! 



NO. 13 COE : REVISION OF THE NEMERTE AN FAUNA 275 



Habitat. In mud, sandy mud, or sand between tides in bays and 

 harbors and to depths of 50 m or more. 



Distribution. Previously known from Puget Sound to San Diego, 

 California; the most common species of nemertean in some localities. 

 Collected by the Allan Hancock Expeditions at San Gabriel Bay, Espiritu 

 Santo Island, Gulf of California, and at Mazatlan and Tenacatita, 

 Mexico. 



Reproduction. Sexually mature during May and June in southern 

 California and in July at Monterey Bay. Eggs develop readily as far as 

 pilidium stage after artificial fertilization. 



40. Cerebratulus corrugatus (Mcintosh), 1887 



C. magelhaensicus Burger, 1895; Lineus corrugatus Wheeler, 1934. 



This highly variable and widely distributed species has been reported 

 previously from the vicinity of South Georgia, Falkland and South Shet- 

 land islands, and on the South American coast as far north as Chile. It 

 was dredged at a depth of 20-40 m by the Allan Hancock Expedition of 

 1938 at San Nicolas Bay, and Independencia Bay, Peru, extending 

 the known range considerably northward. 



The generic status of the species is somewhat problematical because 

 of the great variability not only in form of body but also in structure of 

 body walls (Wheeler, 1934). The specimens in the Hancock collection 

 are obviously of the Cerebratulus type. 



41. Cerebratulus herculeus Coe, 1901 



C. herculeus Coe, 1904, 1905, 1905a; C. latus Coe, 1905. 



Habitat. Burrows in soft mud near low-water mark and below to 

 depths of 250 m or more. 



Distribution. Bering Sea, Alaska Peninsula, coast of Alaska, Puget 

 Sound, and southward to southern California in the off-shore waters. 



42. Cerebratulus lineolatus Coe, 1905 



C lineolatus Coe, 1905a. 



Habitat. In sandy mud near low-water mark and below. 



Distribution. Previously known only from San Pedro, Newport, and 

 San Diego harbors, California. Collected by the Allan Hancock Expedi- 

 tion of 1937 at a depth of 70 m at Puerto Refugio, Angel de la Guardia, 

 and at Willards Pt., Gonzaga Bay, Lower California, Mexico. 



