300 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



70. Amphiporus formidabilis Griffin, 1898 



A. exilis Coe, 1901 ; A. for?nidabilis Coe, 1904, 1905, 1905a. 



Habitat. Lives beneath stones, in crevices of rocks, and among algae, 

 mussels, and other growths on rocks and spiles between tidemarks. Often 

 seen creeping over stones on foggy days. 



Distribution. At present known from Aleutian Islands, coasts of 

 Alaska and British Columbia, Puget Sound, and southward to Monterey 

 Bay, California. Common in many localities. 



71. Amphiporus fulvus Coe, 1905 



A. fulvus Coe, 1905a. 



Habitat. Among algae and other growths on rocks and spiles near 

 low-water mark and below to a depth of at least 85 m. 



Distribution. At present known only from San Pedro and San Diego, 

 California. 



72. Amphiporus gelatinosus Coe, 1905 



A. gelatinosus Coe, 1905a. 



The unfortunate loss of the proboscis at the time of collection and 

 failure to obtain additional specimens make it doubtful whether this spe- 

 cies belongs to the genus Amphiporus. 



Habitat and Distribution. The single known specimen was dredged 

 at a depth of about 300 m southwest of Kodiak Island, Alaska. 



73. Amphiporus imparispinosus Griffin, 1898 



A. leuciodus Coe, 1901; Punnett, 1901; A. imparispinosus Coe, 1904, 

 1905. 



Habitat. Common between tidemarks and below among algae, mus- 

 sels, and other growths on rocks and spiles ; often in situations exposed to 

 the full force of the surf ; also found beneath stones on rocky shores and 

 among shells on off-shore bottoms. 



Distribution. The writer has personally collected this species on the 

 coast of Siberia, Bering Sea, Alaska, British Columbia, Puget Sound, and 

 southward to Ensenada, Mexico. It has also been represented in almost 

 every collection sent for identification from these localities, so that it is 

 evidently the most populous species of nemertean of the North Pacific 

 coast. 



