54 University of California Publications. [Zoology 



for any other reason, and reference is made as a rnle only to such 

 works as are more accessible and give description of the genus in 

 question. To compensate for this, a list is appended containing 

 the names and literature references of new species in the genera 

 dealt with here, that have been recorded since the appearance of 

 Giesbrecht's last work ( '98). The synonymy of species recorded 

 here for the first time as from this region is given as complete. 



It is hoped that the arrangement of figures will at least facili- 

 tate comparisons. Drawings of like parts are on the same plates, 

 and if more than one species of a genus is dealt with, the figures 

 are grouped, it is believed, so that comparison of one with another 

 will be easy. This may be said also for different genera, since, 

 for example, the fifth feet of males or females are all on one plate,, 

 whether they belong to animals in the same genera or not. 



The following is a list of the species treated in this paper : — 



PAGE 



Spinocalanus ma-jor n. sp 55 



Gaetanus brcvicornis n. sp 56 



Gaetamis unicornis n. sp 57 



Gaetanus clarus n. sp 57 



Chirundina streetsi Giesbrecht 59 



EucMrclla curticauda Giesbrecht 59 



Euchaeta californica n. sp 60 



Euchaeta proiiinqiia n. "sp 61 



Euchaeta tenuis n. sp 61 



Euchaeta sj)inifera n. sp 62 



Euchaeta dubia n. sp 63 



Euchaeta tonsa Giesbrecht 64 



Scolecithrix frontalis Giesbrecht 65 



Scolecithrix magna (Scott) - 66 



Scolecithrix inornata n. sp - 67 



Xanthocalanus similis n. sp 68 



Metridia princeps Giesbrecht - 69 



Metridia atra n. sp 70 



Metridia ignotu u. sp 71 



Disseta grandis n. sp 72 



AugaptUus rostratus n. sp 73 



Arietellus major n. sp 74 



Labidoccra jollae n. sp 74 



Pontellopsis occidentales n. sp — 76 



Calanus robustior Giesbrecht 77 



Eeterorhabdus longicornis Giesbre:-ht 77 



Heterorhabdus spinifrons Glaus 77 



