[93] FLOUNDERS AND SOLES. 317 



The Museum of Comparative Zoology contains a single specimen 

 (11425, 3 inches long) of this species. It was obtained in the Uruguay 

 Eiver 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 XLIL— GYMNACHIBUS. 



Gymnachirus Kaup, Uebersicht der Soleime, Wieginanns Arcliiv, 1858, 101 {malm). 



Type : 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 OP 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 a s pectoral ; vertical 

 fins covered with thick skin; caudal as long as head; head 5^- (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 bauds, 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 fius 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 auda pale margin.] {Kaup) Nudus, 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 

 (coined). 



Habitat. — Coast of Brazil. 



The scanty description of Kaup gives all that is known of this species. 



Genus XLIIL— ACHIEOPSIS. 



Achiropsis Steiudachuer, Ichth. Beitriige, v, 110, 1876 (nattereri). 



Type: Solea nattereri 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 Achir us, they differ remarkably from the latter 



