ISOPODS OF NOETH AMERICA. 271 



e. Terminal segment of abdomen entire. 

 /. Maxillipeds with second, third, and fourth articles of the palp not 



produced into lobes Genus Sphteroma Latreille 



/'. Maxillipeds with second, third, and fourth articles of the palp pro- 

 duced into lobes Genus Exosph;eroma Stebbing 



e' '. Terminal segment of abdomen with a median ernargination. 

 /. Second, third, and fourth articles of palp of maxillipeds produced 



into lobes -. Genus Dynamene Leach 



/'. Second, third, and fourth articles of palp of maxillipeds not produced 



into lobes Genus Paradynamene, new genus 



d'. Outer branch of uropoda not capable of folding under inner branch; 

 branches unlike, only outer one salient Genus C'dicaea Leach 



48. Genus ANCINUS Milne Ed-wards. 



f 



Abdomen composed of two segments, the first segment formed by 

 the fusion of several segments. 



Outer branch of the uropoda entirely wanting. 



First and second pairs of legs subchelate; remaining pairs ambula- 

 tory. 



ANCINUS DEPRESSUS (Say). 



Nsesa depressa SAY, Jour. Acad. Nat. Sci. Phila., I, 1818, pp. 483-484. RICHARI- 

 SON, American Naturalist, XXXIV, 1900, p. 224; Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 537. 



Locality. Egg Harbor, New Jersey. 



Depth. Found on surface. 



"Body broad, depressed, linear; first caudal segment concealed, 

 second attenuated; anterior feet monodactyle. 



"Inhabits Egg Harbor. 



"Cabinet of the Academy. 



"Body broad, depressed, punctured, sides parallel; segments sub- 

 equal, anterior ones rather shorter; first segment of the tail not visible, 

 second equal, as long as the three preceding visible ones, attenuated 

 to an. obtuse point, which is carinated above and attained by the lateral, 

 spiniform, acute processes; beneath concave, effuse at tip; eyes appar- 

 ently lunated, but really rounded', with distant granules, and touching 

 the anterior segment of the body; hands of the anterior feet dilated, 

 ovate, thumb as long as the palm, nearly attaining the carpus, tip 

 closing within a prominent spinose tooth on the base of the palm; 

 hands of the second pair cylindric, incurved, with a process dentate 

 at tip and placed at the inner base, armed with an equal incurved 

 thumb not closing on the hand, obtuse, and furnished with a seta at 

 tip; remaining feet ciliated. 



"Length half an inch, breadth rather more than one-fifth of an inch. 



"Found with the preceding species, common." SAY.*" 



oJourn. Acad. Nat. Sci. Phila., 1, 1818, pp. 483^84. 



