FISHES OF CHESAPEAKE BAY 
327 
181. Microgobius eulepis Eigenmann and Eigenmann. Scaled goby. 
Microgobius eulepis Eigenmann and Eigenmann, Proc., Calif. Ac. Sci., 1888, p. 69; Fortress Monroe, Va. Jordan and Ever- 
mann, 1896-1900, p. 2244; Evermann and Hildebrand, 1910, p. 163. 
Head 3.9 to 4; depth 4.75 to 5; D. VII, 16; A. 17; scales probably about 50. Body elongate, 
slender, moderately compressed; head moderately large; snout short; 2.2 to 2.5 in head; eye 3.1 
to 3.4; interorbital very narrow, 10.6 to 12.1 ; mouth large, nearly vertical; maxillary reaching 
nearly opposite anterior margin of pupil, 2.1 to 2.25 in head; teeth in the jaws simple, in narrow 
bands, with the outer ones in each jaw somewhat enlarged; gill openings large, the membranes 
narrowly attached to the isthmus; lateral line not visible; scales cycloid, wanting on head and body 
in advance of first dorsal; dorsal fins well separated, the first consisting of low flexible spines; second 
dorsal and anal similar and opposite each other; caudal fin moderately long and pointed, a little 
longer than the head; ventral disk rather short, reaching only about two-thirds the distance from 
its base to origin of anal; distance from origin of ventrals to origin of anal slightly longer than 
head; pectoral fins large, 3.65 in length of body. 
Color of a fresh specimen pale bluish; head below eye bright greenish; a bright bluish blotch 
on abdomen behind pectoral fin; first dorsal pale, edged with black and yellow; second dorsal red 
at base, yellow in middle, and with a pale outer edge; other fins plain. The alcoholic specimens 
at hand have faded to a nearly uniform pale color. 
Only two specimens of this goby of equal length — namely, 50 millimeters (2 inches) — are at 
hand. The most noticeable differences between this species and M. holmesi, as pointed out in the 
discussion of the last-mentioned species, are the differences in the shape and depth of the body 
and the length of the ventral disk. When specimens are compared, it is evident, also, that the 
mouth in M. eulepis is much more vertical, but this character is difficult to describe and to use 
unless both species are at hand. 
Smith (1907, p. 368) reports that a female distended with nearly ripe eggs was taken on May 
18, 1905, at Beaufort, N. C. This is all that is known about the spawning of this goby. The 
specimens at hand, which are 2 inches in length, appear to be the largest known. The species 
appears to be a rare one. 
Habitat . — Chesapeake Bay to Beaufort, N. C. 
Chesapeake localities. — (a) Previous records: Fortress Monroe and the mouth of Hampton 
Creek, Va. (6) Specimens in collection: From the mouth on the Patuxent River, Md. ; both 
specimens at hand were taken on April 28, 1922, one with a beam trawl operated from the Fish 
Hawk, and the other along the beach with a 30-foot collecting seine. A third specimen, which 
has not been seen by us, is recorded in field notes by Lewis Radcliffe and was taken in a tow net 
operated from the Fish Hawk near Cape Charles, Va. 
141. Genus MUGILOSTOMA gen. nov. 
Type Mugilostoma gobio sp. nov. 
Body elongate, more or less compressed; head compressed; gill openings quite large, the 
membranes rather narrowly connected with the isthmus; mouth moderate, with weak jaws; the 
lower jaw thin and angular anteriorly, shaped as in the mullets (Mugil); teeth movable, in a single 
series, set on the edge of the thin jaws; ventral fins probably united, forming a sucking disk. (The 
membrane connecting the fins in the specimen at hand apparently is broken, being still present, 
however, at the base of the fins. A membranous cross fold, forming a part of the sucking disk, is 
quite evidently present.) 
182. Mugilostoma gobio sp. nov. 
Type No. 87656, U. S. National Museum; length 27 millimeters; Lynnhaven Bay, Va. 
Head 4; depth 5.25; D. VI-11; A. 12; scales about 30. Body very elongate, compressed, 
tapering gradually toward the tail; caudal peduncle 2.4 in head; head moderate, somewhat deeper 
than broad; snout very short, 6 in head; eye 2.9; interorbital very narrow, 10.6; mouth rather 
large, oblique; lower jaw slightly in advance of the upper, very thin, without evident lips, and 
angular anteriorly as in the mullets (Mugil); maxillary very narrow, reaching about middle of 
eye, 2.65 in head; teeth simple, movable, in a single series on edge of each jaw; gill openings mod- 
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