84 



Tin's fliell we found in the Boyfian cabinet. It is nearly 

 cylindric, with five articulations, and feven longitudinal ribs ; 

 one end is truncated, the other is terminated by a flender 

 cylindric procefs as long as the firfl: joint. Length one 

 tenth of an inch. 



In this fpecimen we find the produced point at one end 

 is not the aperture or fyphon, but is folid fliell ; the open- 

 ing is at the truncated end, which may poffibly be imperfedt, 

 or in this particular may alfo vary. 



Another variety has been difcovered by Mr. Henry Boys 

 amongfl: his father's fliells, (a drawing of A\hich we have 

 been lately fiivoured with) that has five articulations, and 

 four ribs ; ill other refpedli^ lik^ th^t above defcribed. 



i.) 



It fliould however be remarked that thefe, independent of 

 the want of the conic anterior end, have not that gradual 

 taper fliape delcribed, and figured for the original cdjlalus. 



If this fliould really be a variety of that fliell, poffibly the 

 Ramphaniis, Lin. Syji. p. II 64, may alfo be a variety; 

 the Orthoceras minmwn of Gualieri, Tab. 19, L. L. M. 

 originally given by Plancus, Tab. i, fig. 6, and copied, by 

 Martini, i. vig. l- fig. A. a. B. c. Thefe figures are more 

 taper, poflef? more ribs than any we have feen, and are 

 rounded at the f mailer end ; the larger end has a produced 

 fyphon, round which is a fcalloped margin, formed by the 

 ribs. 



Another 



