8 Dr. R. Greeff on the Annelid Genus Sphserodoruui, 



lutions before reaching the anus, ^vhich 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 discoid 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 Si^haro- 

 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 papillse. 

 Further points of union are presented by the form and compo- 

 sition of the feet, which in both consist of simple conical tins 

 having a bundle of composite setse. CErstcd"^ indeed ascribes 

 to SjjhcErodormn a multiHd tin {pinna unica multrjida) ; but this 

 notion, as Claparede correctly observes, has evidently arisen 

 from the fact that CErsted 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 Spharodorum, we find, in the first place, that whilst 

 Spharodorum bears only one pair of the large globular cutaneous 

 appendages upon the back of each segment, in our animal ten 

 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 Spharodorum 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 buccal 

 segment both agree ; but we have described two posterior 

 tentacles or tentacular cirri, exactly like the frontal tentacles, 

 which are wanting in Spharodorvm, 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 

 arie absent in SpJtarodorum -, whilst, on the other hand, the 

 * hoc. cit. p. 108. 



