LEUCOPSACrS ORTTTODOCrP. 41 



membrane is usually not membranously develojted but is represented 

 bv fine, irre2;ularlv l)rancliin2; and anastomosins;, cobweb-like 

 tbrends spread over tlie raeshwork formed by the paratangentials 

 of the dermalia. The "pores" or the gnps inclosed by the 

 threads are accordingly not rounded and ]^ore-like, but quite 

 irregular in shape and size. The dermal memln-ane is therefore 

 in no way distinguishable from the more deeply situated trabeculre, 

 with which it is in fact directly continuous. 



In the subdermal space, which is nowhere of any great 

 extent, trabecuhc are present in moderate abundance. The nuclei, 

 found here and there in the little stained granular substance of 

 the trabeculpe, measure not more than 2 /'- in diameter. They 

 are moderately strongly colored without showing chromatic con- 

 tents with any distinctness. 



Archiçocytes occur in abundance as usual, especially on and 

 close to the outside of the flagellated chambers, either solitarily 

 or grouped together in exceedingly variable number. They are 

 2-3? JJ- large. A strongly stained and externally well defined 

 cytoplasm is to be ascribed to the cells, though always sparsely 

 present. The nucleus is of about the same size as the trabecular 

 nucleus, but o-enerallv incloses a somewhat refractive chromatic 

 mass ; it is about as well stained as the cytoplasm, though ap- 

 pearing clearer at a certain focus of the microscope. 



In Sp. Xo. 230, but not in the other specimen, I have found 

 a number of large, ovum-like cells (dia. 20-40«), apparently 

 freely occuring in the trabecular spaces. A description of these 

 peculiar cells has already been given by me in my Contribution 

 I. ('oi), p. 182, and need not be repeated. A figure of one is 

 now given in PI. III., fig. 21. As to their real nature and 

 import, I am still in the dark. 



