ON MONOPYLEPHORUS LIMOSUS. \) 



There are no septal glands in this species. 



Neoblasts, with compact cytoplasm and a large nncleolated 

 spherical nucleus, are attached here and there to the surface of 

 the posterior septa. 



The cœlomic corpuscles are round unicellular bodies, and are 

 especially abundant in the cœlom behind segment IV ; in life 

 (fig. 20) a distinct line can be seen at the intersegment III/IV, in 

 front of which these corpuscles are less numerous. They lie every- 

 where in the cœlom, floating free or attached to the peritoneal 

 layers of different organs. Each corpuscle measures 5-6 p in 

 diameter and apparently matches the peritoneal cells in volume ; it 

 is provided with a distinct cell- membrane and the homogeneous 

 cytoplasm contains a comparatively small number of spherical 

 granules which do not stain with eosin and measure 0.6-0.7 p. in 

 diameter ; the nucleus is comparatively small and compact and lies 

 in the centre. I A B c 



have no direct ob- xz\ 



servation on the /*:*••' < / .#->~^^- 



origin of these \*& «V • ^. *® w 



corpuscles, but in ^*0 

 mature individuals 



Fig. B. 

 they may increase Proliferating cœlomic corpuscles, x 300. 



in number by a peculiar form of division. The nucleus of a 

 corpuscle multiplies by repeated amitotic division, and the cell- 

 body grows to an extraordinary size (fig. 5, A). When the cell- 

 body has reached the maximum, membranes appear around each 

 nucleus and divide the whole into uninucleated corpuscles (fig. 5, 

 B, C). 



P. Mooee states concerning his Monopylephorus glaber that, 

 " among these corpuscles are seen a few filled with much smaller 

 granules which appear to be budded from the high peritoneal cells." 



