no.1653. PACIFIC COAST COPEPODS WILSON. 4;}, r ) 



First antennae swollen and two-jointed, terminal joint much smaller 

 than thf basal, as wide as long and armed with a few minute spines. 

 Second antennae in the form of large sickle-shaped hook-, their bases 

 enlarged into hemispherical knobs and articulated directly with the 

 ventral surface of the head. Month and month parts ai the extreme 

 posterior border of the head; mouth opening a transverse slit par- 

 tially covered by the upper lip, which is ribbon-shaped, much wider 

 than long, and has a straight posterior margin. 



Maxilla' and niaxilliped- visible at the sides of the month opening, 



mandibles concealed beneath the upper lip. Mandibles of the usual 

 shape, a flattened and curved lamina, twice as long as wide, pointed 

 at the tip. and armed along either margin \\ ith a row of large bluntly 

 pointed teeth, about 30 on the convex margin and -2'> on the concave. 



Maxillae two-jointed, the basal joint swollen and cylindrical and at- 

 tached ju-t at the posterior margin of the upper lip: the terminal 

 joint an elongate pointed lamina, with six or seven large rounded 

 teeth on it- posterior margin near the tip. Maxillipeds also two- 

 jointed, the basal j<»int swollen ami attached close to the maxillae, the 

 terminal joint -mailer and divided at the tip into a dorsal and 

 ventral knob. The former is covered with small spine-, the latter 

 carries a single large conical spine. 



Total length, L0.5 nun. Length of head. L.5 mm. Width at pos- 

 terior margin, l.."> nun. Length of first two thorax joint-. L.75 mm.: 



of genital portion. ".•_'."> mm. With of latter. 2.75 mm. Length of 

 egg strings, 1 1.5 mm. 



Color. This is of n muddy gray, somewhat mottled on the dorsal 

 surface, lighter beneath. Egg strings a sulphur yellow. 



Male. — Head joined with the first thorax segment and swollen 

 into an ovoid ma-- much larger than the rest of the body. Free 

 thorax distinctly segmented and curved over ventrally; genital seg 

 i nen t slightly enlarged and evenly rounded; no abdomen; two narrow 

 conical anal laminae attached directly to the genital segment, each 

 tipped w ith two minute spine-. 



First antennae in the form of -mall finger-like projections jusl over 

 the bases of the second pair. Other month parts similar to those of 

 the female. Two pair- of rudimentary leg- on the first two thorax 

 joints, each consisting of a short cylindrical basal joint tipped with 

 two conical -pine-. 



Total length. L.6 mm. Length of carapace. 0.88 mm. Width of 

 same, 0.G mm. 



Color, a clear yellow, much lighter than the female : ton ml attached 



to the abdomen id' the latter between the posterior processes of the 

 genital portion. 



{epachthes, inaxBrfs^ troublesome, annoying.) 



All the specimens are excellently preserved and each of the females 

 carries a pair of fully developed egg -t rings. 



