THE MOUNT DESERT REGION" 233 



the curvature of the hinge line indicates that permanent con- 

 tact of the valves is made only at the two ends of the middle 

 pair of flanges, as in Pontocypris. 



The penultimate segment of the first antenna has the two 

 distal claws set on distinct processes of the segment. 



The exopod of the second antenna is similar in the two 

 sexes. The lateral comb of the distal segment of the endopod 

 described by Cushman is peculiar to the male, and so far 

 known nowhere else in the Cytheridae. This segment is rela- 

 tively more slender in the male than in the female, and the 

 proximal claw is situated basally in the male and subtermi- 

 nally in the female. The basal segment of the second antenna 

 has a prominent brush of long hairs on the ventral margin. 



The epipod of the mandible has 1 long seta, 3 rudimen- 

 tary ones, and a knob. 



This genus is named for Dr. Joseph Augustine Cushman, 

 of Sharon, Mass., in recognition of his pioneer work on New 

 England ostracods a quarter of a century ago and his per- 

 sonal kindnesses to the writer. 



C. SEMINUDA (Cushman). {Cytheridea s. Cushman, 1906, 

 p. 374, pi. 33, figs. 62-64; pi. 34, figs. 76, 77.) This species is 

 the monotype of the genus. We have taken it in about 8 feet 

 of water on a sandy bottom at S 21. 



Cytheretta G. W. Miiller 



C. TRACYi Blake. (Blake, 1929, p. 18, fig. 9.) Taken in 

 some numbers on mud bottoms in 10 to 40 feet of water. 

 Stations : D 59 ; P lOB. 



EucYTHERE Brady 



E. DECLivis (Norman). (G. 0. Sars, 1925, p. 163, pi. 75, 

 fig. 2.) A few taken on sandy bottom in 6 feet of water at 

 S 21. The genus is new to New England. 



