IO8 EISEN 



worm in order to facilitate the absorption of the chylus. On this ac- 

 count a good view of these cells can only be had in longitudinal sec- 

 tions. In transverse sections only part of each cell is cut and exposed, 

 and the nature of the structure cannot be made out. 



Penial bulb. The penial bulb of Fridericia is quite characteristic 

 and seems to be of similar structure in all the species investigated by 

 the author. There is only one kind of cells filling the bulb. These 

 cells all open in the extension of the sperm-duct and along the surface 

 of the bulb ; the duct connects with the bulb at the base of the latter 

 and cannot strictly be said to enter the bulb. The bulb in this species 

 is the simplest of any in this group with distinct bulb. 



Nephridia. In all species described here the nephridia are charac- 

 terized by a large anteseptal, which in size approaches the postseptal 

 part. In not a single instance does the anteseptal consist of only the 

 nephrostome, as, for instance, in the genus Lumbricillus . 



SYNOPSIS OF SPECIES OF FRIDERICIA DESCRIBED IN THIS PAPER. 



I. Spermathecae without diverticles. 



Brain posteriorly truncate or slightly convex, deltoid. Spermathecal stalk 

 more than twice as long as the ampulla. Peptonephridia with only two 

 branches. Sperm-funnels short, almost globular. Chylus cells in XI, XII 

 and XIII. Duct of chylus cells with a spur pointing forward. Duct lined 

 by a membrane. Very large anteseptal i. F. harrimani sp. nov. 



Brain posteriorly slightly emarginated. Spermathecal stalk about twice as 

 long as the ampulla which connects with the intestine. Peptonephridia large, 

 conical, with numerous short branches. Chylus cells in X, XI and XII. 

 Duct of chylus with sigmoid, indistinct spur and without a membrane except 

 at its upper end. Anteseptal large 2. F.johnsoni&p. nov. 



Brain almost circular, posteriorly convex. Spermathecal duct less then twice 

 as long as the ampulla which is connected with the intestine Peptonephridia 

 with many branches starting from a common base-palmate. Chylus cells in 

 XIV, XV and XVI. The duct is digitate at the lower end, without distinct 

 lining membrane except at the top. Nephridia with long and narrow ante- 

 septal 3. F. fuchsi sp. nov. 



Brain ovoid, posteriorly convex. Spermathecal duct about four times as long 

 as the ampulla which is not connected with the intestine. Chylus cells in 

 XIV, XV and XVI, cells very broad and shallow. Chylus duct sigmoid and 

 much twisted, with a distinct membrane all along its course. Large ante- 

 septal 4. F. sonorce sp. nov. 



II. Spermathecae with two diverticles. 



Brain circular, posteriorly convex. Diverticles of spermatheca pendent. 

 Chylus cells in XIV, XV and XVI ; duct branched, without distinct lining 

 membrane. Nephridial anteseptal thin and comparatively short. 



5. F. santcerosce sp. nov. 



Brain longer than broad, posteriorly convex. Spermathecal diverticles not 

 pendent. Nephridial anteseptal globular and strongly granulated ; unusu- 

 ally thick canal 6. F. santcebarbarce sp. nov. 



Brain longer than broad, posteriorly convex. Spermathecal diverticles nar- 

 row, short, and pendent. Nephridial anteseptal large, deltoid, with few 

 coarse granules 7- F. popofiana sp. nov. 



