STALK-EYED CRUSTACEA 321 



Synopsis of the Genera. 



I. Buccal cavity more or less triangular. 



A. Carapace narrow in front. — {Cydodorippe^ 



B. Carapace with a rostrum, 



a. Ocular peduncles are developed, but there is no 

 cornea. — {Cymoiionnts.) 



b. Eyes normally developed. — {Cyniopohis.) 



II. Buccal cavity nearly quadrate. 



C. Carapace broadly transverse, with dentated, not 

 spinous front. 



c. Genital orifice of female is on the second sternal 

 segment. — {Cyniopolia.) 



I. Buccal cavity more or less triangular : — 



I. Cyclodorippe. 



Cyclodorippc .... A. Milne Edwards. 



The carapace is narrow in front and behind, its 

 lateral borders are regularly rounded ; the greatest width 

 is about the middle. The eyes are short and retractile ; 

 the partition of the orbit is not notched. The buccal 

 cavity is prolonged into a canal that reaches the level 

 of the front, but it is valved almost to its extremity below 

 by the external maxillipedes, of which the fourth joint 

 is very long. There is no pterygostomian notch for 

 the entrance of water to the gills above the insertion 

 of the first pair of legs. The abdomen of the male is 

 very small, six-jointed, and received into a deep groove 

 in the sternum, it does not reach the second sternal 

 joint ; of the female, it is large, also of six pieces, with 

 parallel edges ; its last segment is large, and reaches 

 the base of the first pair of legs. 



