REPORT ON ICnXIIYOLOGY. 393 



The ventrals arc loiijicr than tlu! pectorals, and equal seventeen hundredths of the 

 length. The spine is more than half as long as the first hranched or lon<iest ray. 



The number and arranoement of the rays of the respec'ti\e fins are indicated bj- 

 the following formula : 



D. IX + I. 1. 11; A. III. 1. 1); C. '). I. S. 7. 1. 4; P. 2. 11: V. 1. f,. 



The scales of the trunk are of moderate size, with the nucleus at about the pos- 

 terior third; thence about ten ridges radiate toward the posterior margin, which is 

 crenated by them. Numerous murieated ridges, terminating in pectinations at the pos- 

 terior margin, also radiate ])Osteriorl3^ from the same nucleus. The concentric striic 

 are fine but well marked. The number of scales through wliicli tlie lateral line passes 

 amounts t(i from fifty-three to fifty-six, exclusive of the smaller ones at the base of the 

 caudal fin. The number of rows is nine above the lateral line, one through which the 

 lateral line runs, and fourteen below. 



The operculum is covered Avith moderate scales, which have subcentral nuclei 

 and murieated and pectinated posterior margins. Those on the cheeks are nuu-h 

 smaller, with tlie nuclei also subcentral, but with genorall}' entire, or nearly entire, 

 margins. Some of the larger scales near the ])osterior margin of the preo])erculum 

 are pectinated like the opercular ones. 



There are on the lower jaw five pairs of indistinct, shallow, muciferous grooves; 

 those of the third and fourth pairs are elongated, the last l)eing under the terminal part 

 of the maxillaries. The fifth pair is obsolete. The maxillaries, on their superior parts, 

 are covered with scales smaller than those of the cheeks; the inferior and posterior 

 portions are naked. 



The color is silvery, tinged with golden on the sides below the lateral line, and 

 above with rose. A number of blackish or dusky lines traverse the sides, four of 

 which are above the lateral line; througli a fifth the lateral line runs; and there is a 

 variable niunber of more or less distinct oiu\s l)elow. The head is dark above and 

 silvery on the sides. 



The spinous dorsal is ])unctulated with black, and has a narrow black margin. 

 The soft dorsal is also punctulated. The anal is blackish at its nn'ddle and margin 

 between the ravs. The caudal is similar to the dorsal. The pectorals and ventrals 

 are immaculate. 



The Itocciis rhrysojis thus described is undoubtedl}- identical with the I'crca or 

 Lepibema chrysops of Rafinesque, and the Lahrar multU'incatus of the "Ilistoire Natu- 

 relle des Poissons" and of Kirtland. The descriptions that have been given of the 

 species wider those names are meager and unsatisfactory ; but the notice of the color 

 given by the above-named authors, and the possession of sjiecimens from the same 

 hydrographical basins as tho.se from which the fishes described l)y them were taken, 

 leave no doubt as to the identity of the species. 



Rafinesque's descrii)tion of his Pora chnjsops is, like almost all his descriptions, 



inapplicable to any kn<iwn fi.sh, but it agrees with the Moronc chri/sops l)etter than any 



other species. Rafines(pie erroneously attributes to his species six In-anchiostegal 



rays, a single opercular sjjine, eight spines to the first dorsal fin, and places it under 



50 b u 



