242 



J. Stephenson: Two Oligochsete Worms. [Vol. I. 



oil-like globules in its wall : it frequently has a somewhat 

 rhomboidal shape, owing to its being pulled out laterally by the 

 attachment of the septum. The intestine follows, also dilated at 

 the insertions of the septa ; its walls are of the same character as 

 those of the stomach. Ciliary motion may sometimes be detected 

 in the intestine, but it is not of a conspicuous character, nor 

 definiteh^ in a postero- anterior direction, as is commonly the case 

 in small aquatic OligochcCta. 



These animals are carnivorous ; on two occasions I found two 

 specimens on a dead fly in the water ; the stomach and intestine 

 of others showed Paramoecia and other Ciliata, small Crustacea, 

 Rotifers and Anguillulae in their interior. 



Circulatory system. — The dorsal vessel is contractile, the 

 contractions progressing from behind forwards ; it is attached to 

 the dorsal wall of the intestine, stomach, crop and oesophagus, 

 except at the angle between oesophagus and pharynx ; it is again 

 attached to the wall of the pharynx in its posterior part, and be- 

 comes free anteriorly before it divides. It is continued as two 

 lateral vessels at the sides of the buccal cavity, immediately pos- 

 terior to the nerve-commissures {v. text-fig. 4 C), which unite 



.«5 



r 



tv if^i\ i 



c 



Fig. 4 — A, anterior part of ventral nerve cord of C. pellvcidvs. in the extended 

 condition; P, cerelral ;iid 1 ureal f?rj)lia ai.d il.eir ron ini^Mires ; C, anterior end of 

 animal, from the side. (Reference letters as in Matts ix and x.) 



