AN OLIGOCH^TE WORM. 



309 



ccelomic cavity and the free ends moving about with the flow of 

 the coelomic iiuid. Tlie pressure of the cover-slip on the worm 

 is all that is necessary to obtain these corpuscles, which are forced 

 out through the head-pore to relieve the pressure. The head-pore 

 is situated between the prostomium and the 1st segment in the 

 dorsal median line. Very often, also, the ccelomic contents are 



Text-fig. 63. 



A. Ccfilomic covptiscles of Encliytrceus pellucidus. 



B. Corpuscle just dividing into two. 



n., nucleus ; tJi. of a., threads of iittachment to the coelomic wall. 



forced out through a pore near the anus. The presence of 

 this pore near the anus is not so generally known as that of the 

 head-pore, but it is certainly there, although rather difficult to 

 see. Goodrich (7) has never seen any cases of multiplication 

 by division of these corpuscles, but I have often observed these 

 corpuscles in various stages of division (text-fig. 63 B). 



(6) The second type of coelomic corpuscle (text-fig. 64) is 



Text-fig. 64. 



r-ef. bod. 



coil, th 



Three stages in the disintegration of a coelomic corpuscle 

 of ISnchytrcBus pellucidus. 



Ref.bod., refringent body; coil.th., coiled thread; «., nucleus. 



smaller and not uniformly granular, but certainly seems, as 

 Goodrich suggests, to be a variety of the first kind of corpuscle. 

 In it there is a colourless and vei-y refringent body, whilst the 

 rest of the corpuscle is granular. The curious fact is that when 



