THE MOUNT DESERT REGION 231 



CYPRroopsis Brady 



C. VIDUA (0. F. Miiller). (G. 0. Sars, 1925, p. 135, pi. 63.) 

 One specimen taken in Witch Hole Pond. 



Cytheridae 

 Key to the suh families of Cytheridae 



1 Gnatliobase of the mandible much 



elongated, styliform Paradoxostomatinae 



Gnathobase of the mandible normal . . 2 



2 Hinge of shell with terminal closing 



teeth ^ 3 



Hinge Mdthont closing teeth 4 



3 First antenna with unguif orm setae . . Cj'therinae 

 First antenna without unguiform 



setae Loxoconchinae 



4 First antenna 5-segmented 5 



First antenna 6-segmented 6 



5 Limbs 5 to 7 about the same length Limnocytherinae 

 Limb 7 much longer than limb 5 Cytherideinae 



6 Exopod of mandible much reduced . . 7 



Exopod of mandible well developed . . Bythocytherinae 



7 Posterior margin of shell produced. . Cytherurinae 

 Posterior margin of shell not pro- 

 duced Xestoleberinae 



Limnocytherinae 

 LiMNOCYTHERE Brady 



L. RETICULATA Sharpc. (Fig. 39.) (Sharpe, 1918, p. 806, 

 fig. 1250.) One male taken at S 23. The first record for 

 New England of this genus. The reticulation of the shell, as 

 shown in figure 39 C, consists of various sizes of low tubercles 

 so arranged as to form a polygonal pattern. 



Cytherideinae 

 Cyprideis Jones 



C. soRBYANA (Joucs). (Jonos, 1856, p. 44, pi. 4, fig. 6.) The 

 species is new to New England. One specimen taken on sandy 

 mud in about 55 feet of water. Station : D 62. 



