108 KOTIFERA. 



and arrangement; for the determination of British 

 species I have depended on my own researches, as 

 the Class has been the subject of my special study 

 for some years. 



KOTIFERA. 



Animals with articulations more or less distinct, 

 with a skin sometimes leathery, but often forming 

 a transparent shell ; with a single jointed foot 

 behind; and in some cases other jointed mem- 

 bers ; with vibrating cilia forming whirlpools 

 for locomotion, on the front; with a mouth con- 

 taining complex jaws, often seated within the 

 thorax; with distinct sexes, generally differing 

 greatly from each other ; producing shelled eggs. 



The marine species are so few that I need not 

 divide them into Orders and Families. 



1. Skin flexible. 



Furcularia (Lamk.). Body lengthened, com- 

 pressed, terminating behind in a short tail-like 

 foot armed with two long, diverging, pointed toes ; 

 one eye in the front. 



F. marina. Fig. 183 ; mag. 1 f . 



Synchceta (Ehr.). Body three-sided, very broad 

 before, tapering behind to a very minute two-toed 

 foot ; front set with one or more pairs of bristles ; 

 a pendent ear-like lobe on each side, well ciliated ; 

 one large eye in the midst of the head. 



S. Baltica. Fig. 184 ; mag. * J-. 



