( 08 ) 



DESCRIPTION OF PLATE I.* 

 I. RECENT SHELLS.— NEW SPECIES. 



] . pusus boothii. n. s. — Smith. 

 Plate I. Fig. 1 . 



Shell strong, with eight deeply defined, well rounded volutions, 

 tapering to an acute apex, provided with numerous slightly oblique, 

 strong, longitudinal ribs, which, together with the interstices, are 

 crossed by close-set, strong, spiral striae, between most of which are 

 finer striae, giving the shell a lamellated aspect ; suture of the spire 

 broad, concave, and not crossed by the ribs, but spirally striate ; 

 aperture oblong-ovate, a little narrowed above, smooth, white, and 

 furnished with two longitudinal, purple belts, leaving the margin 

 next the outer lip white ; pillar-lip white, smooth, with a slight lon- 

 gitudinal groove near its external margin, and furnished with a 

 brownish-purple spot above ; outer lip thick, flattened on the edge, 

 with a zigzag groove in its centre, and a slightly rounded sinus above, 

 at its junction with the body ; outer margin crenated ; canal short 

 and wide ; external surface of a deep chocolate-brown ; length five 

 and a half eighths ; breadth somewhat more than a quarter of an inch. 



This beautiful shell was dredged in Rothesay Bay, by James Smith, 

 Esq. of Jordanhill, and, with it, the fragments of a shell of the same 

 species, measuring upwards of three-eighths of an inch in diameter, 

 so that this shell must attain the size of nearly an inch. 



It differs from Fusus purpureus in having fewer volutions, in the 

 spire being shorter, and not quite so taper, in the thickness and cha- 

 racter of the outer lip, and in being destitute of the striae inside the 

 aperture. 



Named in honour of Henry Gore Booth, Esq. In the Andersonian 

 Museum, Glasgow. — B. 



2. FUSUS UMBILICATUS. N. S. — Smith. 



Plate I. Fig. 2. 



Shell with seven, turreted, deeply-defined volutions, tapering ab- 

 ruptly to an acute apex ; volutions obliquely flattened above ; body 

 provided with seven strong, transverse ribs, and the volutions of the 

 spire with three each ; ribs and interstices crossed by fine, oblique, 

 longitudinal strisa, which are hardly visible without the aid of a lens ; 



* The descriptions marked B, I owe to Mr T. Brown, and those marked 

 F, to Mr Edward Forbes. 



