GASTEROPODOUS MOLLU80A OF BERWICKSniRE. 235 



there 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 ulti- 

 mately from two to four young. Previous to exclusion these are perfectly 

 formed : the eves, lentacula, and operculum of tlie animal are very distinct, 

 and the shell, which is of a uniform flesh-colour, has three or four whorls, 

 and is fully four lines in lengtli. They ultimately make their escajje 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 

 water necessaiy to their airing. 



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



sti'iated spiivilly ; whorls nine, somewhat rounded ; aperture 

 oblong, 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, Zinn. 

 Dilhc. Eec. Sh. 733. 



Sah. Berwick Bay, iu deep water, frequent. 



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

 behind, the margins plain. 



3. F. Bamfias, shell fusiform, dirty white, with seven convex whorla 



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

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

 thiekish and everted. Length -1^5-ths ; breadth iVths. Flem. Br. 

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

 fig. 5. 

 Hah. Bei'wick Bay, in deep water, rare. 



4. F. Barvtcensi-f, 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 

 i^ths; breadth r.rths. Juluisfon, in Edin. Phil. Journ. xiii. 225. 

 F. asperiimus, Brou-ii's Conch, pi. 47, fig. 2. 



Hah. Berwick Bay, in deep water, rare. 



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

 at the suture, and terminating on the beak, wliich is produced antl smooth 

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

 obsolete spir;il elevations. The ribs do not terminate at the sutures, but 

 are continued across the Haftened sj^sico by elevated strife. 



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

 catus of Montagu ; and relative to this opinion, Mr J. Alder of Newcastle 

 has favoured me with some remarks, which I 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. mnricatns, is there any appearance of the 

 beautifully nndiiliiHng bilaminatod ribs which are so consjn'cuotis in your 

 shell. These may ]i()ssil>ly wear off, like the imbricated scales of the 

 young Purpura hipillus; but Moutagtt dredged up M. muricatus, covered 

 with an orange-coloured epiilermis or crust, and probably fresh ; and it 

 has been ofteu found since his lime, but nobody has ever described it with 

 undulated lamellar ribs, which f think must have been observed had they 

 existed. The tuherculated appearance, from the strong spiral stria) cross- 

 ing the riVis, seems to be a general chai-acter of M. muricatus, but can 

 scarcely apply to yours. Indeed, F. Barvicensis cannot properly be said 



