NO. 13 coe: revision of the nemertean fauna 309 



94. Drepanophorus crassus (Quatr.), 1846 



D. crassus Burger, 1893; Paradrepanophorus crassus (?) Wijnhoff, 

 1926. 



Habitat. Dredged in off-shore waters at depths up to 100 m or more. 



Distribution. This species has been reported from European waters, 

 from near the shores of tropical Pacific islands as well as from the west 

 coasts of Mexico and Panama. Collected by the Allan Hancock Expedi- 

 tions in the Gulf of California and at Independencia Bay, Peru. 



95. Drepanophorus ritteri Coe, 1905 



D. ritteri Coe, 1905a. 



Habitat and Distribution. At present known only from depths of 

 50 to 300 m off the coast of southern California. 



Tribe 2. Pelagica 



Two species of bathypelagic nemerteans have been collected from far 

 beneath the surface of the ocean off the Pacific coast. These are members 

 of separate families. 



Key to Families 



1. Body broad and very flat; intestinal diverticula with ventral 



branch; male without tentacles Planktonemertidae 



1. Body slender, with thin lateral margins; intestinal diverticula 



without ventral branch ; male with tentacles . . Nectonemertidae 



Family Planktonemertidae 

 Genus PLANKTONEMERTES Woodworth 



96. Planktonemertes agassizli Woodworth, 1899 



P. agassizii Coe, 1905, 1926. 



Habitat and Distribution. A bathypelagic species, the individuals of 

 which float freely or swim slowly at depths of nearly 1,000 m or more in 

 the ocean off the coasts of Panama and Ecuador. 



