REFERENCE TO PLATES. 299 



FIGURES. PAGE. 



3. Venous system of Octopus vulgads. Chiaje, 1. c., t. 87 35 



s v. Sinus venosus. v c. Vena oava. r. Kenal organs. 

 c 0, Venous hearts. b r. Branchiae. 



4. Arterial system of Octopus vulgaris. Chiaje, 1. c., t. 88 35 



c. Heart, c'. Auricles, a o. Great aorta, b r. Branchiae. 



Plate 12.* 



1. Nervous system of Om mast replies todarus. Ventral face. Han- 



cock, Ann. Mag. N. Hist , 2 ser., x, t. 1, 2, 1852 32 



g v. Visceral ganglion, op. Optic nerve, gp. Pedal gan- 

 glion. gbs,gbi. Superior and inferior buccal ganglia, b. Arm 

 nerves. n v. Visceral nerves g s t. Ganglion stellatum. 

 npi. Fin nerves, nee. (Esophageal nerves, gve. Splanchnic 

 ganglion, g x. Ganglion on the vena cava. g b r. Branchial 

 ganglion, b r. Branchial nerves, n y. Nerves of the ink-bag 

 and rectum. 



2. (Esophageal ring of the same, from the back. Hancock, 1. c. . . 32 



g c. Cerebral ganglion, o p. Optic nerves, g p. Pedal gan- 

 glion, b. Arm-nerves, g b s. Superior buccal ganglion. 



3. The same, from the side 32 



o e. Gullet. t n. Siphon nerves. o t. Acoustic nerves. 

 g v. Visceral ganglion, g p. Pedal ganglion, b. Arm nerves. 

 o p. Ocular nerve, g c. Cerebral ganglion. 



4. (Esophageal ring of Sepia officinalis, from the side. Garner, 



Trans. Linn Soc , xvii, t. 27. 



m b. Buccal mass, g b i, g b s. Inferior and superior buccal 

 ganglia, gp. Pedal ganglion, gv. visceral ganglion, o e. Gullet. 

 o p. Optic nerve, g c. Cerebral ganglion. 



5. The same from the back. Milne-Edwards in Cuviers Regn. 



Anim. Moll., t. 1, f. , fig. 2 32 



Keferences same as fig. 4. 



6. Auditory organ of Sepia officinalis. Owen, Trans. Zool. Soc. 



Lond., ii, t. 21, 1841 35 



The cephalic cartilage, k, withdrawn to show the otolithic 

 cavities. 



7. Section of eye of an embryo Loligo. Kolliker, Eutwick. der Ceph., 



t. 5, f. 59 33 



I. Lens. /. Retina, s. Sclerotica. c i. Ciliary bodies. 

 /. Iris. a. Outer skin. 



8. Chromatophore from the skin of Sepia officinalis. Keferstein, 1. 



c., t. 120, f . 8 6 



Contracted chromatophore of the same. Keferstein, 1. c., f. 9. . . 6 



Plate. 13. 



Circulating and respiratory organs of Nautilus Pompilius. Owen, 



1. c., t. 6 35 



1 . The great vein. 1 ' . The orifices by which it communicates 

 with the abdominal cavity. 2. The venous sinus. 3. Splanch- 

 nic veins from the liver, ovary, gizzard, etc. 4, Origins of the 

 branchial arteries. 5. Branchial arteries. 6. The follicles ap- 

 pended to the branchial arteries. 7. Orifices by which they 

 communicate with the branchial arteries, exposed on the left 

 side (the parts being seen from the dorsal aspect). 8. The 

 valve at the entry of the branchial artery into the gill, exposed 

 in the right anterior vessel. 9. Cavity of the same artery, 



