PLATE VI. 
Anableps anableps Linné. 
(Lettering: a, auricle ; an, anus ; b, belly; 6, bladder ; ec, conus arteriosus; g, gills; 2, intes- 
tine; J, liver; s, sinus; ss, sinus sacci; sé, stomach; v, ventricle.) 
Fig. 1. Embryo, after escape from egg envelope, one and five 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. 3. 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 inch 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 papilla 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 vertebre 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. 10,11. Heart of adult of seven and one half inches, lower surface and left side. Natural 
size three fourths of an inch. 
Figs. 12,13. 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. 14. Section of left side showing position of heart, liver, gills, precaval sinus, and the 
sinus sacci (ss.) 
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