58 BULLETIN" OF THE UNITED STATES FISH COMMISSION. 



ponds along the river, which had been filled during the period of high 

 water. From Memphis I proceeded to Vicksburg, Miss., where I spent 

 several days during the early part of July. The collecting was done 

 on both the Mississippi and the Louisiana sides of the river. My next 

 work was done along the Big Black River, near Edwards, where the 

 railroad leading to Jackson crosses this stream. 



At Jackson, Miss., a very thorough search was made of Pearl Eiver 

 and the ponds and small streams of the vicinity. A portion of the 

 collection was made at this point about the middle of July, and another 

 portion about the middle of August. In the latter month a day was 

 spent along the Big Black at Yaughan's Station, along the !New Orleans 

 and Chicago Railroad, in Yazoo County. Another day was devoted to 

 seining in the Yalabusha River, at Grenada, in Yalabusha County ; and 

 this ended my work in that region for the season. 



I have iucluded also a few species that were sent to me from Enter- 

 prise, Miss., on the Cbickasawha River. One of them, Labidesthes sic- 

 culuSj had not previously been obtained from that part of the State, 

 while the other specimens enable me to give more complete descriptions 

 than have yet been given of the species to which they belong. 



In this paper I enumerate Gl species, 5 of which I describe as new to, 

 science. One new genus is established, belonging to the Cyprinidaj. 



ETHEOSTOMATHXE. 



1. Ammocrypta vivax, sp. nov. 



In form and general appearance closely resembling A. pcUucirfa (Bd.) 

 Jor. Body elongated and terete. Depth in the length, 7 times or more. 

 Head contained in the length 4 times. Snout gradually decurved ; inter- 

 maxillaries protractile. Mouth moderate, horizontal, the maxillaries 

 reaching back to a vertical from the anterior border of the orbit. Teeth 

 on the vomer, intermaxillaries, and mandibles rather weak. Eye equal 

 to the snout, and contained in the length of the head 3 J times; interor- 

 bital space narrow. Cheeks densely covered with small scales. Oper- 

 clcs overlaid with a few rather large scales. 



Body completely covered with small, usually strongly ctenoid scales, 

 except the regions immediately in front of and behind the bases of the 

 paired fins. There are C5 rows of scales running across the distinct 

 lateral line. Of the horizontal rows of scales, G lie above the lateral lino 

 and 10 below it. 



The rays of the fins are as follows: D XI, 10 ; A 1, 9. The spinous and 

 soft dorsals are separated by a space equal to one-half the length of the 

 head. The two portions of this fin are about equal in height, the longest 

 ray of each being contained twice in the length of the head. The base 

 of the spinous dorsal is four-fifths the length of the head ; that of the soft 

 dorsal about one-half the same unit. The anal is short and high, its 

 base less than one-half the head, while the longest ray is equal to three- 

 fourths the head. As to position, the spinous dorsal begins at a point 



