FISHES OF CHESAPEAKE BAY 
325 
Color of preserved specimens, brownish; body with about six or seven rather ill-defined, whitish 
crossbars; lateral line usually with longitudinally elongated dark spots; a few similar spots on median 
line of back in advance of dorsal; lower surface of head spotted with black; a black bar on mandible; 
ventral disk dusky, at least at base; other fins pale to slightly dusky; the dorsal fins and the caudal 
sometimes with indications of dark spots or bars; anal fin with a dark margin. 
This species is represented by 26 specimens ranging in length from 37 to 52 millimeters (lj^ to 
2 inches). This goby is named for our colleague, Isaac Ginsburg, who made many of the pre- 
liminary identifications of the present collection and first called our attention to the fact that 
apparently two species were included in the genus Gobiosoma. This led to a detailed study and 
finally to the description of this new species. This naked goby differs from its relative, G. bosci, the 
only other naked goby recognized from the Atlantic coast of the United States, principally in hav- 
ing a more slender body, generally higher fins, somewhat shorter second dorsal, and in color. The 
difference in the height of the fins is most noticeable in the ventrals composing the sucking disk. 
In G. bosci the disk extends only about half the distance from its base to the vent, whereas in the 
present species it reaches fully two-thirds the distance to the vent. In counting the rays of the 
second dorsal in G. bosci, in 49 specimens, 4 had 12 rays, 41 had 13, and 4 had 14. In 26 specimens 
of the present species, 1 had 11 rays, 21 had 12, and 4 had 13. In making these enumerations the 
first simple ray was included and the last two, which apparently are united at the base, were counted 
as one. 
Fig. 195 . — Gobiosoma gimburgi sp. nov. From the type, 45 millimeters long 
Three specimens were examined for food. In one the stomach was empty; the other two 
had fed on small crustaceans, chiefly Gammarus. A ripe or nearly ripe female occurs in a lot of 
specimens taken from May 21 to 23, 1922. 
The size attained, judging from the specimens in hand, may be somewhat smaller than in G. 
bosci, and it evidently is much less numerous. G. bosci was taken only in shallow water, whereas 
the present species, although found in shallow water, was taken principally in deeper water, reaching 
upward of 25 fathoms. Most of the deep-water catches were made with the beam trawl from October 
to March. 
Chesapeake localities. — Solomons, off Barren Island, and Crisfield, Md.; Cape Charles, lower 
York River, off Old Point Comfort, off Thimble Shoals Light, and Buckroe Beach, Va. 
140. Genus MICROGOBIUS Poey. Gobies 
Body elongate, more or less compressed; mouth quite large and very oblique to nearly vertical; 
outer teeth in the jaws enlarged, rather strong; scales cycloid or weakly ctenoid, present on most 
of the body; first dorsal with 7 or 8 spines; second dorsal and anal with 15 to 18 rays. The species 
are small and confined chiefly to the shores. 
KEY TO THE SPECIES 
a. Body rather deep, quite strongly compressed, the depth 4.7 to 5.4 in the length of body; mouth 
only moderately oblique; ventral disk long, reaching to or a little beyond origin of anal 
holmesi, p, 326 
