NO 1222. ISOPODS OF THE ATLANTIC COAST— RICHARDSON. 



527 



Fig. 11. — jEGATHOi 



M EDI .i LIS. 



Say's species is clearly not a Cymothod^ and can bo placed with no 

 other genus of the Cymotho'da' than ^Egatlioa^ because of the ciliated 

 uropoda and ciliated terminal abdominal segment. 



Although nothing is said of the antennje in the meager description, 

 the species can hardly be placed among the ^Eguhe, because of the 

 long iil)dominal segments which are equal in length to the posterior 

 thoracic segments, the head trilobate behind, regularly 

 rounded before, and terminal segment hardly ])road(n- 

 than preceding segment. 



71. iEGATHOA MEDIALIS Richardson. 

 yE(/«</ioa»ierf(a//.s Richardson, Am. Nat., XXXIV, 1900, p. 220. 



Body narrow, elongate; abdomen not narrower than 

 thorax. 



Head, with anterior margin, ])roadly rounded in 

 front; central portion sharply raised above lateral 

 portion, which is deeply' excavate just in front of eyes. 

 Eyes large, occupj^ng two-thirds the width of the 

 head. First pair of antennae eight-jointed; second 

 pair more slender, equal in length, and nine-jointed. 



First three segments of thorax subequal, last four subequal and some- 

 what shorter than first three. First five abdominal segments equal in 

 length. Terminal segment rounded posteriorh'. Uropoda longer 

 than terminal segment; branches unequal. Outer branch the longer; 

 inner branch obliquely truncate. Legs similar in structure, with 

 curved dactyli. Color, light brown, densely covered with black spots. 

 Single specimen from Barren Island, Chesapeake Ba}'. 



Depth.— ?> to 25 fathoms. 



Type.—C^t. No. 23y04, U.S.N.M. 



26. NEROCILA Leach. 



ANALYTICAL KEY TO THE .SPECIES OF XEROCILA. 



«. Head nmnded like a circle in front; eye^> indi.stinft, oV)«'ure. Terminal segment 

 cordate, acmninate, lightly carinated. I'ropoda scarcely longer than the ter- 

 minal segment; inner branch much shorter and widt-r than outer branch, 

 acuminate; outer branch narrow, scythe-shaped. 



72. Neroeila acummata Schioedte and Meinert. 



«^. Head subtruncate in front. Eyes distinct, black. Terminal segment regularly 

 rounded, not carinated. Uropoda much longer than terminal segment; 

 inner branch narrowly oval, obliquely truncate, and shorter than outer branch; 

 outer branch narrowly ovate or lanceolate 73. Ncrocila iminda Harger. 



72. NEROCILA ACUMINATA Schioedte and Meinert. 



Neroeila aaiininaia Schicedte anu Meixert, Xaturhistorisk Tidsskrift, XIII, 

 1881-1888, pp. 48-50, pi. in, figs. 5-6. 



Habitat. — Atlantic Ocean and Gulf of Mexico; St. Anna. Mexico; 

 Louisiana; Pensacola and St. ]Marys River, Florida; Fort Macon, North 

 Carolina; New Point, Virginia. 



