266 FRANK E. BEDDARD. 
bodies of the Vertebrata ; their appearance, at least, is very like 
that of the structures mentioned. These same characters are 
found in a few other genera of Eudrilide ; they occur in Teleu- 
drilus, in Hyperiodrilus, and Heliodrilus (which two 
latter Michaelsen unites into a single genus), and finally in 
Polytoreutus. I am ina position to state that the integu- 
mental sense-organs—if I am justified in applying the term 
“‘sense-organs”’ to them—are absent in the following genera:— 
Eudriloides, Heliodrilus, Pareudrilus, Nemertodrilus, 
and Stuhlmannia. In none of these genera are there cal- 
ciferous glands at all like those of the genera mentioned in 
the first list. Libyodrilus, Pareudrilus, Alvania, and 
Nemertodrilus have no calciferous glands at all—not a trace 
of them. In the remaining forms the calciferous glands have 
undergone the peculiar modification that has been described on 
a previous page. I think that these two characters serve to 
distinguish two groups of Eudrilide better than the paired 
or unpaired generative apertures. I would furthermore remark 
that the condition of the glands, which I believe to be the 
representatives of the calciferous glands of other Eudrilide— 
in the genus Eudriloides, for example—is not in accord 
with the low position among the “ Teleudrilini” to which 
Michaelsen assigns it. 
These genera are the only ones in which both the points 
used for the subdivision of the family are known; in some 
others the presence or absence of calciferous glands has been 
noted. Thus both Michaelsen and Rosa have shown the ex- 
istence of a single pair of calciferous glands in the 12th seg- 
ment in the genus Paradrilus. Preussia is said to have a 
pair of these glands in the 12th segment; but Michaelsen is 
doubtful about their nature, and has stated that they contained 
no calcareous particles. Platydrilus, Megacheta, and 
Metadrilus have, according to Michaelsen, no calciferous 
glands, and the remaining genera are not described in this 
respect. It will be noticed that in the two groups into which 
I have provisionally divided the family there is yet another 
character which divided them, and which may possibly be of 
