[93] FLOUNDERS AND SOLES. one 
The Museum of Comparative Zoology contains a single specimen 
(11425, 3 inches long) of this species. It was obtained in the Uruguay 
River by Prof. Jeffries Wyman. It is near A. fasciatus, from which 
species it differs mainly in having fewer fringes on the scales of the left 
side of head, and in having rather conspicuous cirri on the snout*and 
chin. 
Genus XLIT.—-GYMNACHIRUS. 
Gymnachirus Kaup, Uebersicht der Soleine, Wiegmann’s Archiv, 1858, 101 (nudus). 
TyeE: Gymnachirus nudus Kaup. 
We have examined none of the species of this singular genus. All 
that we know of it is drawn from the descriptions of Kaup and Giin- 
ther. Two species have been described. 
ANALYSIS OF SPECIES OF GYMNACHIRUS. 
a. [Pectoral fin of right side present, very small, of two rays only, one-third as long 
as eye; jaws hidden in thick skin; lips slightly fringed ; left side of head with a 
network of fringes; gill opening not reaching upward as far as pectoral; vertica] 
fins covered with thick skin; caudal as long as head; head 54 (with caudal); 
depth 2; D. 68, A. 50; color yellowish olive, with 14 brown bands, as broad as 
the interspaces, which again are crossed by narrower bands, all these bands ex- 
tending over the dorsal and anal, the first crossing the snout, the second and third 
the eye; caudal with three brown bands.] (Giinther).--.....--.. FASCIATUS, 119. 
aa. [Pectoral fins both wanting. Body somewhat longer than high. D.51; A. 42. 
Body with 14 black cross-bands; concentric rings about eyes; caudal with two 
black bands and a pale margin.] (Kaup)..---.---...--.0.e02 obec Nupws, 120. 
119. GYMNACHIRUS FASCIATUS. 
Gymnachirus fasciatus Giinther, Cat. Fish. Brit. Mus., iv, 488, 1862 (locality unknown). 
Habitat.—Unknown, probably Brazil. 
We know this species from Dr. Giinther’s description only. Possibly 
Gymnachirus nudus may be the same species carelessly described by Dr. 
Kaup. ; 
120. GYMNACHIRUS NUDUS. 
Gymnachirus nudus Kaup, Wiegmann’s Archiv, 1858, 101 (Bahia). Giinther, iv, 488 
(copied). 
Habitat.—Coast of Brazil. 
The scanty description of Kaup gives all that is known of this species. 
Genus XLIII.—ACHIROPSIS. 
Achiropsis Steindachner, Ichth. Beitrige, v, 110, 1876 (nattereri). 
Type: Solea natterert Steindachner. 
This is another of the remarkable genera found in the fresh waters 
of South America. Although its species bear a strong general resem- 
blance to the species of Achirus, they differ remarkably from the latter 
