GASTEROPODOUS MOLLU8CA OF BERWICKSHIRE. 235 



is a bag of a similar form, but the coat of which is thin and pellucid, and 

 contains at first a fluid granular matter, clouded at places, and ultimately 

 ('nun two to four young. Previous to exclusion these are perfectly form- 

 ed : the eyes, tentacula, and operculum of the animal are very distinct, 

 and tin- shell, which is of a uniform flesh-colour, has three or fourwhorln, 

 and is fully four lines in length. They ultimately make their cM-ape by 

 a dissolution or rupture of the cells, for there is no aperture in the inner 

 coat, and the slit in the outer one seems intended merely to admit the 

 r necessary to their airing. 



2. F. corneus, shell fusiform, plain, covered with a brown epidermis, 

 striated spirally ; whorls nine, somewhat rounded ; aperture ob- 

 long,pure white, with smooth lips; canal rather short, bent, wide. 

 Length 3 ; breadth 1 inch. Flem. Br. Anim. 348. F. islandicus, 

 Lam. Anim. s. vert. vii. 126. Murex corneus, Linn. Dillw. Rec. 

 Sh. 733. 



JIab. Berwick Buy, in deep water, frequent. 



Animal white, unspotted ; eyes black and rather large; foot short, very obtuse 

 behind, the margins plain. 



3. F. Bamfius, shell fusiform, dirty white, with seven convex whorls 

 ribbed across; ribs numerous, acute or lamellar; aperture oval, 

 white, with a bent canal shorter than its length, the outer lip 

 thickish and everted. Length ^ths ; breadth ^ths. Flem. Br. 

 Anim. 351. Murex Bamffius, Penn. Brit. Zool. iv. 284, tab. 82, 

 fig. 5. 



Hub. Berwick Bay, in deep water, rare. 



4. F. Barvicensis, shell fusiform, white, with six rounded whorls 

 separated by a flattened space at the suture, and crossed with 

 numerous furbelowed ribs; aperture roundish, white, the canal 

 rather long, slightly ascending; outer lip thin, smooth. Length 

 ," u ths; breadth Aths. Johnston, in Edin. Phil. Journ. xiii. 225. 

 F. asperrimus, tirown's Conch, pi. 47, fig. 2. 



//--/.. Berwick Bay, in deep water, rare. 



There are thirteen ribs on the body-whorl, finely furbelowed, projecting a lit- 

 tle at the suture, and terminating on the beak, which is produced and 

 smooth towards its extremity. In the space between the ribs there are 

 some obsolete spiral elevations. The ribs do not terminate at the suture*, 

 but are continued across the flattened space by elevated stria?. 



Mr J. E. Gray informs me, that this shell is not distinct from the Murex mu- 

 ricatus of Montagu; and relative to this opinion, Mr J. Alder of N \\ 

 castle has favoured me with some remarks, which 1 shall give in his own 

 words. He says " They are very nearly, if not exactly, similar in form, 

 but in none of the specimens of F. muricatus, is there any appearance of 

 the beautifully uiululat ing bilaminated ribs which are so" conspicuous in 

 your shell. These may possibly wear off, like the imbricated scales of 

 the young Purpura lapillus , but Montagu dredged up M. muricatus, cover- 

 ed with an i -range-coloured epidermis or crust, ; ml probably fresh; and 

 it has been often found since his time, but nobcdy has ever described it 

 with undulated lamellar ribs, which I think must have been observed had 

 i hey existed. The tubereuluted appearance, from the strong xpiral stria* 

 crossing the ribs, seems to be a general character of M. muricatus, but 

 can scarcely apply to yours. Indeed, F. Bwioenttl cannot properly U- 



