PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 2838 
Sie ie | as oy a i a 
2 Seelih Se bulcsies > |ses | Ss 
3 as a3 a Ha b= ha 
4 o | E ArS.q 2 | os = 
© 22 | 25. | os¥e Ss | as = 
es eos |S Slo oe, “eS 2 
4 a A | wae |wooe S = 5 = 
Ser Peelb aeehh anne Iliguqlss = 
Ep <e2 | Sen | heer Be svibets 5 
g goo | peo Rass PMR gs & 
4 - pes | | R | ca 
. | 7 = | = = 
3 m a m Gi | m bs aur mn es mm. nM. 
1f CROCE OTIS Oia ae ato ral ee ee S 
TRS ALE os. =< 305 4.5 8.5 9 3.5 | 35 = Tj 
mfg RE See A 32 325 =f | 8 9 4.5 | 37 7 
. 5 See OE esi t.2 S pe t =F 9 10 B| 39 8 
1 { Sense ae maa aces aac | 27.9 _ OF TH! 9 4 40 6.5 
Q.- ee | 827.5 5 10 | —10 4 40 (Os 
Iv$¢ Laceec cae bee | 345 ed Sia 10 5 | 41 6 
Q | 344 4.5 | ee 10 4 43 7 
vs fof 359 AM oP Ft. O 9 5 41 —7 
22 352 S| 10 10 +5 42 7.5 
vis 3 359 == (0% || SES) — 9.5 5 + 41 = 7 
2 358 5 10 10 eal 42 +8 
EE ¢- 378 4.5 95 10 5 43 G 
2 375 Ge ist} 12 i | 45 +8 
vir § ¢ 389 4.5 | 9.5 | 10 5 | 44 7 
fe) | 380 — 55 10 11.5 4.5 47.5 aang 
— 4 indicates somewhat less than 4; + 4 somewhat more than 4. 
_ From this table the conclusion is reached that all the females have the 
dorsal fin higher than those specimens 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- 
o ments, the same feature might be 
(0) > assumed as characteristic of the 
re females. On the other hand, I attach 
great importance to the broader 
snout of the 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 fishermen, I found 5 eels with lobulated organs 
or 25 per cent. If, however, I paid attention to the two most impor- 
