506 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



there are 7 rays in the anal fin. lu H. maculata there are about 16 scales 

 in front of the dorsal, and the anal rays are I, 8. 



This species will come under Professor Jordan's genus Chriope. (Bull. 

 U. S. Geol. Surv. vol. iv, No. 4, 787.) 



Genus LUXILUS, Ilafinesque, 



34. Luxilus cornutus (Mitch.) Eaf. 



JJypsilcjns conuitus, Cope, Trans. Amer. Phil. Soc. 18(i9, .372. 



Three specimens of the young of this widely diffused species were 

 obtained at Corinth, and many others at Enterprise. 



35. Luxilus chickasavensis, Hay, sp. nov. (No. 27,419.) 



This species closely resembles Codoma stigmatura, Jordan, from the 

 Alabama Eiver, originally described as Photogenis stigmaturus. (Annals 

 N. Y. Lye. Nat. Hist. 1877, 337.) If Codoma is to be regarded a valid 

 genus, and if Ph. stigmaturiis belongs to that genus, then the present 

 species will be Codoma chickasavensis. I do not, however, believe that 

 there is sufficient grounds for putting Photogenis stigmaturiis and Lux- 

 ilus analostanus into different genera. So far as I can determine with 

 the aid of a good microscope, the masticatory surface as truly exists on 

 tbe teeth of Ph. stegmaturus as on those of Lux. analostanus. Some- 

 times in the former species one edge is serrated ; aud in some species of 

 Codoma, as this genus is limited by Professor Jordan, occasionally both 

 boundaries of the concave surface are serrated. I hope, at no distant 

 period, to be able to discuss this subject still further. For the present 

 I adopt the name Luxilus for both this species and Luxilus analostw- 

 nus (Grd.) Jor. 



In a close comparison of the present species with Codoma stigma- 

 tura, I find the following differences to exist : There are fewer scales 

 along the lateral line, 38 to 40 instead of 45. The eye is also consid- 

 erably larger, being contained in the head 3^ times instead of 4^, and 

 about equal to the snout. The caudal spot is as intensely black as in 

 C. stigmatura, but considerably smaller. It is about as large as the eye, 

 sometimes smaller ; whereas in that species it is nearly always larger, 

 being in length " usually about one-third of the head". In this species 

 it is about one-fourth of the head. Neither does it extend so far on the 

 rays of the caudal fin. The form of the head and body, and the position 

 and size of the fins, are apparently the same as in C. stigmatura, un- 

 less it be that the body is a little deeper, the depth being contained in 

 the length from 4 to 4^ times. 



The black spot on the posterior rays of the dorsal fin is obsolete or 

 wanting, while there is a narrow dark line running up on one or two of 

 the anterior dorsal rays. 



There are, on the heads of a few of my specimens, some evidences of 

 the existence of tubercles. 



