REFERENCE TO PLATES. 297 



FIGURES. PAGE. 



rows of teeth and an unarmed row of plates on either side ; 

 those of the median row have three fangs, of the next on 

 either side two fangs, whilst the two outer rows on both sides 

 are simple, acute and strongly curved. 



7. Sepia officinalis. Troschel, ibid., f. 7. 



8. Sepia Orbignyana. Targioni, 1. c., t. 7, f. 2. 



Plate 7. 



1. Circulation of Eledone moschata. Keferstein, t. 117. f . 2 35 



J. Siphon. A. Elevator of the siphon, v b. Veins of the 

 arm, v c. Vena cava. o e. Gullet, g s t. Stellar ganglion. 

 a. Anus. z. So-called spleen, b r. Branchiae, a b r. Bran- 

 chial artery, c b r. Branchial heart, m b r. Branchial mus- 

 cle, v b r. Branchial vein. /. Urinal bladder, t p. Tubulus 

 peritonealis. c. Heart, s. Salivary glands. 



2. Circulation of Octopus vulgaris. Milne-Edwards, Ann. Sci. Nat., 



3 ser., Zool., iii, t. 14 35 



v b. Arm veins. J. Siphon, a. Anus, v c. Vena cava. 

 i. Intestine, a b r. Branchial artery, c b r. Branchial heart. 

 v b r. Branchial vein. z. Branchia. c. Heart, o v. Ovary. 

 s v. Sinus venosus. a o. Aorta, h. Liver, o c. Eye. 



3. Circulation of Octopus vulgaris. Milne-Edwards, 1. c., t. 16.... 35 



h. Liver, s v. Sinus venosus. oe. Alimentary canal, v. Stom- 

 ach, v g e n. Genital vein, c b r. Branchial heart, s v. Sinus 

 venosus. c v. Canal is venosus. o v. Ovary, c. Heart, i. In- 

 testine, v c. Vena cava. 



Plate 8. 



Nautilus Pompilius in its shell. Owen, Memoir on the Pearly Nau- 

 tilus, pi. 1 5, 38 



a. The mantle, b. Its dorsal fold, applied to the involute 

 convexity of the shell, c. Its free anterior marg,n. d. The 

 orifice for the passage of the funnel, e. The convexity pro- 

 duced by the ovarian gland. /. The horny girdle for the 

 adhesion of the mantle to the shell, g. The horny laminae cov- 

 ering the extremity of the left shell-muscle, h. A portion of 

 the shell, which was left adhering to this muscle, i. The 

 siphon, k. The funnel. I. Left lateral process of funnel. 

 m. Left cms or pillar of funnel, n. The hood. o. Exterior 

 digitations of the left side. o'. The larger one, with a papil- 

 lose surface like that of the hood. p. Digital tentacles, pro- 

 truded from their sheaths, q. The groove which separates the 

 hood from the papillose digitation. r. Ophthalmic tentacles. 

 s. The eye. t. Its peduncle, u. Inferior ridge or rudimentary 

 eyelid. v. The ridge running from this to w. The pupil. 

 x. Partitions of the chambers, y. The septal tubes which 

 gives passage to the membranous siphon, z. The chamber of 

 occupation. 



Plate 9. 



Circulation of Sepia officinalis. Hunter, Cat. Mus. R. Coll. Sur- 

 geons, ii, t. 2 1 35 



b r. Branchiae, a b r. Branchial artery. v b r. Branchial 

 vein, v v. Origin of the stomachic veins, c. Heart, c'. Auri- 

 cle, a o. Aorta. c b r. Branchial heart, v c. Vena cava. 

 r. Renal organs. 

 38 



