some undescrihed exotic Crustacea. 197 



Cyclops (^Miiller) similis. Plate XXI. fig. 13. 



C. captivus ? Mul. 



Blueish or brownish. Eyes and a dash on each side of the head and 

 first annulus of the body red. Body ovate, a circular scale termi- 

 nating it posteriorly, and from whence arises a diminutive tail, as in 

 the other species, spiny. The eyes are double, each kidney-shaped, 

 the facets looking outwards and a little forwards. Antennae about 

 half the length of the body, many-jointed, with hairs or spines, espe- 

 cially towards the tip, those passing backwards being the longest. 

 The palpus was waved, the penultimate joint minute, the rest elon- 

 gate, and the tip terminated by a set (5) of bi- or tri-articulated hairs, 

 curved and moveable on the palpus, their appearance leaving me still 

 in doubt whether they should not be accounted claws. I believe the 

 animal used them as organs of prehension, from the mode in which 

 they were moved about. The outer edge of the last joint of the legs 

 is dentate, the teeth blunt. 



This species approaches so nearly to the description and figure of 

 C captivus of Miiller, that singular as would appear the extensive 

 range of the animal through the ocean, I hesitate considerably in re- 

 fusing to refer it to his synonymy. One of the females had a little 

 cluster of eggs, each hyaline with a pink centre, beneath the tail ; 

 they were about forty in number. The animal was found among 

 marine plants at Mauritius. 



Fig. 13, a, Magnified figure. 

 h. Left antenna. 



c. Right palpus. 



d. Tip of the palpus. 



e. The eyes. 



Cyprts {Mull.) ARisTATA. Plate XXII. fig. 14. 



Green, elongate, dorsum arched, beneath slightly concave, poste- 

 rior extremity protuberant, anteriorly furnished with minute spines. 

 Antennae 5-jointed, long bristles arising from the 3 terminal joints. 

 Posterior pair of legs furnished with a long claw directed forwards, 

 anterior pair with four claws, one being toothed and attached to a 

 minute joint which terminates the leg. 



In fresh water among Charce and Conferva, Mauritius. 



Fig. 14, a, C. aristata, magnified. 



b, View from above. 



c, Enlarged view of the spines anteriorly. 



d, Left antenna. 



e, Last joint of hind leg, witli the claw. 

 /, Fore leg. 



g, Tip, showing the minute joint and the toothed claw. 

 VOL. I. PART III. Q 



