252 Dr. M. Djbowski on Dosilia Stepanowli. 



amphidiscl are always surrounded by a whole group of tlie 

 shorter ones. The h\rger (longer) amphidisci are irregularly 

 scattered among the shorter ones. 



The Intermediate Structure 



consists of" round non-nucleate cells of very different sizes, 

 which, without losing their rounded (spherical) form, lie quite 

 close together, and completely fill up the spaces between the 

 amphidisci. The diameter of the cells varies between 0'002 

 and 0*004 millim. The larger cells are irregularly scattered 

 among the smaller ones, by which the structure acquires a 

 very peculiar aspect. The intermediate structure, like the 

 shorter amphidisci, is covered by the outer membrane. 



The Outer Membrane (Oberhiiutchen) 



is a structureless chitinized membrane 0"002 millim. thick, 

 which constitutes the outer covering of the whole coating- 

 layer, and passes over the shorter amphidisci enclosed in the 

 latter. 



If we briefly sum up what has been said upon the coating- 

 layer, it appears that it is formed of two kinds of amphidisci, 

 both the shorter and the longer of Avhich stand close together 

 and are imbedded in a cellular substance, which is covered 

 externally by a thin membrane, so that only the longer amphi- 

 disci protrude from the latter. 



The coating-layer forms an umbiliciform depression from 

 which the pore-tube projects. 



3. The Pore 



shows two different parts: — 1. The pore-tule] and 2. The 

 2)ore-aj)pendage. 



A cylindrical tube, O'OSO millim. long and 0-028 millim. 

 wide, the walls of which diminish in thickness from below 

 upwards, originates directly from the capsule. This tube is 

 the pore- tube, which has the upjjer pore-opening at its upper 

 somewhat narrowed end, and at the base a septum, which 

 is somewhat convex downwards (inwards). The septum 

 originates directly from the wall of the pore- tube, and cuts 

 off the lumen of the tube from that of the genimule itself. 



4. The Poee-appendage (" cirrous apfenJages " of 

 Carter). 



At the upper end of the pore-tube and about 0*020 millim. 

 below its upper opening, there springs from the wall of the 

 pore a quadrangular, thin, pale yellowish horn-coloured 



