598 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
5. GYMNOTHORAX AQUiE-DULCIS. 
Murcena aquce-dulcis Cope, U. S. Geol. Survey Montana, etc., 471, 1872. (Rio Grande, 
Costa Rica.) 
JRabula aquev-dulcis, Jordan & Davis. 
Habitat : Pacific coast of Tropical America. 
Etymology: Aqua dulcis , fresh water. , 
We refer to this species a specimen (6073, U. S. N. M.) said to have 
been collected at San Diego, California, by Dr. J. G. Cooper. It prob- 
ably can e from farther south. This specimen differs somewhat from 
Cope’s description, but, like Cope’s fish, it differs remarkably from all 
other known species of the genus in the insertion of the dorsal. We 
have not much doubt of the correctness of our identification. 
The species resembles the young of G. mordax , and it may have been 
overlooked by San Diego collectors on account of this resemblance. It 
probably does not occur in fresh waters. 
6. GYMNOTHORAX MARMOREUS. 
Murcenophis marmorcns Valenciennes, Voy. Venus, Zool., 347, 1855, pi. 10, fig. 1 
(Galapagos Islands). 
Habitat: Galapagos Islands. 
Etymology: Latin, marbled. 
This species is known only from the accounts given of the original 
type, a stuffed example, 21 inches long, obtained by Freminville at the 
Galapagos. It may be identical with G. aquce-dulcis , or even with 
Murcena lentiginosa , but this is less likely. 
7. GYMNOTHORAX PANAMENSIS. 
Murcena panamensis Steindachner, Ichth. Beit., v, 19, 1876 (Panama). 
Sidera panamensis Jordan & Gilbert, Proc. U. S. Nat. Mus., 623, 1882 (Pearl Islands). 
Habitat: Pacific coast of Central America. 
Etymology: From Panama. 
This species is. known to us from a specimen taken at the Pearl 
Islands, near Panama, by Prof. Frank H. Bradley, and from another 
(6015, U. S. IN. M.) said to be from 11 South America.” From this speci- 
men our description is taken. It differs from Steindachner’s account 
in having the vomerine teeth blunt and the lower teeth in one row. 
This species is one of the most strongly marked in the genus, being* 
well distinguished by the form of its teeth, its curved lower jaw, and 
posterior dorsal. 
