M i; i \' i TI > PLAT1 



'JO. Kmbiyo 111 eighth slam-, from tin- lurk. 



ji. Section of an advanced embi\o. i represents the oepbalic awl 



''> tin- ;ili|,)iiiin.il portion of the iniirr yolk >ark. 



Plate 22. 

 Development of Cephalopoda 46 



Month. />. Outer yolk-sack. T. Tentacles. ./. Siphon. 

 " -. Kye>. //. Iiiitton-likc cart ila^e. l> r. I'ranchia-. *'. 

 ceral sack. /< /. Ink-bat;. 01. ( >t'>lithcs. x. Salivary ^land*. 

 r. Stomach, r'. Blindsack. c, Heart, chr. Uranchial hcai t>. 

 I (n .">. Arms. 1. 'J, :!. Tort ions ot' the inner yolk-sack, head, 

 neck and stomach. 



I. Kmln \o of Sepia ollicinalis, three or four times smallei- t hail its 



yolk-sack. Kolliker, Eiitwickhingsgeschichte der Cephalo- 

 poden, t. 4, f. 88. 



HOC view of the same. L. c., t. :5, f. 2S. 

 I >oisal \ ie\v of a more developed embryo. 

 4. A yoiinu Sepia ofHcinalis, ventral view, the mantle cut open. 



Cnvier, Nouv. Ann. dn Mus., i. 



."> 10. Yolk-sack in progressive stages of development. Kolliker, I.e. 

 11. Portion of t't^-cluster of Loli^o vnluaris. Fer. et Orb. ('('ph. 

 TJ. Kmbryo of the same. Fer. et Orb. Ceph. 

 \'->. A. group of eggs of Argonanta aiyo, Fer. et Orb., I.e., t. 1 ter., f.tt. 

 14. I-'.^u of A.rgonauta aigo. Kolliker, I.e. 

 !.">, l>. Ibid. A iipeai-ancc of the mantle, head, arms, eyes. Kolliker. 



17. More advanced embryo of the same. Kolliker. 



18, 19. Matured embryos, dorsal and ventral views. Kolliker. 



Plate 23. 



\, 1. ( )ctopns aranea. Fer. et Orb. Cephalopodes, t. 5, f. 1, 2 Ill 



:'.. I O. o.-topodia. Linn. O. vuljjaris, Lam. D'Orb. in Sagra's 



Cuba, t. 1, f. ], 113 



Plate 24. 



"). (>. octopodia, Linn. ( ). vulgaris. Lam. Fer. et d'Orb., t. 11... 113 



sucker. D'Orbigny, Moll. Viv. et Foss.. t. 1 11:', 



O. vulgaris, Lam. Jeffreys' Brit. Conch., vol. v. . . 113 



Plate 25. 



0, Salutii. Verany. Cephal. Medit., t. 1) ill 



II. <>. I-UU-OMIS. I'.osc. O. graimlatus. Lam. Ft-r. and d'Orb., 



t. 'L f. 1 116 



10. (>. brevipes, d'Oi-b. Cephal., t. 17, f. 1 11 '. 



11. O. hoiridus, t. 7, f. 3 11! 



Plate 26. 



K\ <). a.-uleatus, d'Orb. Crphal., t. 7. f. 1 KM) 



i: 1 ., 14. 0. aculeatus, beaks, d'Orb. Cephal., t. 28, f. 8, 4 K>0 



1"), Hi. O. lumdatiis, (Jnoy and ( Jaimard. Voy. Astrol.. t. , i. 1. -J. 1'Jl 



Plate 27. 



17. < >. tetra.-irrus. Chiaje. Yei any, ( Yph. Medit ., t . 1111 



1 s . O. snperciliosii- Huoy and Gai'm. Yoy. Astrol., t. 6, f . 4 KM 



