^°^- ^J ■ Esterly. — Copepod Fmina. 57 



G. brevicorms resembles the female of G. armiger Giesbreeht 

 chiefly in the form of the head. There are specific differences in 

 the posterior maxilliped, in which the lamella on the basal joint 

 is longer and more prominent than in G. miles, while in G. ar- 

 miger it is only indicated. There is no reason for considering G. 

 brevicornis the same as G. major Wolfenden or G. caudani Wol- 

 fenden (Canu?), since the lamella is present on the posterior 

 maxilliped (absent in G. major) ; the cephalic spine is similar to 

 G. armiger (in G. caudani it resembles G. miles). The single 

 specimen of G. brevicornis is very nearly adult. The length is 

 greater than that of G. armiger (3.2 mm) and less than that of 

 G. major (5 mm. or more). 



Gaetanus unicornis n. sp. 



PI. 9, fig. 3; pi. 12, fig. .54; pi. 13, fig. 76. 



Female : A large Gaetanus in which the cephalic spine is very 

 long and straight, pointing slightly up instead of down (PL 9, 

 fig. 3). The anterior antennae are 24- jointed and as held in the 

 dead animal reach beyond the furca by at least the last four 

 joints. The second joint in the outer ramus of the posterior an- 

 tennae is without a process; the lamella on the first basal of the 

 posterior maxilliped is present, but does not have the rod-like 

 extension of G. brevicornis or G. miles (PI. 12, fig. 54). The 

 outer ramus of the first foot is distinctly 2-jointed, and the first 

 basal of the fourth foot (PI. 13, fig. 76) has tube-like bristles re- 

 sembling those in Gaidius. 



Length: Adult females, 6.5 mm. 



Coloration : Rather opaque and without pigment in formalin. 



Occurrence : Six females, Coll. 1045. Type in the collection 

 of the Universit}^ of California. 



Gaetanus clarus n. sp. 



PI. 9, fig. 5 ; pi. 14, fig. 90. 



Male : Head and spine resembling G. miles, but the spine is 

 longer and the front of the head below it protrudes considerably 

 (PI. 9, fig. 5). The anterior antennae are about as long as the 



