XV 



Fig. 18 left side. 



Fig. 19 



right side. 









A\ A*, 



A%, etc. arms one. 



two three, etc. 



J.i 



lower „ 



A. 



hectoootylus. 





M.G. 



mantle chamber. 



AC. 



accessory gland. 





KG. 



nuchal cartilage. 



B.L. 



buccal lobe. 





N.GL. 



nephridial coelom. 



C.G. 



cephalic cartilage, 



or skull. 



OB. 



odontophore. 



CA. 



caecum. 





OE. 



oesophagus. 



CL. 



coelom. 





PA. 



pancreas. 



F.C. 



fin cartilage. 





P.L. 



palatine lobe. 



GO. 



gonad. 





P.M. 



peristomial membrane. 



H. 



heart. 





PN. 



pen. 



I.S. 



intestine. 





S.GL. 



siphonal gland. 



L. 



liver. 





SP.S. 



spermatophoric sac. 



L> 



hepatic duct. 





V.DE. 



vas deferens. 



J. 



upper jaw. 









Fig. 20. 



Section through the ciliary body and lens of an embryo of 2 mm. 



1. outer layer of ectoderm (outer part of ciliary body). 



2. inner „ „ „ (inner „ „ „ „ ). 



3. lens. 



4. processes from the ciliary body to the lens. 



Fig. 21. Section through the ciliary body of a squid of 20 mm. 



1. supporting ligament of lens and ciliary body. 



2. fold in the outer part of the ciliary body. 



3. epithelium of the outer chamber of the eye. 



4. lamella of lens. 



5. processes of cells of ciliary body. 



Fig. 22. Horizontal section thru the eye. 



A. muscular base of the arms. 



A.C. outer chamber of eye. 



B.S. outer and inner buccal sinuses. 



G. cornea. 



Ca. accessory , or supporting cartilage of the eye. 



Ci.B. ciliary body. 



Ci.M. ciliary muscle (musculus retractor lentis). 



E. oesophagus. 



F. fascia separating the liver from the oeso- 



phageal sinus. 

 I. iris. 

 L. lens. 



6. epithelium of inner chamber. 



7. fascia supporting a fold of the ciliary body. 



8. fibres in fold of the ciliary body. 



9. epithelium of ciliary body. 



Lig. 



lateral ligament of skull. 



M. 



orbital fascia. 



O.G. 



optic ganglion. 



O.S. 



orbital sinus. 



P. 



"aquiferous pore". 



P.G. 



inner chamber of eye. 



R. 



retina. 



Scl. 



sclera. 



Sk. 



skull. 



T.S. 



tentaculor sac. 



W.B. 



lower white body. 



W.B, 



L uppei' „ 



