14 Universitij of California Publications. [Zoology 



KEY TO GENERA AND SPECIES. 

 A. Shell more or less elongated ; rostral process well developed. 



B. Basal join of secondary branch of antenna without mamniillary 

 process; chewing pad of mandible without distinct setae and 



spinous teeth Genus ArchiconcJioecia 



A. striata 



BB. Basal joint of secondary branch of antenna with a mammillary 

 process; chewing patl of mandible possessing setae and teeth 

 Genus Conclioecia 



V. Without a conspicuous spine at postero-dorsal angle. 



D. Shell longer than 2 mm. 



E. Postero-dorsal angle prominent, smaller than 

 a right angle C. jmciflca 



EE. Postero-dorsal angle obtuse, greater than a 

 right angle. 



F. Hooked appendage of secondary branch 

 of right male antenna with two abrupt 

 bends C. magna 



¥F. Hooked appendage with only one ab- 

 rupt bend C. hi/alophyllum 



DD. Shell less than 2 mm. in length. 



E. One or more of the sensory filaments of the 

 antennule furcate C. clausi 



EE. None of the sensory filaments of antennule 

 furcate C. spimrostris 



CC. Shell with a more or less conspicuous spine at postero- 

 dorsal angle. 



D. With a blunt projection at postero-ventral angle 

 - C. ritteri 



DD. Without a blunt process at postero-ventral angle. 



E. Shell very much elongated and narrow, three 

 to five times as long as high C. daphnoides 



EE. Shell not greatly elongated, about twice as 

 long as high C. millleri 



AA. Shell ahnost as high as long ; rostral process short and inconspicuous, 



furnished with a hinge process Genus Halocypris 



H. pelagica 



