812 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 
The radial formula in this fish is: D. III—11; C. 6—19—6; A. 1II—7. 
Vv. 7. The vertebree are: D. 13; C. 17. Centra between the lines of 
the first interneural and first interhemal spines, 10. Ten rows of small 
scales visible above the vertebral column. 
The general form of the fish is stout, and the caudal peduncle is deep, 
The top of the head is convex, and the eye large. The front descends 
abruptly to the rather projecting muzzle in the specimen, but whether 
this is a distortion or not is uncertain. The coracoid is wide and well 
produced backward, while the clavicle is, as usual, directed forward. 
The femur* is slender, and connected with its fellow by a posterior 
transverse bar. The greatest depth is a little less than one-fourth the 
length without the caudal fin. The diameter of the eye is one-fourth 
the length of the head. The origin of the ventral fin is in advance of 
the first dorsal ray; the origin of the anal is below the penultimate 
dorsal ray. The caudal fin is openly forked. 
Measurements. 
M. 
NOtallen Ph. sec cawihos shee ede twee eeke esha aade cee a eee ee 0.061 
Length-of Héadin cows adic ciscetes cchaee sevice wnseden eee cece etwas seaeee Dose eck 0.016 
Length-to line of ventral fin 2. ck. guises Sceeee suede Gee ceideG Geese Geseale danse 0.020 
Length bo line-of dorsal fing... ieee scee sic see ciecce Fb cele secssreieoereen oatee sae ~~ 0.022 
Length to line of anal fin ...2.. 2.220 eee wee ene cece ee cece fate garerdnreaiginawcwredivys 0.031 
Length to base of caudal fin...-.. ...c2. eee e cece ee eee ne eee cee cece cone eens 0.048 
Depth-at-caudal peduncle. s-1cccssc cee ve cune sos oni bess ge soeeesndscseieece ewes 0.008 
Depth at dorsal spine..........--2. ceecce eee Sawa dwbesewieadadndeceesalncces 0.011 
The more numerous rays of the dorsal fin and more numerous scales 
are among the characters which distinguish this species from the two 
heretofore known, It is dedicated to Dr. Frederick M. Endlich, geolo- — 
gist in charge of one of the parties of the United States Geological Sur- 
vey of the Territories under Dr. F. V. Hayden. 
AMPHIPLAGA BRACHYPTERA, Cope, gen. et sp. nov. 
Char. gen.—Generally as in Hrismatopterus, but with strongly ctenoid 
scales. The dorsal fin is over the abdomen, and is supported by a few 
' strong, adherent spines in front, which rest on stout interneurals; the 
soft rays have no interneurals, either in this fin or the anal. They are 
present in Hrismatopterus.. The ventrals originate a little in advance of 
the line of the dorsal, and the caudal fin is deeply forked. This genus 
approximates Aphrodedirus. 
Char. specif.—Radii: D.II—8; A.III—4. Vertebre of the caudal series 
15. Scales: transverse row, 22; longitudinal row behind first interneural 
bone, 40. The only specimen I possess lacks the head, so that various 
_ characters cannot be ascertained. The depth of the body at the first 
dorsal spine enters the length from that point to the base of the caudal 
fin two and a half times, giving a general form of medium proportions. 
*Before the homologies of these bones were studied, authors frequently called them 
pubes. ; 
