6 & 
58 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
DESCRIPTION OF ANEW FISH FROM ALASKA (URANIDEA MICROS- 
TOWA). 
By W. N. LOCKINGTON. 
Uranidea microstoma. 
Body long and low, little compressed. 
Head depressed, rather small, wider than deep; anterior portion of 
body about equal in width and depth, somewhat flattened on back near 
head, and gradually becoming more and more compressed posteriorly. 
Dorsal outline regularly arched, its highest point at origin of first 
dorsal; abdominal outline nearly straight in some examples. 
Head about 42 to 44; breadth of same 54 to 44 times in the total 
length; orbit about 5, snout 4 to 34 times in the length of the head. 
Hyes directed upwards, elliptical, the orbits not elevated above the 
general surface; interorbital width nearly equal to the transverse diam- 
eter of the orbit. 
Mouth short, small compared with others of the genus; posterior 
extremity of maxillary a little beyond the front margin of the orbit; 
upper margin of maxiJlary hidden behind the preorbital in the closed 
mouth, except the short, broad, posterior extremity, which is free. 
Lower jaw shorter than the upper, and closing within it. 
A broad band of villiform teeth in front of both jaws. 
Teeth on vomer, none on palatines. 
Subopercular spine much developed, directed forwards; preoper- 
culum ending in a single sharp, straight spine; branchiostegals 5. 
First dorsal commencing a little behind the pectoral base, low, the 
upper margin nearly straight; height less than that of second dorsal, 
the rays nearly equal in length. 
Second dorsal commencing above the vent, first ray shorter than the 
second; upper margin a straight line, the heehee of the fin diminishing 
regularly but slowly posteriorly. 
Anal shorter than second dorsal, commencing opposite the third and 
ending opposite the seventeenth ray of that fin; anteriorly rounded, 
the rays increasing to the fourth, thence somewhat diminishing poste- 
riorly ; depth greater than the height of the second dorsal. 
Pectoral wedge-shaped, seventh ray longest; rays fleshy, simple; tip 
of seventh ray reaching about to the vent. 
Ventrals inserted a little behind insertion of pectorals, the tips not 
reaching the vent, consisting of one spine and four rays; second, third, 
and fourth rays longest. 
Caudal slightly convex on its posterior margin when expanded ; the 
rays twice bifurcate, first bifurcation at about a third of their length 
. from the base. 
Vent not separated from the anal fin by any consider ae space; rays 
simple. 
