THE CRUSTACEA OF NEW JERSEY. 175 



the tube, while the third, fourth and fifth perseopods, holding on 

 with their opposing hooked tips, pull the posterior part of the 

 peraeon back over the pleon, and then the first gnathopods help to 

 complete the evolution. The tubes are. usually kept quite free 

 from foreign growths. He was unable to discover, however, 

 how the diameter of the tube is enlarged to accommodate the 

 growing animal, but thinks it is probably accomplished by build- 

 ing on a larger portion at one end and pulling to pieces the other 

 end until the whole tube is reconstructed. 



According to Smith, in life, a large portion of the animal ap- 

 pears almost black from the crowding together of numerous 

 specks of very dark purplish pigment. The first segment of 

 the peduncle of the antennula nearly all colored in this w.ay, 

 and broad band of same character at distal end of each of other 

 segments of peduncle. Proximal segments of antenna also dark- 

 colored, and broad band of color at distal end of fourth seg- 

 ment. Other parts of peduncles of antennulae and antennae semi- 

 transparent, and so with flagella. Head and whole anterior and 

 middle portions of body and epimera, more or less colored in 

 same way, as also gnathopods and bases of first and second 

 peraeopods. Distal portions of these per^eopods, whole of third, 

 fourth and fifth pairs, and caudal appendages semi-translucent 

 and nearl}^ or quite devoid of pigment. 



Genus COROPHIUM Latreille. 



Corophium Latreille, Gen. Crust. Insect., I, 1806, p. 58. Type Gaminanis 



longicornis Fabricius, monotypic. 

 Podocerus Leach, Edinburgh Encyclop., VH, 1814, p. 433. Type Podoccnts 



variegatiis Leach, monotypic.^ (Not consulted.) 



Body comparatively stout, much depressed, with extremely 

 small coxal plates of whicli first pair conically produced and 

 tipped by number of strong ciliated bristles. Cephalon rather 

 broad, with lateral lobes narrow and more or less projecting 

 between insertions of antennae. Urosome flattened, segments 

 sometimes coalesced. Eyes small or imperfectly developed, 

 placed at base of lateral lobes of cephalon. Antennae rather 



'Leach, 1. c. Am. Ed., VH, 1815. p. 272. 



