272 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



33. Micrura nigrirostris Coe, 1904 



M. nigrirostris Coe, 1905, 1905a. 



Habitat. Among kelp holdfasts and other growths on rocks at low- 

 water mark and below. 



Distribution. At present known only from southern California. 



34. Micrura olivaris Coe, 1905 



M. olivaris Coe, 1905a. 



Habitat. In crevices of rocks near low-water mark. 



Distribution. At present known definitely only from Monterey Bay, 

 California. A single specimen of the same or of a similar species was 

 dredged off San Francisco at a depth of 120 m. 



35. Micrura pardalis Coe, 1905 



(Plate 25, figs. 14-19) 



M. pardalis Coe, 1905a. 



Habitat. Among corallines and other growths on rocks and piers, and 

 especially in tide pools exposed to the full force of the surf. Also beneath 

 stones and in crevices of rocks near low-water mark. In some localities 

 this is one of the most common species of nemerteans. 



Distribution. At present known only from Monterey Bay, California, 

 and southward to Ensenada, Mexico. 



Reproduction. This species is hardy under aquarium conditions, some- 

 times living for several months in tubes of secreted mucus. After long 

 captivity most of the pigment disappears. Sexual products mature during 

 the spring and summer on the coast of southern California. The eggs 

 develop rapidly to the pilidium stage after artificial fertilization. 



Regeneration. In young individuals posterior regeneration and regu- 

 lation proceed rapidly at all levels posterior to brain but attempts to 

 obtain anterior regeneration of body fragments have not been successful. 



36. Micrura verrilli Coe, 1901 



Lineus striatus Griflin, 1898 (non Meckelia striata Diesing nee Borlasia 

 striata Rathke) ; M. verrilli Coe, 1904, 1905, 1905a. 

 Habitat. Beneath stones, in sandy mud and among roots of eel-grass 

 between tidemarks, among algae and other growths on rocks and in tide 

 pools, and especially among kelp holdfasts in shallow water. 



