240 REPORT OF NEW JERSEY STATE MUSEUM. 



Maxillipeds with palp of five segments. Mandibular palp formed 

 of three segments. First thoracic segment slightly longer than 

 others, which latter subequal. All segments with small epimera 

 at anterior lateral angles of segments. Abdomen formed of two 

 short segments, seen only in middle of dorsal surface, and large 

 terminal segment, its hind lateral angles rounded and hind edge 

 slightly produced as broad triangular process between uropoda. 

 Latter about long as terminal abdominal segment, and peduncle 

 about long as inner rami, which latter broad and tapering 

 narrowly to acute end. Outer rami of uropoda about half 

 width of inner, also tapering to narrow pointed end. Female 

 with first pleopoda attached close together. First pair of legs 

 prehensile, with propodus greatly expanded, and lower edge pro- 

 duced in one long and one short triangular process. All other 

 legs ambulatory. Color brownish above, much paler below. 

 Above spotted and mottled more or less in some specimens, with 

 dull yellowish tints. Length (without uropoda and antennae) 

 15 mm. 



Remarks. — This usually abundant species in most of our fresh 

 waters ranges from Massachusetts to Virginia, Mississippi and 

 Michigan. It is most frecjuently found in quiet water, as pools, 

 ponds and lakes, or slow-running streams, under stones. In this 

 State I have found it common, sometimes in great numbers at 

 various of the following places : Cold Spring Inlet, Nummy 

 Town, Fishing Creek, Pond Creek, New England Creek, Coxe's 

 Hall Creek, Goshen Creek, Crooked Creek at Cape May Court 

 House, Dennis Creek near Bouth Dennis, Diennisville, Dias 

 Creek, Palermo, Cedar Swamp Creek, Bridgeton, Pitman, 

 Mantua, Wenonah, Camden, Pensauken, Turnersville, Berlin, 

 Atco, Hammonton, Speedwell, Delanco, Burlington, Florence, 

 Trenton and Lake Hopatcong. Mr. W. T. Davis found it at Ter- 

 race Pond, and says it is common in most ponds and slow-flowing 

 brooks of Staten Island, New York. 



The following notes and associations which I have gathered 

 may be interesting. 



Abundant with Gammarus fasciatiis, Umbra pygmcea, Fundulus 

 heterocIiUis uiocrolepidotus and F. diaphamis in Crooked Creek 



