PLATE VII. 

 Anableps anableps Linne. 



(Lettering: a. hi, air bladder; i, intestine; k, kidney ; w, muscle moving anal fin and compress- 

 ing the seminal receptacle ; o, ovary ; p, compressor band on bladder ; «. hi, seminal recep- 

 taculum ; t, testis ; u, ureter ; u. hi, urinary bladder ; x, muscular valve at junction of ureter 

 a7id seminal duct ; z, fold of intestine.) 



Fig. 1. Sinistral female, showing the foricnlar scale opening to the left side. 



Fig. 2. Dextral male ; with anal turned to the right near its extremity, with a glandular 

 tubercle on the left side, and with tactile extremities to the rays. 



Fig. 3. Sinistral male ; anal bent to the left, gland on right side. 



Fig. 4. Dextral female ; foricula opening to right side ; heavy dotted line indicating great 

 extent of ovary filled with embryos ; light dotted line showing intestine, much 

 crowded forward ; broken line tracing the liver, much reduced in size. 



Fig. 5. Sinistral female: ovary presenting a forked appearance behind , the intestinal fold; 

 intestine and liver occupying much more of the abdominal chamber than in Fig. 4. 



Fig. 6. Sinistral male from right side, showing position of bladder, band (p) for closing the 

 urinary chamber, muscular valve (x) at junction of urinary and spermatic ducts, 

 testis (t) and connection with seminal bladder (s. bl) in dotted lines, ducts from the 

 kidneys (Ic), and end of intestine (('). 



Fig. 7. A young male, of three and three fourths inches, before assumption of dextral or sin- 

 istral condition, showing the growth of the tube downward from the valve (x) 

 along the first ray of the anal. 



Fig. 8. Male of four and one half inches, showing transformation of anal farther advanced 

 than in Fig. 7. 



Fig. 9. Anal fin of male, of five inches, showing tube in full length of anal. Anal not yet 

 bent to one side, but with gland appearing on left side, which determines the speci- 

 men as ultimately dextral. 



Fig. 10. Anal fin of sinistral male of five and one fourth inches, with the gland on the right 

 side of the fin, while the tube has taken up a position on the left side of the an- 

 terior ray. 



Fig. 11. Testis (t), end of intestine (/), air bladder (a. bl), ends of kidneys {k), and outer aspect 

 of bladder with muscular valve {x) and connected tubes. 



Pig. 12. Interior of No. 11, showing internal partitions of bladder, separating into spermatic 

 and urinary chambers, muscular valve (x) controlling outflow from both, and tubes 

 of kidney and testis. Dotted line marking extension of spermatic chamber (s. bl) 

 upward behind urinary bladder. 



Fig. 13. Bladder of male split open on lower aspect, showing ends of ducts from testis, par- 

 titions in the interior, and by dotted lines tracing the ureter to the valve (x). 



Fig. 14. From a sinistral female, left side, with foricula raised to expose openings of ureter 

 and ovary, showing bladder, end of kidney, end of ovary and end of intestine at 

 vent. 



Fig. 15. Sinistral male from below, shows testes and ducts, end of intestine, compressor band (/>), 

 muscles for moving the anal («), muscular valve (x) at end of spermatic duct, 

 bladder, and anal fin. 



Fiar. 16. Intestinal fold, dotted lines tracing the interior. 



