Insects, 



195 



111 Milne Edwards's arrangement the insect here described belongs 

 to the — 



Order. — Ostracoda. 



Family. — Cyproid^. 



Genus. — Cythere, Muller ; Cytherina, Lamarck. 



a, Cythere inopinata,magm&eA. 

 c, Last pair of feet. 



ft, Animal lying on its back. 



', Antenna. d, First pair of feet. 



Cythere inopinata. The shell is oblong-ovate, nearly of equal size 

 at each extremity ; white, with a slightly orange-coloured mark on 

 the upper edge ; transparent, smooth and shining, perfectly free from 

 hairs, but possessing a few, short spinous projections on the lower 

 margin of the posterior extremity. Each valve has a gibbous projec- 

 tion about the middle, which is best seen when the animal is lying 

 upon its back (fig. 5), and is sinuated on the anterior margin. The 

 antennae (fig. c) are composed of five articulations, and are furnished 

 with several shortish setae. The anterior pair of feet (fig d, the pedi- 

 form antennae of M. Edwards), are provided with the stout jointed 

 setae which I have shown all the species of this genus to be possessed 

 of, (' Mag. Zool. and Bot.' i.) The posterior legs (fig. e) are as in all 

 the other species, each pair longer than the preceding one, the last 

 pair being very long and slender. This species is very minute in size, 

 and from this circumstance, and from its always creeping at the bot- 

 tom, is easily overlooked. 



Inhabits a pond between Han well and Southali, Middlesex. 



The peculiar habit of the animals of this genus is to walk or creep 

 amongst the plants, corallines &c. amongst which they live. I have 



o2 



