COE : NEMERTEANS OF WEST AND NORTHWEST COASTS. 243 



four pouches of accessory stylets, while in the Alaska individuals 

 there are usually four (Text-lig. 48). Central stylet very long and 

 slender, of twice the length of the remarkably small basis (PI. 18, 

 fig. 118). There are either 14 or 16 proboscidial nerves (Text-fig. 

 10), half of which number enter the proboscis from each side at its 

 place of attachment. 



Cephalic glands moderately developed. Submuscular glands 

 occur in a limited area, near lateral margins of body in anterior 

 esophageal region. They are of large size, but are much scattered 

 and very few in number. 



Alimentary canal. — A rather extensive esophageal caecum ex- 

 tends l)eneath the stomach. It branches off from the esophagus 

 proper shortly behind the l)rain as a small canal which enlarges 

 posteriorly until it is as large as the stomach beneath which it lies. 

 It terminates blindly posteriorly somewhat behind the anterior ends 

 of the intestinal caeca, as is the case also with A. occidental! s. 

 The stomach extends posteriorly as a long, slender pylorus, which 

 does not open into intestine until far back of most anterior sexual 

 glands. 



Intestinal caeca extensive and much branched, extending forward 

 well towards the brain. 



Nephridia. — Situated in region of esophageal caecum, with a 

 single pair of efferent ducts. 



Cerebral sense organs situated beside brain and extending as large 

 lobes directly posterior to the dorsal brain lobes. 



Habitat. — Sitka, Alaska ; Victoria, B. C. ; Puget Sound (Coe, 

 :01). Collected by Mr. J. F. Abbott and by Prof. C. B. Wilson at 

 Pacific Grove, California. Found among crevices of rocks at low 

 tide. Not very common. The worms secrete an enormous amount 

 of mucous. 



55. Amphiporus tigrinus Coe. 



Proc. Wash. Acad. Sci., 3, p. 46, PI. 4, figs. 5-8 ; PI. 8, fig. 4 ; PI. 

 10, figs. 3, 4, 1901 ; Harriman Alaska Expedition, 11, p. 46, 



1904. 



PI. 25, fig. 201 ; Text-fig. 49. 

 Body moderately slender for genus, commonly 8 to 10 cm. iu 



