NEMERTEANS 195 



tance fully equal to that occupied by its branches, or about 0.35 mm. 

 The efferent nephridial duct passes directly outward from the posterior 

 end of the longitudinal canal and opens externally a little dorsally to 

 the lateral margin of body. 



Cephalic glands remarkably voluminous, reaching deep into tissues 

 of head fully three-fourths the distance from exterior to rhyncho- 

 daeum and extending posteriorly almost to the anterior end of the 

 brain region, where they cease abruptly and completely. 



Body Walls. The dark pigment which gives the deep color to 

 the body, and which is not soluble in alcohol, cedar oil or xylol, is 

 situated among the cutis glands in the outer longitudinal muscular 

 layer in small amount, but its chief position is in a conspicuous layer 

 just outside the circular muscles. In the head it is scattered through 

 the deeper muscles and connective tissues. It is especially abundant 

 between the cephalic furrows and the rhynchodaeum. 



In the anterior esophageal region the cutis glands reach inward 

 entirely through the outer longitudinal muscular layer, except in the 

 vicinity of the lateral margins. 



Frontal sense organs not developed as special sensory pits. 



Nervous system presents no marked peculiarities. Dorsal nerve is 

 fairly conspicuous immediately behind brain, but is very little developed 

 farther back. 



Reproductive Organs. From specimens collected in August, the 

 genital products had evidently been recently discharged. 



Habitat. Dredged in 30 f ms. off Point Fermin, near San Pedro, 

 Calif. But few specimens were found, and these inhabited strong, 

 parchment-like tubes among broken shells. Found also in 20 fms. in 

 Monterey Bay, Calif. (J. F. Abbott.) 



The species somewhat resembles the variety of Lineus bilineatus 

 figured by Burger in his Naples Monograph (pi. v, fig. 15) in regard 

 to the markings on the anterior portions of the body, but is much less 

 slender, and shows many anatomical differences. 



21. LINEUS WILSONI sp. nov. 



Pl. XVI, figs. IO, II. 



Body only moderately slender, rounded anteriorly, flattened in in- 

 testinal region, but with rounded lateral margins. Body is sometimes 

 wider in the intestinal region than the figure indicates. Head long 

 and slender, not marked off from body, but somewhat narrower just 

 back of brain; cephalic furrows correspondingly long. Intestinal 



