PLATE II. 



Ammonitts hlagdeni, J. Sowerby, Min. Coiicli., vol. ii, p. 231, 1818, pi. cci. 



[Brit. Mus. no. 43908.] 



" Specific Characters. — Subcyliudrical, obtusely fluted, umbilicate ; umbilicus 

 reaching to the margin, conical, with large radii terminating upon the edge in a 

 tubercle ; aperture transverse, quadrangular, three times as wide as long. 



" The iimbilicus is deep ; it occupies the Avhole side ; the tubercles round its 

 edges, about 22 in each turn, are obtuse in the cast of the inside, but where there 

 are some remains of the outer surface they appear to be spiniform, there are four 

 or five furrows on the front to each ; the front is very slightly convex. 



" A massive specimen from the lower Oolite, containing Belemnites, other 

 Ammonites, etc. : it was given to me by my lamented friend. Dr. J. C. Lettsom. 

 I have named it after the highly discerning, meritorious, yet most unassuming 

 Sir Charles Blagden. The analogy between this and the preceding may remind 

 conchologists of the long cordial friendship subsisting between Sir Charles and Sir 

 Joseph Banks." 



[See also PI. Ill, fig. 1.] 



