no.1653. PACIFIC COAST COPEPODB WILSON. i;;; 



-pint's, the centra] pari is a square projection having n shorl and 

 stoul spine :it each of its distal corners. The maxillae are stout and 

 compact, conical in shape, and each terminating in ;i stoul spine; 

 each carries a shorl ramus or palp on its ventral surface near the 

 center, also tipped with a stout spine; there is a third spine <>n the 

 outer margin near the base, but this comes directly from the maxilla 

 without any ramus. 



The first maxillipeds have a stout basal joint which is armed with 

 a large spine on it- inner margin near the base of the terminal joint. 

 The latter is slender and is terminated by :i small curved claw and two 

 minute spines. 



Total length, 1.7 nun. Length of head, 1.45 mm.; of genital por- 

 tion. :'> mm.; of egg :ases, 3.42 nun. Width of head, 0.75 nun.: of 

 bases of second maxillipeds, 2 nun.: of genital portion, 1.9 nun.: of 

 egg cases, I mm. 



Color, t )f preserved material ;i uniform lighl orange, darker over 

 the ovaries in the genital portion. 



(bicaulieulata, furnished with two -inn- or stalks, in allusion to 

 the double stem of the attachment bulla.) 



This species may he recognized by these two -tern- of the attach- 

 ment bulla, by the fact that the egg cases are attached at Ui<- extreme 

 ventral corners in side view and as widely separated a- possible in 

 dorsal view, when really the openings of the oviducts are consider- 

 ably farther forward and inward; by tin- narrowness of the base of 

 the head and the anterior part of the genital portion and the contrast- 

 ing width of the bases oi the second maxillipeds, and by the fact that 



the parasite- are found attached to the tip- of the irill filaments and 



not to the arches or sides of the gill cavity. 



LERNJEOPODA FALCULATA. new species. 



Plate i..\\.\ 1 1 1. 



Host "ml i-< , md of 8p< ' 'nit us. — A lot of four female- was obtained 

 from the gills of the blue-back salmon, Oncorhynchus u< rka, at Baker 

 Lake. Washington, in L902, by the (J. s. Bureau of Fisheries. These 



are made the types id' the new species and are Cat. No. 38586, 



[J.S.N.M. 

 A single female was obtained at Bristol Bay, Alaska, for which no 



date or host wa- given; it is Cat. No. ^:'> (it. I ".S.N..M. 



Three lots were obtained by the I'. S. Bureau of Fisheries from 

 trout, one containing two female- taken from the inside of the oper- 

 culum at Hot Creek. Ca— el. California, Cat. No. 38589, I.S.N.M.: 

 another containing two females taken from the gills, in the west fork 

 of Feather River, California. Cat. No. 38588, IT.S.N.M., and the 

 third containing a single female taken from the ventral tin. in the 

 north fork of Feather River, Cat. No. 38590, U.S.N.M. 



