i 9n l Esterly : Copepoda of tht San Diego Region. 311 



the thorax (pi. 29, fig. 64). While the San Diego specimen does 

 nut agree in all respects with the description given by Sars i L903, 

 Pl>. 30 and 162), there is no apparent reason for making a sep- 

 arate species. The fifth feet are exactly as shown by Sars ( 1!)():5, 

 supp. pi. 6). Sars gives the length of the male as about 2 mm. 



Length : 3.10 mm. 



Coloration: In formalin, transparent and without pigment. 

 Occurrence: One male, station 1249, tow at, and vertical from, 325 f., 

 sounding 370 f., July 11, 190(1. 



According to v. Breemen (1908, p. 36), Gaidiits pungens and 

 G. borealis Wolfenden (1904. p. 11), are the same as G. tenuis- 

 pinus Sars. 



Genus Gaetanus Giesbrecht. 

 Gaetanus secundus n. sp. 



PI. 26, fig. 3; pi. 28, figs. 38, 43; pi. 30, figs. 73, s4. 



Adult female. The spine on the head is long, and directed 

 forward and slightly downward, and the rostrum is short and 

 rounded (pi. 28, fig. 4)5). The spines on the sides of the last 

 thoracic segment are long and extend beyond the middle of the 

 genital segment (pi. 28, fig. 38). 



The length of the cephalothorax from the tip of the cephalic 

 spine to the tip of the thoracic spine is over five times the length 

 of the abdomen, including the furca. The cephalothorax ami ab- 

 domen are each 4-segmented ; in the latter, the genital segment 

 is markedly convex on the ventral side and twice as long as the 

 second and third segments together, and twice as long as the anal 

 segment (pi. 28, fig. 38). 



The anterior antennae when removed from the body are 10.9 

 mm. long, thus being twice the length of the body. The pos- 

 terior antennae and mouth parts are of the usual forms ; the pos- 

 terior maxilliped has the lamella on the first basal (pi. 30, fig. 

 84). The swimming feet do not show any marked peculiarities 

 except that the first basal of the fourth pair has a row of heavy 

 spines (pi. 30, fig. 73). 



Immature male. The forms that I take to be the males of this 

 species resemble the adult females in every way except that they 



