DINOPHILUS, POLYGOEDIUS, ECHIUEUS, AND PHOEONIS. Ill 
Notes on the Nephridia of Dinophilus and of the 
Larvae of Polygordius, Echiurus, and Phoronis. 
By 
E. Ciioodricli, F.K.S., 
Fellow of Mei'ton College, Oxford. 
With Plate 8. 
In this paper are recorded some observations made on four 
different types of true nephridia provided witli closed internal 
ends bearing some form of solenocyte. Although all these 
nephridia have been more or less completely described at 
some time or other by various authors^ I am able to add 
some details, not without interest, which help to complete our 
knowledge of these organs. 
Dinophilus. 
The nephridia of this hee-swimming Annelid have been 
described by Schmidt, Korschelt (7), Meyer (9), Mariner (5), 
Schimkewitsch (11), and Shearer (14). It is stated by 
Korschelt that in D. apatris, and by Meyer that in D. 
gyrocil iatus, the internal extremity is blind, and ends in a 
flame cell. In Manner’s excellent account of D. taeniatus 
the end is said to lie in a cavity near the gut, and to bear a 
ciliated appendage or knob forming the base of attachment 
for the flame-like bunch of cilia which beat down the lumen 
of the canal. Marmer is not positive as to the absence of an 
opening. 
In 1906 Shearer made the interesting discovery that the 
“ ciliated appendage ” of Marmer is really formed of a number 
of solenocyte tubes, comparable to those I have described in 
