I'LATE VI. 



Anableps anableps Linn^. 



(Letteriug : a, auricle ; an, anus ; 6, bully ; bl, bladder ; c, conus arteriosus ; ff, gills ; i. intes- 

 tine ; /, liver ; s, sinus ; ss, sinus sacci ; $t, stomach ; v, ventricle.) 



Fig. 1. P>mbryo, after escape from egg envelope, one and live eighths inches in length, expos- 

 ing contents of abdominal sac. 



Fig. 2. Embryo of one and one fourth inches, showing position inside the membranes, with 

 masses of albumen (w.) 



Fig. ■\. Embryo of one inch, membranes, albumen and outer wall of belly removed, showing 

 intestine, and the blood vessel (ss) entering the auricle from the sac. 



Fig. 4. Embryo three fourths of an imli in length inside the membranes, showing compara- 

 tive size of belly and position of masses of albumen. 



Fig. 5. Saccular sinus and blood vessels leading to it as indicated by the papilla3 on the lower 

 surface of the belly. 



Fig. 6. Diagram of hinder portion of right side of belly showing modes of branching and 

 uniting of the blood vessels. 



Fig. 7. Diagram of the vessel descending from the sinus below the vertebra; and above the 

 anus to a point below and at the left of the last, whence it sends a branch across 

 and forward on the right side of the sac, also another forward on the left. 



Fig. 8. Outline of vessel and branches passing back and downward on the right side of the 

 sac just back of the heart. 



Fig. 9. Right side showing the sinus, at the gill chamber, connected with the liver, extending 

 downward to the branches on the belly, indicated by the rows of papilla;. Dotted 

 lines indicating the main vessel of the belly, the auricle and ventricle. 



Figs. 10, II. Heart of adult of seven and one half inches, lower surface and left side. Natural 

 size three fourths of an inch. 



Figs. 12, l."i. Heart of an embryo measuring about one inch in total length. Lower view and 

 left side, showing the vessels {ss and s) that ultimately give way to the auri- 

 cular sinus. 



Fig. 11. Section of left side showing position of heart, liver, gills, precaval sinus, and the 

 sinus sacci (ss.) 



