i88 



THE NEMERTINI 



in the mesoblastic jelly ("mesenchyme"). Although Salensky 

 terms this space " coelom," it is more probable that, if there is a 

 coelom at this stage, it is represented by the narrow cleft between 

 the somatic and splanchnic mesoblast, such as exists in some cases 



FIG. XXVII. 



Plan of the vascular and excretory systems (from Perrier, after Oudemans). 1, Carinella ; 

 2, Drepanophorus ; 3, 4, Eupolia; 5, Valenti.nia, (mid body), c, preoral anastomosis of lateral 

 vessel (the intraneural anastomosis is not represented in 1) ; d (in 4), supra-anal anastomosis, 

 (in 5) dorsal vessel ; b, parastomodseal sinus ; g, vessel of proboscis sheath ; fc, lateral vessel 

 of proboscis sheath ; I, lateral blood-vessel (in Fig. 3 the index line is carried to the dorsal 

 vessel, and in 5 to the proboscidial- vessel) ; TO, dorsal vessel ; n, nephridium ; p, p', p", ne- 

 phridial pore or pores ; s, preoral dilatation ; s', parastomodaeal sinus ; t, transverse vessels, 

 from dorsal to lateral vessels ; v, lateral vessel. 



according to Lebedinsky (26). The spaces run together to form 

 a large sinus, which becomes divided into a right and left channel 

 by the developing proboscis ; these channels become the lateral 

 vessels, and decrease in relative size. Probably this vascular 



