G8 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The two specimens obtained in the Potomac River have the following character- 
istics : 
Length (inches) 
Head in length without caudal 
Depth in length without cauda 
Eye in head 
Eye in snout 
Eye in interorbital space 
Dorsal rays 
Anal rays 
Scales in lateral series 
Scales in transverse series 
1 . 
2. 
1 - 
Ji 
4 
4i 
3+ 
3+ 
if 
4 
10 
10 
• 35 
34 
11 
10 
The dorsal fin has its origin posterior to that of the anal and is lower than the 
latter; when flexed, its extremity is opposite the tip of the anal. The ventral fins are 
small, about equal to head back of eye and half the length of the pectorals, their 
extremity reaching the anus. 
The vertical bars are 10 to 12 in number, and are sharply defined, their width being 
equal to the interspaces and slightly increasing toward the tail. They begin and end 
abruptly, not reaching the median line above or below by about half the width of the 
eye. 
The opercles, cheeks, and chin are thickly covered with dark spots, largest on the 
cheeks and opercles, and least numerous on the cheeks. 
Field notes giving the color of the fish when alive agree with Prof. Baird’s 
description. The upper parts were of a dark-green color, which faded into a reddish 
yellow on the sides and abdomen; the inferior fins were pale yellowish; the vertical 
bars were rich black, with a bluish reflection. The dorsal showed a pale tip and 
anteriorly a dark base; behind there was a jet-black rounded spot about two-thirds 
the width of the eye and involving rather more than half the width of the fin, margined 
anteriorly and interiorly by a pure white spot. 
The species appears to belong in the genus Zygoneetes, as defined by Prof. Jordan, 
which differs from Fundulus in the smaller size of the fishes, the fewer dorsal rays, and 
the origin of the dorsal behind the front of the anal. 
The two specimens secured were taken in company with a large number of fish of 
a similar size and appearance with which they were at first thought to be identical. 
These have the distinct dark crossbars, but lack the dorsal ocellus and the yellowish 
color on the under parts. The absence of these features alone would suggest that they 
are females of Zygoneetes lucice, but when taken in connection with 10 to 12 rays in the 
dorsal fin and the position of the latter anterior to the anal, must necessarily place the 
fish in the genus Fundulus. 
7. Lucania parva (Baird & Girard). Rainwater fish. 
Not given by Uhler and Lugger in the list of the fishes of Maryland. It occurs 
in about twice the abundance of Gambusia patruelis, with which it is almost invariably 
taken. Most abundant in brackish muddy ponds and tide ditches. 
Males with body olive green, the scales marked by black crescentic bands covering 
about the middle third of the exposed portion. An obscure, narrow, lateral stripe. 
Under parts and lower fins yellowish. A large elongated black spot at the base of 
dorsal anteriorly, involving about three rays and extending upwards from back to 
