ko.1653. PACIFIC COAST C0PEP0D8— WILSON. 461 



Genus PHR IXOCEPH ALUS, new. 



Diagnosis. — Female entirely destitute of segmentation, but with 

 the different body regions fairly distinct. Head enlarged and club- 

 shaped, with three pairs of horns, two pairs Lateral, branched, and 

 chitinous, one pair ventral, softer and nearly simple. Head passing 

 insensibly into an elongate neck furnished with two pairs of lateral 

 horns and one pair of ventral ones, the latter opposite the posterior 

 pair of lateral ones. Neck bent at a righl angle where it joins the 

 genital segment ; the latter straight, cylindrical, and enlarged to sev- 

 eral limes the diameter <>l' the neck. No posterior Lobes or procej 

 Abdomen very small and rudimentary, without anal lamina' or setae. 

 Egg tubes long, each coiled into a tight spiral nearly as long a- the 

 entire body; eggs uniseriate. Month terminal, with three pairs of 

 rudimentary month parts. Two pairs of uniramose, three-jointed 

 tegs attached close to the mouth. 



Typ< -Spi rns.--rhri.rnr, /thill us r'nirin hilt lis. 



{phriosocephaliis, $pi£6s, bristling and K£<f>a\r}, head.) 



PHRIXOCEPHALUS CINCINNATUS, new species. 

 Plate LXXYT. flg. 101. 



Host and record of specimens. — Two females found attached to the 

 eyes of a species of Githarichthys, one of the -oft flounders, at Mon- 

 terey Bay, California, by the steamer Albatross in L904. These are 

 made the types of the new genus and species and are Cat. No. 38599, 

 l.S.N.M. Both specimens carry egg strings. 



Female. Head enlarged and club-shaped, with a pair of short 

 branched horns on either side and a pair of softer and stouter one-. 

 nearly simple, on the ventral surface at the frontal margin. The 

 antei ior pair of lateral horns is branched from the very base, the two 

 branches forming an obtuse angle with each other, the inner one ex 

 tending forward and inward parallel with the anterior margin of 



the head, while the outer one extend- at right angles to the central 



axis of the body ami parallel to the posterior horn. These latter are 

 branched only at their tips and the rami are short and knob-like. 

 The head passes i n-eii-i 1 >ly into a narrow neck which tapers hack 

 ward, its narrowest portion being just at its junction with the genital 

 segment, where it i- bent at right angles to the latter. It i- also 

 twisted a quarter of the way around, so that when the creature i- 

 lying on the side of it- genital segment the head and neck present 



either their dor-al or ventral Surfaces. In both of the female- studied 



the twisting was sinistral, so that the Left side of the genital segment 

 appeared in connection with the ventral surface of the neck and head. 



