THE CRUSTACE.^ OF NEW JERSEY. 193 



edge of outer uropods with about six groups of stout spines. 

 Telson with cluster of two or three spines near base and three 

 on apical edge, and another near latter close to external edge. 

 Color olive-brown to reddish-brown, and segments with edges 

 a little more deeply tinted than rest of body. Above pleopod 

 bases and first pair of uropods reddish spot. Length 25 mm., 

 and Arctic specimens reach 48 mm. 



Remarks.— Frequently found in our limits, from where it has 

 been recorded a number of times. It is very extensively dis- 

 tributed throughout practically the circum-boreal region. Along 

 the eastern Atlantic shores ranges south to the Mediterranean, 

 on our shores probably south to Virginia, and in the Pacific 

 Ocean well down the shores of both North America and Asia. 

 It appears to be most frecpiently met with near the shore, though 

 sometimes ranges into water of over fifty fathoms in depth. 



Verrill says it occurs in great numbers beneath stones and 

 among the rock-weed near low-water mark. The males are 

 much larger than the females, and sometimes become nearly 

 an inch and a half long'. They cannot leap like tlieir cousins 

 that live at high-water mark, but skip actively about on their 

 sides among the stones and gravel, until they reach some shelter, 

 or enter the water, when they swim rapidly in a gyrating man- 

 ner back downward, or sideways. But although they can swim 

 they are seldom met with away from the shore or much below 

 low-water mark. The zone of Fucus is their true home. 



Very many examples from Point Pleasant, Great Bay, Ocean 

 City and South Dennis. I have also met with it at Sea Isle City, 

 Corson's Inlet, Anglesea, Cape May, Town Bank and Dias Creek. 

 Occasionally it is found in the stomachs of smelt (Osnieriis eper- 

 lanus) in our markets. I also found it at Parmores Island on the 

 Virginia coast. 



Gammarus fasciatus Say. 



Plate 57. 

 Fresh Water Shrimp. 



Gammarus fasciatus Say, Jonrn. Acad. Nat. Sci. Phila., I, pt. 2, 1818, p. 374. 

 Our rivers, and frequently introduced into Philadelphia, in the Schuylkill 

 ivater. 



13 MU 



