CYPRIDINA. 177 



structure from, the second pair of feet in the Cypris. 

 Only one species has been described by M. Edwards, a 

 native of the Indian Ocean ; but in the ' Ann. and Mag. 

 of Nat. Hist.' for December 1847, I described two addi- 

 tional, one of which is a native of the Atlantic Ocean, and 

 the other an inhabitant of the Scottish seas. 



Anatomy, 8fc. — The eyes are two in number, situated 

 nearly in the middle of the body. They are each placed 

 upon a lengthened conical pednncle, are of an ovoid shape, 

 and are composed of about twenty crystallines. 



The first pair of antennae (t., XXIT, f. e) is large, and 

 consists of five articulations, the last of which is short, and 

 terminated by several long filaments ; the second pair 

 (t. XXIII, f. c) is shorter, and is formed of the same 

 niuuljer of joints, each furnished with several setae. 



The mandible is a flat plate, arm^^d at its extremity 

 with three or four sharp teeth. The first pair of jaws is 

 composed of a large body with three or four appendages, 

 hke fingers, armed with stout cilia, and having attached 

 to each a large branchial plate (t. XXIII, f. y) furnished 

 with fifty finely plumose seta^. The second pair (t. XXIII, 

 f. d) consists of an oval i)late, divided into three articula- 

 tions, and armed with numerous short setae. 



The natatory feet (t. XXII, f. b) are peculiarly-formed 

 organs, having as the basilar joint a large fleshy body, 

 which gives oft' from its upper edge a long, slender branch, 

 composed of eight articulations, furnished Avith long plu- 

 mose filaments, and a small appendage from its anterior 

 margin, formed of two short articulations. The oviferoiis 

 feet (t. XXII, f./) are long and slender bodies, cylindrical, 

 twisted, divided into very numerous short joints, and 

 furnished near the upper third of tlieir length Avith several 

 sharp, stout, serrated spines. 



The abdomen (t. XXII, f. <j) is terminated by a large 

 caudal plate, which is broad, and armed at its extremity 

 and inferior edge with several stout serrated hooks or claws. 



Very little is known of the habits and manners of these 



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