ISOPODA. 103 



jEga, Leach. 



The two first joints of the superior antennae very broad and com- 

 pressed, while in the two subsequent subgenera they are almost cy- 

 lindrical^). 



Rocinela, Leach. 



The Rocinelae differ from the iEgae, as just stated, in the form of 

 the two first joints of their superior antennae, but otherwise approach 

 them, as in their large eyes which approximate anteriorly(2). The 



Conilira, Leach, 



Resembles Rocinela in the antennae; but the eyes are smaller and 

 distant, and the edges of the segments nearly straight and not 

 falciform nor prominent(3). 



The last subgenus, among those of this section in which the an- 

 tennae are placed on two lines, where the tail is composed of six 

 segments, and the inferior antennae are always short, is distin- 

 guished from all the preceding by strong and salient mandibles. 

 It is the 



Synodus, Lat., 



A subgenus established on a single species(4). 



In those that follow, the tail is usually composed of but five seg- 

 ments. The length of the inferior antennae is more than the half of 

 that of the body. 



Cirolana, Leach. 

 The tail composed of six segments(5). In the 



Nelocira, Leach, 

 It consists of but five. The cornea of the eyes is smooth(6). 



Eurydice, Leach. 



Similar to Nelocira in the number of caudal segments, but re- 

 moved from it by the granulous eyes(7). 



(1) Desmar., Consid., p. 304, JEga entaillee, XLVII, 4, 5. 



(2) Desmar., Consid., p. 304. 



(3) Desmar., Consid., p. 304. 



(4) SeeEncyc. Method., article Synodus. 

 (.5) Desmar., Consid., p. 303. 



(6) Desmar., Consid., p. 302; Ndocire de Swainson, XL VIII, 2. 



(7) Desmar., Consid., p. 302. 



