wo.1653. PACIFIC COAST C0PEP0D8 WILSON. 4i;,", 



of smaller diameter than the processes, and about half their Length. 

 There are no traces of anal Lamina?. 



The first antennae arc short and indistinctly jointed; they curve in 

 toward each other and are devoid of setae except at their very tips. 

 The second pair are Large and >tout with broad and bluntly rounded 

 tips. They curve in toward each other much more than the t i 1 ■ — i 

 pair, being so closely approximated to the anterior margin of the 

 carapace as to form a half circle with their tip- in actual contact. 

 Each bears on its ventral surface near the end a short accessory 

 branch much narrower than the main antenna and terminating in 

 two small spine-. 



The mouth tube is broadly ovate, its uarrowed tip projecting 

 slightly beyond the anterior margin of the carapace, its base well 

 rounded and constricted into a short neck where it joins the carapace. 

 The mouth opening is at the very tip. hut ventral rather than ter- 

 minal: the lip- flare out into a short funnel surrounded by a fringe 

 of hair-. The mandibles are short and stout and furnished with 

 powerful muscles; they are toothed only on the inner margin, hut 

 the teeth are Large and curved at their tips Like talons. 



The maxillae are two-thirds as Long as the mouth tube; each is 

 biramose, the endopod much shorter than the exopod and curved 

 over inward. Both rami are again bipartite, the two branches of 

 the same length and ending in short and straight spines. The first 

 maxillipeds are large and powerful: they are so Large and stand in 

 -iirh a relation to the head as to appear like the lower jaw of a 

 vertebrate in side view. Each consists of a swollen basal joint 

 armed on its inner margin with two roughened areas, a small one at 

 the extreme base and a much Larger one toward the distal end: he 

 tween these is a short -pine. The terminal joint is slender and 

 lipped with two claws, the inner one much smaller than the outer. 



The ovaries are paired and occupy nearly the whole id' the fused 

 genital portion of the body; the external ovisacs are cylindrical, one 

 third the diameter of the genital portion and one-fourth Longer than 

 the Longest posterior processes. The eggs are small and arranged in 

 ten or twelve rows. 



Total Length, including the posterior processes, L2to L5mm. Length 

 of second maxillipeds, L.8 mm. : of head and neck, 3.6 mm.; of genital 

 portion, -">.7 mm.: of egg cases, t.25 nun. Width of genital portion, 

 2.6 mm. 



Color. — (preserved material) a uniform yellowish white. Lighter 

 and more transparent in the second maxillipeds, deepening into dark 

 yellow in the genital portion: egg strings orange. 

 Proc. N. M. vol. \.\xv — US 3U 



