272 



HARDWICKE'S SCIENCE-GOSSIP. 



toes, the short brain and the apparent absence of an 

 eye, are sufficient characters to show how very 

 distinct this species is. 



The lorica is so delicate that I have failed to define 

 the respective outlines of the dorsal and ventral 

 plates, or the depth of the sulcus. The internal 



Fig. 155.— Distyla agilis: a, dorsal view, extended; n, lateral view, extended; c, ventral view, retracted. X 540 diam. 



Fig. 156. — Monostyla bifurca : A, dorsal \ iew ; B, lateral view ; c, ventral view, retracted. X 650 diam. 



The head and the anterior part of the trunk are 

 neatly parallel-sided, but behind the trunk swells to 

 a graceful oval, terminated by the oblong shield-plate. 



organs are generally normal, but the mastax seems 

 broader and more powerful than usual. As in 

 Distyla dep-esm, there appear to be two small and 



