and a new Bepresentaiive of it, S. Clapavedii. 9 



peculiarities whicli Claparede describes in tlie feet of some of its 

 segments (the tliird, fourth, &c.) are wanting in our animal. 

 Further, according to the statements of all authors, Spharo- 

 ihriim 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 SpJiarodorum this consists of three succes- 

 sive divisions (see Claparede, Anat. &c., p. 51), which cannot be 

 made to agree with the structure of the cesophagus &c. described 

 by us. 



Lastly, as regards the external form of the body in general, 

 this, again, is extremely different in the two animals. (J^rsted 

 says oi Spliarodoriim, "corpus linearc teretiusculum ;" John- 

 ston, "body serpentiform;^^ and, lastly, Claparede describes 

 Spluerodorum as a cylindrical worm of 3 inches long. If we 

 contrast with this the little animal above described, scarcely 

 3 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 Spharodorum. to form a single genus, for 

 which purpose, however, the generic characters given byCErsted 

 and others must undergo some modifications. I would define 

 the genus as follows : — 



Genus Spil^rodorum, OErsted. 



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 papillie. 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 cutaneous 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 



