PLATE III. 



Ophiodoti elongatus ; Blue cod. 



Hydrolagiis colliei; Chimsera (Fig. 26). 



Fig. 17. Represents the blood supply to and from the nasal sac, as seen from 

 the right side. Anterior part of the eye shown in outline. 40 lb. 

 Op/iiodoii, X 2. 



18. Same as 17. Nasal sac in outline, to show the veins leaving the inner 

 side of the sac. 



19. Dissection of the right eye from the inside. The sclerotic coat and 

 silver layer of the choroid are removed to show the large choroid sinus, 

 the double rete mirabile or choroid gland, [and the iris vein, all of 

 which run in the vascular layer of the choroid coat. 20 lb. Offtiodoii, 

 natural size. 



20. Same eye, but deeper dissection to show the choroid artery and its rete 

 mirabile. 



21. Frontal section through the retina and choroid coats, showing the 

 choroid artery, the choroid sinus, and the retina artery in section. 

 20 lb. Op/iiodo7i, natural size. 



22. Shows an inside view of the right eye. A sagittal incision was made 

 nearly through an injected eye and the three coats were folded to the 

 right. The entire course of the retina arterj' from its entrance with 

 the optic nerve until it ends on the lens is distinctly shown. 15 lb. 

 Ophiodon, X Vz ■ 



23. General lateral view of the blood supply to and from the brain. 15 lb. 

 Ophiodoii, natural size. 



23^. Blood vessels to and from the auditory organs. 30 lb. Ophiodon ^ 

 natural size. 



24. General dorsal view of the vascular supply of the same brain as Fig. 

 23. Cranial nerves and anterior encephalic veins shown only on the 

 right side. 



25. Same brain as above from the ventral side. Cranial nerves not shown 

 on the right side. 



, 26. General lateral view of the main branchial vessels of Hydrolagus 

 colliei, Chimsera. Inserted to show the wide variation in the carotid 

 arteries, y^yi- 



