in this species, and 

 similar organs have since been found in several others of this 

 family. These Gizzards have themselves so much the appear- 

 ance of small shells, that they have been described as such 

 by M. Gioeni, a Sicilian Naturalist, and formed into a sepa- 

 rate genus of Testacea by Bruguiere with the name of Gice- 

 nia, and also by Retzius with that of Tricla. 



pectin ata. 21. Shell ovate, rough, with the 

 aperture pectinated at its base; apex trun- 

 cated. 



Bulla scabra. Mtdler Zool. Danica, ii. p. 41. t. 71. f. 10 

 to 12. Bruguiere in Enc. Meth. p. 376. t. 360. f. 3, a, 

 b, and c 



Inhabits the coasts of Denmark. Mailer. 



Shell about a quarter of an inch long, and half as broad ; yel- 

 lowish, rough to the touch, and the roughness occasioned by 

 moniliform striae, which are only to be distinguished with a 

 glass. This species differs from all others, and may be rea- 

 dily known by its having the lower margin of the aperture 

 strongly pectinated. The shape bears some resemblance to 

 that of B. lignaria. Muller and Chemnitz in the same year 

 described two very different shells with the name of B. sca- 

 bra, and as neither has the preference on the score of priori- 

 ty, I have changed the name of the present species, because 

 it offers another which is peculiarly applicable. 



vol.i, 2i 



