14 Dr. Mantell on the Structure of the Belemnite. 



pairs of buccal ganglions ; g, ditto uniting upper buccal ganglions 

 to anterior subcesophageal ; h, ditto uniting upper buccal ganglions 

 to optic ditto ; i, optic ganglions ; j, optic nei-ves ; k, enlargement of 

 same at back of eye; I, small round ganglion attached to optic nerve; 

 m, two pairs of nerves from same ; n, visceral ganglion ; o, branchial 

 ditto ; /J, jo, cords or commissures from same to stellate ganglions ; 

 q, visceral nerves ; q', q', nerves to the mantle ; r, pair of visceral 

 nerves applied to intestine, and tube of ink-bag ; s, small ganglion 

 at origin of this pair of nerves ; t, another pair of visceral nerves 

 supplying the anterior vena cava ; u, ganglion on the wall of vena 

 cava ; v, v, branchial nerves, each exhibiting a ganglionic swell- 

 ing v' ; w, w, genital nerves ; x, nerve supplying systemic and 

 branchial hearts and posterior aorta ; y, cord or commissure uni- 

 ting gastric ganglion to that on vena cava ; z, gastric ganglion ; 

 A, nerve to spiral stomach ; B, B, B, nei-ves to gizzard ; C, C, ditto 

 to pancreatic organ; D, ditto to pylorus; E, ditto to cardia; 

 F, F, oesophageal nerves or par vagum. 



Fig. 2. Under view of anterior subcesophageal and optic ganglions : — a, an- 

 terior mass ; b, under commissure connecting same to median ; 

 c, c, upper ditto ; d, upper buccal ganglions ; e, e, nerves supply- 

 ing the outer buccal capsule ; /, commissure between same and 

 lower buccal ganglions ; g, commissure from upper buccal gan- 

 glions to anterior subcesophageal mass ; h, ditto from optic to 

 upper buccal ganglions ; i, optic ganglions ; j, j, optic nerves ; 

 I, I, small round ganglions on same ; m, m, brachial nerves ; n, two 

 pairs of nerves to muscles in front of eyes. 



Fig. 3. Upper view of optic ganglions: — i, optic ganglions; j,j, optic 

 nerves ; it, k, enlargement of same at back of eye ; I, small 

 round ganglions on optic nerves ; m, m, nerves from same to skin 

 of head above and behind ; n, n, filaments from optic nerve ap- 

 plied to back of eye ; o, eye. 



Fig. 4. Otolithe from auditory sac. 



II. — A few Notes on the Sh'ucture of the Belemnite. By Gideon 

 Algernon Mantell, Esq., LL.D., F.R.S., President of the 

 West London Medical Society, &c. 



To the Editors of the Annals of Natural History. 



" Dr. Mantell, who has adopted Mr. Channing Pearce's generic 

 name of Belemnoteuthis for some of these fossils (Belemnites), seems 

 to be disposed to detract from the merit of their anatomical restora- 

 tion, for which the Royal Society awarded the Royal Medal to Pro- 

 fessor Owen in 1848, affirming that the true characters of the animal 

 of the Belemnite have yet to be discovered. But he forgets that a 

 change of name does not change the essence of a thing, and that the 

 essential character of a Belemnite is the ph?'agmocone." — From the 

 Article entitled "Progress of Comparative Anatomy," Quarterly 

 Review, March 1852, p. 383. 



Gentlemen, 

 The personal imputation, the mystification of the point at issue, 

 and the misstatement respecting the late Mr. Channing Pearce, 



