484 MUKICID^E. 



M. ISLANDICUS, Chemnitz. 



Fusus Islandicus, Brit. Moll. iii. p.416,pl.l03. f.1,3; (animal) pi. S.S. 

 f. 2. 



M. PROPINQTJUS, Alder. 



Fusus propinquus, Alder. 



, Brit. Moll. iii. p.419, pi. 103. f. 2; (animal) pi. S.S.f.l. 



Notwithstanding the variation in the apex of M. Islandicus 

 and M. propinquus, their distinctness may be doubtful. 



Sectio III. Testa inflata, varicosa vel leevis, seepe spiraliter granoso-un- 

 dato-striata. Canalis brevis. Apertura ovalis. Columella fastigiata. 

 Operculum corneum. 



BUCCINUM, Auctorum. 

 M. UNDATUS, Linnaeus. 



Buccinum undatum, Brit. Moll. iii. p. 401, pi. 109. f. 3,4, 5 ; pi. 110. 



f. 4 ; (animal) pi. L.L. f. 5. et omnium Auct. 

 B. Humphreysianum, Bennet, et Brit. Moll. iii. p. 410, pi. 110. f. 1. 



Animal with eight spiral turns, of a pale yellow ground 

 colour in all parts, sparingly interspersed with irregular dark 

 blotches on the upper part of the foot, the tentacula, and 

 branchial fold. The mantle is of thin texture, and no portion 

 of it extends beyond the shell, except the branchial fold, which 

 when in action floats far beyond the emargination of the shell, 

 for only slight traces of a canal remain. The head is small, 

 compressed, not at all produced, and does not in the least 

 interfere with the coalition of the tentacula at their bases; 

 these are long and flattish, broad at their origins as far as the 

 eyes, which are placed on shortish external offsets, and the 

 remaining portion terminates in rounded but not pointed 

 extremities. The mouth is a vertical central fissure rather 

 below the surface of the head, and from it a very long and 

 powerful proboscis is exserted, armed with the usual spinous 

 tongue. The foot is large, broad, and about as long as the 

 shell, slightly auricled and curved in front, and rounded pos- 

 teriorly to an obtuse point; on its upper part it carries a 

 comparatively small, but strong, light corneous, suboval oper- 

 culum, having the striae of increment of the same form, with 

 the nucleus about the middle of its outer edge. There are 



