NEMERTEANS 



125 



The total number of species already recorded from the region 

 covered by this report is surprisingly large, considering the few 

 attempts at their collection. And it should be remarked that 

 we find in this region not only a large number of species, but 

 also a surprising abundance of individuals of the species repre- 

 sented. It now seems probable that this coast will eventually 

 be found to possess more species of Nemerteans than any other 

 region of equal size on the globe. And certainly I know of no 

 locality where so large a proportion of the invertebrate animals 

 found in a miscellaneous collection belong to the Nemerteans 

 as on the northwest coast of North America. 



KEY TO THE PACIFIC COAST NEMERTEANS DESCRIBED ON THE FOL- 



LOWING PAGES 



This key is arranged for use in connection with the one published 

 in the former portion of this report (pp. 7-11), and is likewise based 

 mainly on superficial and easily distinguishable characters. 



Order Paleonemertea. 1 



Body remarkably long, soft, fragile. Head distinctly marked off 

 from body, usually broader than neck, often flattened dorso-ven- 

 trally .............................................................. Carinella. 



1. Body large, rather firm, only moderately slender, attaining a 



length of 50 cm. or more, pale yellowish or rosy, sometimes 

 with greenish tinge ; with three longitudinal velvety, blackish 

 lines and a series of narrow rings of similar color. 



C. frenata, p. 129. 



2. Body firm, rather stout, upwards of 30 cm. long, deep red with 



a series of narrow white rings ............ C. albocincta, p. 136. 



3. Body slender, subcylindrical, 15 cm. or more in length, deep 



brown, with a series of white rings and four longitudinal white 

 lines, of which two are lateral, while the other two divide dor- 

 sal surface of body into three equal parts... C. cingulata^. 138. 



Order Eoplonemertea. 



I. Body very slender, almost filiform, somewhat flattened ; with four 

 large ocelli ; with central stylet and two pouches of accessory 

 stylets. Proboscis sheath about one-third as long as body. 



Nemertopsis . 



1 As stated above, Burger's orders Protonemertea and Mesonemertea are here 

 united into the older order Paleonemertea Hubrecht. 



