and a new Representative of it, 8. Claparcdii. 9 
peculiarities which Claparéde describes in the fect of some of its 
segments (the third, fourth, &c.) are wanting in our animal. 
Further, according to the statements of all authors, Sphero- 
dorum has four eyes, whilst our animal only shows two. The 
accordance of the true intestine has already been pointed out ; 
but we find essential differences in the anterior part of the ali- 
mentary tube, as in Spherodorum this consists of three succes- 
sive divisions (see Claparéde, Anat. &c., p.51), which cannot be 
made to agree with the structure of the cesophagus &c. described 
by us. 
teuly. as regards the external form of the body in general, 
this, again, is extremely different in the two animals. (irsted 
says of Spherodorum, “corpus lineare teretiusculum ;” John- 
ston, “body serpentiform;”’ and, lastly, Claparéde describes 
Spherodorum as a cylindrical worm of 2 inches long. If we 
contrast with this the little animal above described, scarcely 
2 millims. in length, and comparatively very broad and nearly 
oval, the difference becomes very striking. 
Nevertheless, notwithstanding all these differences, the affini- 
ties first indicated lead me to prefer uniting our animal, at least 
provisionally, with Spherodorum to form a single genus, for 
which purpose, however, the generic characters given by Girsted 
and others must undergo some modifications. I would define 
the genus as follows :— 
Genus SpHzroporem, (Crsted. 
The more or less elongated body, which is always narrowed 
before or behind, nowhere shows any transverse annulation 
or segmentation indicated by external furrows, although this is 
defined by the outer appendages. The buccal segment bears 
on the anterior margin of the small and not deeply divided 
cephalic lobes four clavate and anteriorly somewhat inflated 
frontal tentacles, the bases of and intervals between which are 
closely set with small but also clavate papillae. Further back, 
likewise on the buccal segments, there are two tentacular cirri, 
one on each side, which sometimes resemble the frontal tenta- 
cles, and in this case are to be regarded as true tentacles also in 
respect of their function, sometimes in form and signification 
approach the globular cutaneous appendages of the following 
segments, and must then pass as glandular organs. The first 
body-segment and all the following ones are characterized by 
large globular cutancous appendages occupied by tortuous 
tubular glands. Of these either each segment bears only two 
upon its back, namely, one on each side over the pedal tubercle 
(dorsal cirri), or the whole segment is surrounded by a circlet 
