ro n \ 1 * 



of teeth and ;ui nna nurd rou of plate-, on either -ide ; 

 tlic^r of (he median row have thro ' tin- ne\t on 



either side I \vo faiiL;^. \\ hilsl tin- t \\ o outer i < >\ -, on |>< .t li .side- 

 arc Dimple, acute and .strongly curved. 

 Sepia ollicinalis. Tro-chel. il>id., t'. ', . 



Sepia Orbignyana, Taruioni, i. c., t. 7, r. 

 Plate 7. 



1. Ciivulation of Kledone inoscliata. Kefersteiii, t. 1 1 7. f. 2 :'"> 



,/. Siphon. .1. Klcvator of tin- siphon, n b. Veins of Hu- 

 m-in, 90. Vena cavil. <> c. (Juliet. // * f. Stellar ganglion. 

 Bo called spleen. f> r. Branchia'. a /> r. Bran- 

 chial artery, r h r. Branchial heart. //* h r. Branchial mus- 

 cle. / b r. liranchial vein. /. I'rinal bladder, t p. Tiilmlus 

 peritonealis. r. Heart, s. Salivary ,u lands. 



2. Circulation of Octopus vnl^-aris. ]\Iilne-Kd\vards, Ann. Sci. Xat., 



8r., /i.l., iii, t. 14 :'"> 



r />. Ann veins. /. Siphon, a. Anus, v c. Vena cava. 



'. Intestine, abr. Branchial artery, c b r. Branchial heart. 



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



x 9. Sinus venosus. n <>. Aorta, h. Liver, o c. Eye. 



3. Circulation of Octopus yulgaris. Milne-Edwards, 1. c., t. 16 :"> 



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

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

 venosus. c v. Canalis venosus. o v. Ovary, c. Heart, t. 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 

 oritice 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 lamiiue 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 

 dictations 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. </. The groove which separates the 

 hood from the papillose digitation. r. Ophthalmic tentacles. 

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

 eyelid. T. The ridge running from this to in. The pupil. 

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

 give- pa -sa-c to the membranous siphon, z. The chamber of 

 occupation. 



Plate 9. 



1. Circulation of Sepia otHcinalis. Hunter, Car. Mus. K. Coll. Sur- 

 geons, ii. t. -Jl 



b r. Branchiie. // / r. Branchial artery. r h r. Branchial 

 vein. 99, Origin of the stomachic veins. ,-. Heart. <'. Auri- 

 cle, a f). Aorta. < l> r. Branchial heart. v c. Vena 

 /. Renal organs. 

 38 



