c\4i Dr. Mantell on the Structure of the Belemnite. 



b9f0-j. pairs of buccal ganglions; g, ditto uniting upper buccal ganglions 



to anterior subcesophageal -, h, ditto uniting upper buccal ganglions 



U» to optic ditto ; i, optic ganglions J J, optic nerves ; A:, enlargement of 



9111 JJi same at back of eye ; I, small round ganglion attached to optic nerve ; 



Oflt 8 A rriy two pairs of nerves from same ; n, visceral ganglion ; o, branchial 



taoi ditto ; p,p, cords or commissures from same to stellate ganglions ; 



,.<jjt 9> 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 



^ J ^''■■^ supplying the anterior vena cava ; u, ganglion on the wall of vena 



Off J io B~ cava; v, v, branchial nerves, each exhibiting a ganglionic swell- 



-loM to iiig^'j 'iv, w, genital nerves; x, nerve supplying systemic and 



c jL } j branchial hearts and posterior aorta; y, cord or commissure uni- 



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



3UJ III V ^^ nerve to spiral stomach ; B, B, B, nerves 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- 



y ^'^ terior mass; b, under commissure connecting same to median; 



gaamiOO ^^ ^^ upper ditto ; d, upper buccal ganglions ; e, e, nerves supply- 



onw ^3t i ing the outer buccal capsule ; /, commissure between same and 



<_nofjid!d lower buccal ganghons ; g, commissure from upper buccal gan- 



ndi moi S^^^^* ^ anterior subcesophageal mass; h, ditto from optic to 



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



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



Dfts o tr> pairs of nerves to muscles in front of eyes. 



{ji%§&oUpper view of optic ganglions : — i, optic ganglions ; j, j, optic 



-dahfirfO nerves ; h, 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- 



Vns Xfio plied to back of eye ; o, eye. 



Fig. 4. Otolithe from auditory sac. 



II. — A few Notes on the Structure of the Belemnite. By Gideon 

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

 ^,^,^West London Medical Society, &c. 



ijj To the Editors of the Annals of Natural History, '/ - 



i;'r^^*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 phragmocone." — 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, 



