THE GYMNOTID EELS OF TROPICAL AMERICA. 179 
appendage. The following table gives the data for these. All three of the localities 
from which they came are in British Guiana. 
Gymnotus carapo. 
No. Locality. 
| Number of Specimens. Length of Body. Number Injured. 
eee a = #8: a } 
i, HEGRE, opr otaree eres | 34 _ 80-435 mm. 2 
2 INICKADANOOR racceisive ersreicre © crete siete | 32 80-340 mm, 1 
3 Weikeitier techs. crctorctreresusatires esc | 30 51-310 mm. 1 
MOLAR A Aroitcnara ers retesaehareedee asta 96 
The other three cases proved more interesting. 
One specimen, body length estimated 125 mm., from the Rio Coite, Eastern 
Brazil, had lost the entire caudal appendage and about twenty millimeters of the 
caudal portion of the body. It had been lost by an irregular injury which ran at 
right angles to the back. The regeneration had been most rapid in the region of 
the backbone. The new tissue at this point being six millimeters long and bearing 
a new caudal appendage nearly two millimeters in length. There had been scarcely 
any repair to the extreme ventral edge of the injury in the region of the anal fin. 
The entire piece of regeneration tissue was thus roughly triangular. It bore 
along its ventral margin several very tiny fin-rays, not over half a millimeter long, 
and its maximum thickness was nearly two millimeters, only about one-half that 
of the uninjured body, just in front of it. The dorsal portion of the new tail was 
scaled over most of its basal half. The regenerated portion was uniformly pale 
yellow in color and without markings. Fig. 19 is an outline drawing of this tail. 
Fie. 19. Regenerated Tail. Gymnotus carapo (Linnus), Rio Coite. 
Another individual three hundred millimeters long, from the Amazon at Santarem, 
Brazil, had received nearly the same kind of injury, differing, however, in that 
the regeneration was much farther advanced. (See Fig. 20.) Nearly eighty 
millimeters of the body, and the entire caudal appendage, had been lost by a rather 
straight injury across the body. Of this sixty-five millimeters had been regenerated. 
The new tail bears a caudal appendage eight millimeters long and a small well 
developed fin. The latter is completely, although irregularly, joined to the unin- 
