8 Dr. R. Greeff on the Annelid Genus Spherodorum, 
lutions before reaching the anus, which is situated at the poste- 
rior extremity of the body. 
With regard to the sexual conditions, I can only state that 
one of the animals examined I found filled pretty closely with 
roundish disccid ova, which lay perfectly loosely and irregularly 
in the body-cavity, and, surrounding the intestine on all sides, 
were driven to and fro in the cavity of the body by the move- 
ments of the intestine and the general movements of the animal. 
If we now glance back at the zoological characters of our 
animal, especially in comparison with those of the genus Sphero- 
dorum, we shall be at once struck by certain points common to 
both. The most prominent of these are the globular cutaneous 
appendages occupied by glands, and the form of the cephalic 
segment, with its peculiarly formed tentacles and _papille. 
Further points of union are presented by the form and compo- 
sition of the feet, which in both consist of simple conical fins 
having a bundle of composite sete. (£rsted* indeed ascribes 
to Spherodorum a multifid fin (pinna unica multéfida); but this 
notion, as Claparéde correctly observes, has evidently arisen 
from the fact that Cirsted regarded the glandular appendages 
which are frequently seated upon the pedal tubercles as parts or 
branches of the fin. Besides these characters, the two have in 
common the absence of any external segmentation of the body, 
or annulation of it by means of transverse furrows, as also, in 
connexion with this, no internal constrictions of the intestine 
are present, but the latter in both constitutes a loose tube laid 
together in several convolutions, 
When we consider those properties of our animal which re- 
move it from Spherodorum, we find, in the first place, that whilst 
Spherodorum bears only one pair of the large globular cutaneous 
appendages upon the back of each segment, in our animal fen 
of these stand upon each segment—six on the back, and four on 
the ventral surface. There is also a difference in the form of 
these appendages; for in Spherodorum there is a papilliform 
process upon the globular capsule, whilst in our animal, in 
which this process’ is deficient, the globular form of the struc- 
tures in question is much more clearly shown. In the presence 
and even the form of the four frontal tentacles of the buceal 
segment both agree; but we have described two posterior 
tentacles or tentacular cirri, exactly like the frontal tentacles, 
which are wanting in Spherodorum, where their place is taken 
by two mere;rudimentary glandular appendages. 
Of subordinate distinctions we find that in our animal there 
are at the apices of the pedal tubercles two lamellar fins, which 
are absent in Spherodorum; whilst, on the other hand, the 
* Loc. cit. p. 108, 
