PLATE I. 



Ammonites banhsii, J. Sowerby, Min. Conch., vol. ii, p. 220, 1818, pi. cc. 



[Brit. Mus. no. 43910.] 



" Specific Characters. — Discoid, very thick ; inner turns exposed ; sides concave, 

 largely tuberculated ; front fluted, slightly convex ; aperture transverse, almost 

 three times as long as wide. 



" A very bold formed shell ; the narrow sides of the whorls are much relieved 

 from each other, they are convex, and occupied by about 10 large obtuse tubercles: 

 the great width of the convex margin, which is obtusely fluted, gives the whole a 

 very massive appearance. There are about five turns, the last but one is in 

 diameter equal to the thickness of the whole. 



" In a valuable packet of fossils belonging to the Inferior Oolite, sent by some 

 disinterested friend at present unknown to me, from the west of England, was the 

 ponderous mass represented in this plate; it contains the ferruginous grains 

 peculiar to that rock, with Belemnites, fragments of other shells, and also a piece 

 of wood, changed almost into charcoal. I hope my friend will make himself 

 known, and communicate the locality. 



" I have indulged my feelings of esteem and friendship, by giving this 

 magnificent Ammonite the name of that staunch supporter of science in general, 

 and of natural history in particular, who has presided so long and so ably over 

 the Royal Society." 



[See also PL III, fig. 2.] 



