Jordan and Evermann.— Fishes of North America. 1061 



Both dorsals and aual high and long; caudal notched ; ventrals well sep- 

 arated ; anal with one feeble spine. This genus differs from Ammon-^mla 

 chiefly in having the premaxillaries nonprotractile. The vertical fins are 

 much more developed than in the latter genus, there l»eing 14 dorsal 

 spines and 12 soft rays in the anal fin. The squamation is much more 

 complete than in Ammocrmnn, but the body is similarly hyaline. The 

 single species is one of the largest of the darters, much larger than the 

 species ot Jnimocn/pta or Toa, resembling species of Hadropterus in habit. 

 (Kpvarn'XXo^, crystal.) 



1*49. t'BTSTALLARIA ASPRELLA'(Joraan). 



Head long and slender, 4i to 4i; depth 7 to 8 ; eye large. D. XII to 

 Xiy-13 to 15 ; A. I, 12 to 14 ; scales 7 to 10-98 to 100-10 (83 to 85 in speci- 

 mens from Alabama). Body long, slender; mouth not large, subterminal 

 horizontal; premaxillaries not protractile; opercular spine well devel- 

 oped. Squamation much more complete than in Ammocrijpta pellnchla, the 

 scales very small and quite rough, largest posteriorly; cheeks and oper- 

 cles with pectinate scales ; throat and belly naked, the space between 

 the ventrals scaled ; back of neck scaled. Fins large ; the dorsals well 

 separated, the spinous high, highest in front; second dorsal smaller, 

 smaller than anal ; anal spine high, flexible ; caudal lunate. Color hya- 

 line olive, with 3 or 4 dark, broad cross bands meeting over the back, 

 the width of each of the first 3 about equal to depth of body, the fourth 

 narrower, all extending somewhat obliquely downward and forward to 

 the lateral line ; a dark lateral band along side, made up of about 10 

 more or less confluent dark quadrate blotches, darkest where it passes 

 through the cross bands. Southern Indiana and Illinois to Arkansas and 

 Alabama, chiefly in the larger, clearer streams, where it is found in the 

 swift currents. Recorded from the Ohio River, at Rising Sun (Jenkins) ; 

 Wabash River, at New Harmony, Vincennes, and Terre Haute (Ever- 

 ma^in); Green River, Kentucky (Woolmau) ; Chocolo Creek, Alabama 

 (Kirsch); and Washita River, Arkansas (Jordan & Gilbert), besides the 

 original locality in Illinois, where it was first obtained by Dr. Forbes. 

 A singularly interesting fish, {asprellus, a diminutive ot Aspro.) 

 Plewohpis a^prelln.'^ *JoRVAS, Bull, ii, III. Lab. Nat. Hist., 38, 18T8, rocky tributary of Mis- 

 sissippi River in Hancock County, Illinois. (Coll. Forbes.) 

 Ammocrypla nsprella, JoRD.tN A Gilbert, S.vnop8i.s, 490, 1883. 

 Etheostoma asprellus, Evermann A Jenkins, Proc. U. S. Nat. Mus., 1888, 56. 

 Orystallaria aspreUns, Boulenger, Cat., I, 104. 



473- AMMOCRYPTA, Jordan. 

 (Sand Dahteks.) 



rieurolepis, Ar.ASsiz, Bull. Mas. Comp. Zoiil., i, 5, nGi,{penuculus}, (uot PleiirolepL<:, Eoerton. a 



genus of extinct Ganoids). 

 Anwiorri/pta, JORDAN, Bull. U. S. Nat. Mus., x, 6, 1877, (beaitii). 



Body slender and elongate, subcylindrical ; pellucid in life. Head slen- 

 der. Mouth rather wide, terminal, horizontal, the lower jaw included; 



*In the original di>seription, copied in .Tordan & Gilbert, Synopsis, 490, the count of fln rays 

 of Ammocrypta pellHcida was, by a slip, substituted for that of CryUaltaria atprella. 



