26 



Art. 3. — T. Kal>uraki 



pharynx and the copulatoiy organs. The lungitiulinal trunk of 

 either side is also connected Avith the marginal nerve of the same- 

 sid-e by means of a very regular series of lateral nerves given ofï 

 usually from the main trunk at points opposite to the union of the 

 latter with transverse commissures. The marginal nerve, forming 

 a plexus, runs all round the body submarginally on the ventral 

 side. Between the transverse commissures and the lateral gut 

 diverticulae there exists no fixed relation in number, so far as my 

 observations go. The number of commissures is, of course, never 

 constant in the different individuals of the same species. In the 

 specimens, from which the figures were taken, the number of 

 commissures, exclusive of tliose bridging the space between the 

 anterior longitudinal trunks, is shown in the accompanying table. 



The dorsal longitudinal nerve trunl^s, briefly noted down in 

 the section concerning the brain, proceed towards the hind end 

 just underneath the sheet of dermal musculature. Each is con- 

 nected on the one hand with its fellow b}' a number of fine trans- 

 verse commissures and on the other with the marginal nerve of 

 the same side by means of lateral nerves given ofï from the trunk, 

 quite like the ventral nervous system. Besides, the connexion 

 between both the dorsal and the ventral nervous systems is effect- 

 ed l:)y means of vertical nerves running dorso-ventrally, as was 

 demonstrated in several species by Böhmig. 



The nerves show the somewhat reticulated appearance so 

 commonly described by various authors. Now I have little to add 

 to what has been written in detail by Bohmkt. Embedded in the- 

 nerves are numerous ganglionic cells at various points. 



