CHAPTER XXI. 



NEMERTINI. 



PHYLUM RHYNCHOCOELA, MAX SCHULTZE. 



CLASS. NEMERTINI (von Siebold and Stannius). 



BRANCH A. DIMYARIA. 



Order 1. Protonemertini. 

 Fam. 1. Carinellidae. 

 2. Hubrechtiidae. 



Order 2. Mesonemertini. 

 Fam. Cephalothricidae. 



Order 3. Metanemertini. 



Fam. 1. Eunemertidae. 



2. Ototyphlonemertidae. 



3. Prosorhocmidae. 



4. Amphiporidae. 



5. Tetrastemmatidae. 



6. Nectonemertidae. 



7. Pelagonemertidae. 



8. Malacobdellidae. 



* BRANCH B. TRIMYARIA. 



Order 4. Heteronemertini. 

 Fam. 1. Eupoliidae. 

 2. Lineidae. 



THE Nemertine worms constitute a compact group of animals 

 distinguished alike from the lower Platyhelmia and from the more 

 highly organised class of Chaetopoda by certain definite structural 

 peculiarities. 



Historical Survey. The first account and figure of a Nemertine worm 

 is given by Borlase in 1758. The early zoologists, such as 0. F. Miiller, 

 Johnston, Bosc, considered them as Turbellarians, and included them in 



