198 bulletin: museum of comparative zoology. 



light chocolate brown in intestinal region ; ventral surface brownish 

 flesh colored or light chocolate, with a median ventral stripe of 

 ocher. 



Cephalic glands well developed ; brain remarkably voluminous ; 

 nephridia situated in middle third of esophageal region, with a 

 single efferent duct on each side ; sexual products mature in July. 



Habitat. — An active species found abundantly in muddy locali- 

 ties beneath stones at half tide and below ; southern Alaska to 

 Prince William Sound (Coe, :01). Collected also by Mr. Shearer at 

 Vancouver Island, B. C, and by the Albatross in Bellingham Bay, 

 Washington, in green mud at a depth of 11 fms. 



The present known range of the species is, therefore, from the 

 State of Washington to Prince William Sound, Alaska. 



8(1. Uerebratulus albifrons Coe. 



Proc. Wash. Acad. Sci., 3, p. 82, PI. 4, figs. 3, 4, 1901; Ilarriman 

 Alaska Expedition, 11, pp. 82, 200 ; PI. 18, fig. 9, 1904. 



Body long and ribbon-like, much flattened and Avith thin margins 

 in intestinal region, rounded anteriorly, much as in (J. marginatus\ 

 cephalic furrows long and deep ; ocelli wanting. 



Length 15-30 cm. or more ; width 3—6 mm. 



Color of body ranges from dark l»rown with a tinge of pur{)le, to 

 brownish purple, slaty or black ; often with a more reddish median 

 band, due to position of proboscis sheath. Thin lateral margins of 

 intestinal region often paler in color. Anterior portions of head 

 pure white, both above and below, for about three fourths the dis- 

 tance to posterior ends of cephalic furrows; sometimes white bor- 

 der continues quite to ends of furrows, and reaches anterior end of 

 mouth, but this is not usually the case. Proboscis pinkish when 

 extended. Margins of mouth grayish. 



Habitat. — The type specimen was found under a stone at low 

 water, Sitka, Alaska (Coe, :01). The species occurs sparingly in 

 mud, San Pedro, California ; off San Pedro in 2-20 fms.; between 

 San Pedro and Santa Catalina Island in 50 fms. (Coe, :04). Also 

 dredged by the Albatross in 53 fms., fine gray sand and mud, off the 

 coast of southern California (Sta. 2902,^34° 06' N. Lat., 120° 02^ 

 W. Long). Another specimen was taken by the Albatross in fine 



