112 
E. S. GOODRICH. 
many Polyclia3tes. These tubes had already been indistinctly 
seen and described by Hariner as “ elongated, pear-shaped 
bodies ” which “ vibrated individually.” 
The blind internal end of the nephridium of D. tEeniatus 
ends in a bundle of blind, slender tubular extensions, at the 
extremity of each of which is attached a long flagellum. The 
flagellum woi'ks down the tubule into the lumen of the nephri- 
dial canal, which is not otherwise ciliated. 
While able fully to confirm these important observations 
made by Shearer on the living worm, I am also in a position 
to complete his description from sections of well-preserved 
material. 
Fig. 1 is a slightly diagrammatic reconstruction, from 
sections, of the end of the nephridium. These structures are 
very small, and can only be made out with the highest 
powers. The nephridial canal is relatively thick-walled ; the 
cells of which it is composed are loaded with excretory 
globules and pierced by an intra-cellular lumen. Nuclei can 
be seen at r:u-e intervals along its course. One conspicuous 
large nucleus is always found at the extreme end, which pro- 
jects into a free space, supported by strands of mesenchyma- 
tous tissue. Here the nephridial lumen expands into a 
chamber bounded on one side by a thin wall from which 
arise the “ solenocyte ” tubes. They may be considered as 
hollow outgrowths of the wall. In sections they appear 
rather shorter and stouter than in the living worm ; this is 
probably due to contraction of the preserved material. Each 
tube bears a little lump of })rotoplasm at its free extremity, 
from which starts the flag’ellum. No nuclei are found on or 
neai‘ ihe tubes themselves. The whole apparatus thus con- 
sists of a single cell bearing some twenty or thirty tubes and 
flagella, all controlled by the one large nucleus mentioned 
above. 
It is clear that in Dinophilus we have a new type of soleno- 
cyte formation representing perhaps an intermediate step 
between the Platyhelminth “ flame-cell ” and the more 
typical Polychmte solenocyte, in which each tube, with its 
