588 CRUSTACEA [October, 



joint, which is suboval and narrower than the one before 

 it; sixth and seventh pairs reflected, and of the usual cy- 

 lindrical, elongated form. 



Length less than three twentieths of an inch. 



This is one of the many species of this class of ani- 

 mals which may be found inhabiting marine plants, Fu- 

 cus, Sec, and also Zoophytes, devouring the fabricators 

 of the latter and seeking a fugitive prey amongst the 

 leaves and branches of the former. 



Genus UNCIOLA*. 



Essential Character. 



Antennae subpediform, superiores with an articulated 

 seta at the base of the fourth joint; anterior feet mono- 

 dactyle; second pair with adactyle compressed hands; 

 cox^e not dilated. 



Natural CJiaracter, 

 Head deeply emarginate beneath the eyes to receive 

 a segment of the base of the lower antennae (ear?), and 

 projecting into an acute angle between the bases of the 

 upper antennae; eyes hardly prominent, placed on a some- 

 what advanced portion of the head, between the bases of 

 the upper and lower antennae; antenna robust, terminal 

 joint of the superiores radier longer than the preceding 

 one, furnished at base with an articulated seta, inferiores 

 rather shorter, thicker, terminal joint shorter than the 

 preceding one; thorax composed of seven segments 

 each furnished Vv ith feet, of which the first pair are lar- 

 gest, hand dilated, monodactyle, second pair with a di- 

 lated^ compressed, subequai cfirpus and hand, the latter 



