THE CRUSTACEAl OF NEW JERSEY. 195 



several fascicles of hairs, and no spines except cluster near tip 

 of closed dactyliis. Second pair of gnathopoda in male with 

 carpus little longer than first pair, and three or four spines on 

 each side near tip of closed dactylus. Second gnathopods of 

 female with carpus and hand smaller than in male, and moderate 

 in length. Perasopods with long fine hairs posteriorly, and last 

 two pairs of these limbs longest, third pair being shorter than 

 fourth and fifth. Posterior pair of pleopoda with subequal rami, 

 longer than preceding. Color in life mostly pale to translucent 

 brownish, though examples agreeing with Say's account are met 

 w'ith. These usually show very pale greenish streaks and the 

 appendages with similar-colored blotches. Length 10 to 15 mm. 



Remarks. — This is our common "fresh-water shrimp" 

 throughout the Middle Atlantic States. It probably occurs also 

 throughout New' Jersey, though at present I have met with it 

 only in Cedar Swamp Creek near Petersburg Bridge, Bass River 

 near New Gretna, Alcyon Pond at Pitman, Crooked Run near 

 Cape May Court House, Pensauken, Camden, Florence, Bur- 

 lington and Trenton. In all these localities it was found entirely 

 in fresh water, and seems to be equally abundant throughout 

 the year. 



I have examined a number of specimens from Staten Island, 

 New York. These were obtained from the water-supply and in 

 springs, by Mr. W. T. Davis. He also obtained it in Terrace 

 Pond, New Jersey. 



In Pennsylvania it is common in very many sections. My 

 specimens are from Philadelphia, Holmesburg. Bristol, Glad- 

 wynne, Naylor's Run. Jacoby Creek at Mt. Bethel, Monocacy 

 Creek at Bethlehem and Pocopson. In Delaware I secured 

 it near State Road and at Wilmington. In Maryland it was 

 common at Denton, the Pocomoke River at Willards, Bohemia 

 Manor, Broad Creek and Deer Creek at the Rocks. In Ver- 

 ginia I found it on Chincoteague Island and in Locustville 

 Branch. It is frequently abundant in springs, often in trout 

 streams, and doubtles forms a good portion of the food of 

 many of our predatory fresh-water fishes. Among aquarists 

 it is in demand as fish food. Considerable variation is found 



