130 MR. OWEN'S DESCRIPTIONS, ETC. 



Fig. 8 & 10. A sucker of one of the peduncles, magnified. 



11. Head oi Loligo laticeps ; a, outer lip, b, inner lip ; magnified. 



12. Octopus semipalmatus, dorsal view ; natural size. 



13. Octopus semipalmatus, ventral view, with the mantle laid open, magnified ; 



a, the crescentic ridge on the side of the hase of the funnel, articulating 

 with b, the corresponding cavity in the mantle : the other parts correspond 

 with those in the common Poulp {Octopus vulgaris). 



14. Argonauta Mans, Sol., withdrawn from the shell; (three times the natural 



size of the specimen figured) . The mantle is laid open to show the vertical 

 septum, and a and b, the dislocated joint of the funnel of the right side. 



15. An ovum of the same specimen, magnified. 



16. The anal valves of a Decapodous Cephalopod {an Sepioteuthidis species?) from 



Port Jackson. The upper figure shows them closed ; the lower figure, open. 

 Natural size'. 



17. The organ of hearing of the Cuttle-fish {Sepia officinalis) : both vestibular 



cavities are laid open, showing the obtuse elastic processes which are in 

 contact with the capsule of the otolithe or calcareous body ; the capsule is 

 laid open on one side. Natural size. 



18. Female organs of generation of Rossia palpebrosa, Owen. Natural size. 



a. Ovum in its reticulate ovisac or calyx. 



b. Ovisac, in the act of discharging its ovum. 



c. Discharged ovisacs. 



d. Oviduct. 



e. Terminal gland of the oviduct. 

 /./. Ova passing through the oviduct. 



g.g. Accessory ovarian or nidamental glands. 

 h. h. Corpora succenturiata. 



19. Corpus succenturiatum oi the Cuttle-fish {Sepia officinalis) . 



20. The same ; one lobe bisected, to show its structure. 



' As this sheet was going through the press, I received from Mr. George Bennett three entire specimens of 

 the Cephalopod from Port Jackson, of which the viscera are described in the preceding pages, proving it to be a 

 species of SepioteutMs. 



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