CENTROPYGUS JOSEENSIS 



255 



CoELOMic System and its Modifications. 



The lateral lacunae (lateral blood-vessels of authors before 

 Oka (1912)) extend throughout the body, being much reduced 

 at either end ; in each somite there are regularly arranged 

 communications dorsally between the lateral lacunae and 

 ventrally with the ventral lacuna (Text-fig. 9, L.I.). There 

 is no dorsal lacuna and this is absent also in other Herpo- 

 bdellids, and the ventral lacuna is small and contains only the 



Text-fig. 10. 



Transverse section of a ciliated funnel of C. joseensis, showing 

 the ciliated crown cells and the granular cells. C'.c, ciliated crown 

 cell. G.C., granular cells. A., ampulla. 



nerve-cord and ganglia and forms no expansion anteriorly to 

 contain the reproductive organs. 



Sense Organs. 



These consist of a series of flask-shaped organs chiefly 

 arranged along the edge of the oral sucker. They have been 

 described and figured by Kennel (1886), and I have nothing 

 to add to his description. 



I wish to thank Professor J. P. Hill, of University College, 

 London, for his kindly assistance whilst engaged in this work 

 in his department. 



