no. 2354. NEW SPECIES OF PARASITIC OOPEPO&S— WILSON. 15 



PSEUDOMOLGUS, species. 



Host and record of specimens. — A single badly mutilated speci- 

 men of an adult Pseudomolgus female with egg strings was obtained 

 from a Tectibranch mollusk at Laguna Beach, California, August 8, 

 1918, has been given Cat. No. 5356G, U.S.N.M. In all probability 

 this represents a new species of the genus, but owing to the condition 

 of the specimen it does not seem advisable to attempt establishing the 

 species. 



It is included here to show that the Tectibranchs of the California 

 coast are infested as well as those of the Hawaiian Islands, and search 

 would probably reveal copepods enough to establish this species and 

 perhaps others. 



MODIOLICOLA JAMAICENCIS, new species. 



Plate 7, figs. 58-65. 



Host and record of specimens. — Five females, three of which car- 

 ried egg strings, were obtained from black ascidians common upon 

 the mangrove roots on the JBogue Islands, Montego Bay, Jamaica. 

 A single specimen has been selected as the type female and has been 

 given Cat. No. 53567, U.S.N.M. The others become paratypes with 

 Cat. No. 53568, U.S.N.M. 



Specific characters of female. — Body elliptical, strongly narrowed 

 anteriorly and posteriorly, nearly as wide as long. Cephalon not 

 very distinctly separated from the first thorax segment; the latter 

 the widest part of the body. Second, third, and fourth segments 

 diminishing rapidly in width; fifth segment abruptly narrowed to 

 half the width of the fourth. Genital segment considerably wider 

 and longer than the fifth segment ; the openings of the oviducts near 

 its posterior margin and widely separated. Abdomen four-jointed, 

 the joints diminishing slightly in size from in front backward. 

 Anal laminae as wide as long, each armed with five plumose setae; 

 numbering the setse from within outward their lengths come in 

 the following order, beginning with the longest, 2, 3, 1, 4, 5. 



The first antennae are seven-jointed, the second joint the longest, 

 and all the joints heavily armed with setae; those of the second, 

 fourth, and seventh joints are especially long and numerous. The 

 second antennae are three jointed, the three joints about the same 

 length. The third or terminal joint is tipped with two stout curved 

 claws, with two setae on the outer and two on the inner margin. 

 The basal and second joint each carry a short seta on their inner 

 margin. The masticatory lappet of the maxillae is elongate and 

 densely hairy, and its base is armed with two setae. The maxilliped 

 is without any armature except a minute spine on the inner margin 



