VII ^ 



villi 



mm. 

 270 

 305 

 325 

 324 

 327. 

 327. 

 345 

 344 

 355 

 352 

 359 

 358 

 378 

 375 

 389 

 380 



62 



c^ ? =" 



mm. 



8 



9 



9 



10 



9 



—10 



10 



+ 10 



9 



10 



— 9.5 



10 



10 



12 



10 



11.5 



7nm. 

 4 



3.5 

 4.5 

 5 

 4 





7n9ft. 

 35 

 35 

 37 

 39 

 40 

 40 

 41 

 43 

 41 

 42 



+ 41 

 42 

 43 

 45 

 44 

 47. 



mm. 

 6 



— 7 

 7 

 8 



6.5 

 7.5 

 6 



7 



— 7 

 7.5 



— 7 

 + 8 



7 

 + 8 



7 

 + 8 



— 4 indicates somewhat less than 4 ; -t- 4 somewhat more than 4. 



From tbis table thcconclusiou is readied tliatall the females have tbe 

 dorsal liu higher than those sj)ecimeiis of the same length presumed to 



be males, and that with age this dif- 

 ference becomes still more marked. 



The larged-eyed character of eels 

 with the lobulated organs has ap- 

 peared to me to be too uncertain a 

 feature, so much so that, according 

 to the foregoing table of measure- 

 ments, the same feature might be 

 assumed as characteristic of the 

 females. On the other hand, I attach 

 great importance to the broader 

 snout oftthe female in contrast to 

 the slender and pointed snout of the male. But the snout of the female 

 is not only broader, but also more depressed, and has the eyes more 

 prominent, a feature to which I would call special attention, and one 

 which I do not find in the male. In contrast, the snout of the male eel 

 is more convex, as will be seen by comparing the accompanying outline 

 sketches. 



If one will only notice the width or slenderness of the dorsal, and 

 more especially the broad, depressed snout of the female, with the promi- 

 nent eyes, as compared with the slender, convex snout of the male, it 

 will require little trouble to pick out the specimens from these data con- 

 jectured to be males. 



On an average amongst twenty eels, measuring 300-500"'™ in length, 

 furnished me by different fisherman, I found 5 eels with lobulated organs 

 or 25 per cent. If, however, I paid attention to the two most impor- 



