232 



CTENIS. 



lateral anastomoses with the genus Ctenis, and the lower surface 

 of the segments was found to he covered with small circular 

 projections regarded by Schenk as sporangia. The preservation 

 of the specimen did not permit of any microscopical examination of 



FIG. 42. Ctenis, sp. (Nat. size.) From a specimen in the Manchester 

 Museum (No. 53). 



[I am indebted to the Literary and Philosophical Society of Manchester for the 

 use of the blocks from which Figs. 42 and 43 have been printed.] 



the epidermal cells or ' sporangia.' Additional evidence healing 

 on the systematic position of Ctenis has been furnished in recent 



