41 



the pharynx and the oesophagus is covered at the dorsal side by a 

 large mass of glandular cells. The muscular fibres radiating from the 

 roof of the pharynx, and connecting this organ with the body wall, per- 

 forate the septa and unite with the longitudinal muscular layer of 

 the body- wall in the intersegmental region of the Vth, Vlth and Vllth 

 segment. 



The vascular system presents the usual structure and agrees 

 with that of some Acanthodrilus-species. There is a single dorsal 

 vessel and a supra-neural (ventral) vessel, only the infra-neural vessel 

 is absent. The tubular intestine, behind the gizzard, moreover is 

 furnished with a supra-intestinal vessel, and two infra-intestinal ves- 

 sels, communicating with the vascular plexus of the alimentary 

 canal; these intestinal vessels are connected by mesenteries with the 

 dorsal as well as with the ventral trunc. There are five pairs of 

 commissural vessels in segment VIII to XII, communicating through a 

 small branch with the dorsal as well as with the supra-intestinal vessel. 



N e p h r i d i a are present except in the anterior fourteen segments ; 

 they are rather long and consist of several loops of perforated cells. 



Genital organs. Two pairs of testes are situated at their usual 

 place in segment X and XI, attached to the posterior side of the 

 anterior septum; they lie free in the body-cavity, opposite to the 

 funnels of the sperm-ducts and do not seem to be enclosed in the se- 

 minal vesicles. Of these organs there are four pairs in segment IX, 

 X, XI and XII; the first pair of them depends on the anterior 

 septum of the segment X, the second and third pair from the poste- 

 rior septum of the same segment. The second pair of seminal vesicles 

 arises from the dorsal half of the 10th septum and is directed for- 

 ward; therefore this pair lies in the Xth segment. They are fused 

 together on the dorsal side. The third pair of seminal vesicles , arising 

 from the ventral half of the 10th septum, is directed backward, 

 and occupies the Xlth segment. The fourth pair of them , arising from 

 the posterior side of the 11th septum, is the largest and not only 

 fills out the total cavity of the Xllth segment, but also pushes far 

 backward its posterior septum. In consequence of the described situation, 

 the cells , thrown off by the testes in segment X , can get in the first 

 and third pair of the seminal vesicles , while the cells arising from the 

 testes in segment XI, can enter the second and fourth pair of them. 

 We do not know the forces by which the spermmothercells are di- 



