42 



most nearly allied to the Pntamocottus Puchardsonii Gill or Cottus 

 Richardsonii Agassiz, but differs from it in the proportions of its 

 parts, and the character of the lateral line. 



Several specimens were obtained by Prof S. F. Baird, assistant 

 Secretary of the Smithsonian Institution, at Maysville, Kentucky, in 

 the year 1852. They are now in the Museum of the Institution, and 

 are numbered in the catalogue of fishes, 2,859. The largest is nearly 

 six inches long. 



I have given myself the pleasure of dedicating this fine species to 

 my estimable young friend. Miss Caroline Henry. 



Description of a new species of the genus Tigoma of 



GiRARD (abridged FROM THE FORTHCOMING RePORT OF CaPT. 



J. H. Simpson), by Theodore Gill. 



The full description and figures of this species will be published in 

 Captain J. H. Simpson's Report of his Explorations across the Conti- 

 nent in 1858 and 1859. The revised characters and synonymy of 

 the genus will be also given. 



Tigoma squamata Gill. 



The greatest height of the body equals three tenths of the total 

 length, and is about twice as great as the width. The head forms 

 more than a quarter (28-100) of the total length, and the distance 

 from the snout to the nape exceeds a fifth ; its Avidth behind equals 

 15-100 of the total length, and before, from cheek to cheek, one tenth, 

 or scarcely more than the interorbital area. The eyes are moderate, 

 the diameter exceeding a sixth (5-28) of the head's length ; the centre 

 of the pupil is distant two diameters from the snout. The dorsal fin com- 

 mences midway between the snout and the end of the central caudal 

 rays. The ventrals are inserted nearly under the first branched ray 

 of the dorsal. The number and character of the rays are indicated 

 by the folloAving formula : — 



D. 4, 71 ; A. 4, 61 ; C. 9, 1, 9, 8, 1, 8 ; P. 1, 14 ; V. 1, 9. 



There are about fifty scales along the lateral line. 



The color is a dark purple or purplish blue, with each scale mar- 

 gined with darker. The fins are of the same color as the body. 



Specimens of this species were obtained by Mr. C. S. McCarthy, 

 the collector of Captain Simpson's Expedition in the Salt Lake 

 Basin. They are entered in the Catalogue of Fishes in the Smith- 

 sonian Museum, under the number 2,607. 



Descriptions of new species of Pimelodin.e (abridged 



FROM THE forthcoming RePOUT OF CaPTAIN J. H. SiMPSON), 



by Theodore Gill. 



The three species that are now noticed will be fully described and 

 illustrated in the forthcoming Report of Captain J. H. Simpson, of 

 his Explorations across the Continent in 1858 and 1859. 



