Crustacean of the Genus Zia. 



287 



that the uropoda, or tail-appendages, were quite different, not 

 only from those of any species of Philoscia described by- 

 Messrs. Bate an*^ Westwood, but also from those of any of the 

 Aerospirantia described in their work. In the next place, it 

 turned out that the antennte possessed fifteen joints, the 

 fiagellura being composed of ten articulations. My impres- 

 sion that it must therefore belong, not to Philoscia^ but to the 

 genus Zia as described by Koch, has been kindly confirmed 

 by Mr. Spence Bate, who will himself in due time publisii a 

 communication on the subject. 



A. Zia Saumlersii. a. tail-appendages ; b. antenna. 

 Meanwhile the following characters will probably suffice 

 to identify the species : — Figure ovate. Cephalon rounded. 

 Outer antennas cylindrical and fifteen-jointed, the ten terminal 

 joints forming the fiagellura, which is tipped with an articulus ; 

 all the joints armed with bristles. Tail-piece narrower than 

 the terminal segment of the body ; terminal segment of the 

 tail-piece quadrate, its lower border forming a very obtuse 

 angle. The uropoda, or caudal appendages, almost entirely 

 exserted, the basal portion having a finger-like prolongation 

 on the inner side, from the extremity of which extends a thin 

 ramus, itself terminated by a seta as long as the ramus or 

 longer ; a minute hair projects from the ramus close to the 

 starting-point of the long seta. The outer ramus thicker and 

 longer than the inner one, but, with its short terminal seta, not 

 equal to the combined length of the inner ramus and its long 

 seta. A stout bristle projects from the outer angle of the 

 uropoda, and is about half as long as the basal portion above 

 described. 



