THE FISHES OF NEW JERSEY. 225 
rounded, a little anterior. Mouth oblique, and mandible pro- 
jecting. Maxillary small, not reaching orbit. Teeth minute in 
jaws. Interorbital space narrow, flat. Gill-rakers rather long 
and large, in moderate number. Gill-membranes free from 
isthmus posteriorly. No dermal bony plates along sides. Small 
plates along bases of dorsal and anal, and on caudal keel. Skeletal 
plates not covered by skin. Postpectoral plate well developed and 
striate. Thoracic processes well developed, widely divergent, and 
forming a U-shaped figure. Bones of skull granulate, surface 
bones all weak. Pubic bone feeble, not carinated, lanceolate, edge 
raised, lanceloate and median part thin. First dorsal spine in- 
serted before base of pectoral, tenth a little the larger and longer, 
and basis of fin a little less than distance from base of last spine 
to base of caudal. Rayed dorsal inserted nearer base of caudal 
than posterior margin of eye, elevated anteriorly. Anal similar 
to rayed dorsal, and spine detached in front. Caudal lunate. Pec- 
toral broad, reaching nearly as far back as tip of ventral spine. 
Ventral inserted about opposite base of fourth dorsal spine and 
reaching half way to anal. Color olivaceous above, punctulate 
and irregularly barred with darker. Below silvery. Length 2 
inches. Beesley’s Point. 
This is the only example I have seen. It is,a northern and 
widely distributed species, abounding in mountain lakes and 
streams, and in both fresh and brackish waters. Writers refer to 
it as the nine-spined stickleback, though the above example has 
ten, a character, together with its slender form, which will at once 
serve to distinguish it from any other species. 
Pygosteus occidentalis Abbott, Geol. N. J., 1868, p. 815. 
Pygosteus dekayi Abbott, 1. c. 
Genus GASTEROSTEUS Linnzeus. 
The Two Spined Sticklebacks. 
Gasterosteus bispinosus Walbaum. 
Stickleback. Two Spined Stickleback. New York Stickleback. 
Head 31%; depth 4%; D. II-I, 1, 10; A. I, 1, 8; scutes 30; 
mandible 3% in head; first dorsal spine 3; first dorsal ray 2; 
I5 MU 
