10 



BULLETIN 81, UNITED STATES NATIONAL MUSEUM. 



Order FLOSCULARIACEA. 



Family FLOSCULARID^. 

 Genus Floscularia. 

 Octotrocha. 

 Limnias. 

 Ptygura. 

 Pseudoedstes. 

 Sinantherina. 



Family FLOSCULARID^ 



Genus Lacmularia. 



Beauchampia. 



Family CONOCHILID^. 



Genus Conochilus. 



Conochiloides. 



-Contd. 



Order COLLOTHECACEA. 



Family COLLOTHECID^. 

 Genus Collotheca. 



Stephanoceros . 



Family ATROCHIDE. 

 Genus Atrochus. 



Cupelopagis. 

 Acyclus. 



Order BDELLOIDA. 



Family ADINETID^. 

 Genus Adineta. 



Brady scela. 

 Family PHILODINAVID^. 



Genus Philodinavus . 

 Family PHILODINID^. 

 Subfamily PhilodiniNjE. 

 Genus Philodina. 

 Rotaria. 

 Macrotrachela. 

 Pleuretra. 



Family PHILODINID^— Continued. 

 Genus Dissotrocha. 



Embata. 



Abrochtha. 



Mniobia. 



Anomopus. 



Zelinhiella. 

 Subfamily Habrotrochin^. 

 Genus Habrotrocha. 



Scepanotrocha. 



Ceratotrocha. 



Family SEISONID^. 

 Genus Seison. 



Saccobdella. 



Order SEISONACEA. 



Family SEISONID^- 

 Genua Paraseison. 



-Continued. 



