[55] FLOUNDERS AND SOLES. 279 
In the Museum of Comparative Zoology are specimens of this species 
from Rio Janeiro, Santos, Victoria, Para, and Sambaia,in Brazil. The 
largest of these is 6 inches in length. Head 5 in length, depth, 1,%;; 
scales, 44; D. 85; A. 67. 
A re-examination of the specimens collected by Prof. O. P. Jenkins 
at Beaufort, N. C., and described by Dr. Jordan under the name of 
Htropus microstomus, shows that these are identical with the specimens 
ot Htropus from Charleston, Cedar Keys, New Orleans, and Galveston. 
These differ from the types of Htropus crossotus only in the slightly 
greater depth of the body, and in the slightly larger size of the scales. 
We now refer them to the latter species without much hesitation, hardly 
regarding them worthy of even subspecific distinction. 
Genus XXIIIL—THYSANOPSETTA. 
Thysanopsetta Giinther, Voyage Challenger, Shore Fishes, 1880, 22 (naresi). 
TYPE: Thysanopsetta naresi Giinther. 
We have not seen the typical species of Thysanopsetta. From the 
figure and description it would seem that the genus differs from Htropus 
only in having the teeth in villiform bands. 
ANALYSIS OF SPECIES OF THYSANOPSETTA. 
a. [Body oblong; head small; eyes 34 in head, well separated, the interorbital space 
being flat and scaly ; mouth moderate, the maxillary more than one-third head; 
teeth in villiform bands; scales adherent, ctenoid; a fleshy lobe behind ventrals ; 
lateral line straight; head, 5; depth, 24; D. 87; A. 59; lat.1. 76 (in plate); color, 
nearly uniform brownish, the body and fins mottled. ] (Giinther) -.-.-...NARESI, 63. 
63. THYSANOPSETTA NARESI. 
Thysanopsetta naresi Giinther, Voyage Challenger, Shore Fishes, 1880, 22. (Cape Vir- 
gin, Straits of Magellan.) 
Habitat.—Straits of Magellan. 
We know this species from the original figure and description only. 
Genus XXIV.—MONOLENE. 
Monolene Goode, Proc. U.S. Nat. Mus., 1880, 337 (sessilicauda). 
TYPE: JMonolene sessilicauda Goode. 
This peculiar genus of deep-sea flounders is probably allied to Ario- 
glossus and Citharichthys. Of this we cannot speak with certainty, not 
having examined any members of the group, and the insertion of the 
ventral fins has not been described in either of the two known species. 
ANALYSIS OF SPECIES OF MONOLENE. 
a. [Dorsal rays, 99 to 103; anal rays, 79 fo 84; scales of blind side ctenoid, 23-92-25; 
head everywhere closely scaly, even to the lips and front of snout ; mouth oblique, 
the maxillary less than one-third length of head; teeth, uniserial, subequal; eyes 
' very close together, the interorbital space a very narrow ridge; arch of lateral line 
very peculiar, the curve having two angles; head 5 in length; depth, 23; ashy 
brown, with spots of darker brown; pectoral barred; vertebra 43.] (Goode) 
SESSILICAUDA, 64, 
