ri:m.\kk.\i'.t.i: spectes of rx'TiirnoTDS. HO 



The Ovary. — As already stated, all the six specimens ex- 

 amined by me \\gyc females. In all the cases, the ovary was 

 develo2:)ed as a long narrow band, lying over the posterior parts 

 of the ventral vessel for an extent of about one-sixth of its total 

 length. Structurally the organ offers no new points Avorth 

 specially mentioning. 



On the same ground I may altogether dispense with giving 

 an account of the nervous-system. 



Floating Bodies in the Coelom. — Besides the cœlomic cor- 

 puscles already referred to (fig. 39, b.c.), the cœlomic fluid further 

 contains two kinds of peculiar floating bodies that require to be 

 described. One of them shall here be called the corj^uscular 

 bodies ; the other is the so-called " Töpfchen." 



The corpuscular bodies are of very various sizes. The larger 

 ones measure 1-2 mm. across and are easily seen with the naked 

 eye. Spherical in shape, they are of a dark reddish or of a 

 dark violet color in the fresh state. Examined under the micro- 

 scope, they are found to be hollow blastula-like spheres, the wall 

 of which consists of an epithelium-like aggregation of remarkable 

 looking cells disposed in a layer. Seen on the surface, the cells 

 present an irregularly lobed appearance, tightly clasping one 

 another with the lobes (fig. 21 a). A distinct boundary mem- 

 brane exists between them. The finely granular cytoplasm incloses 

 a number of refractive granules or spherules of a deep brownish- 

 violet color. The nucleus is spherical, shows a relatively thick 

 nuclear membrane and is but little affected l)y ordinary nuclear 

 stains. 



The physiology of the above described bodies remains com- 

 pletely in the dark. As to their origin, a clue might be found 



