SECRETING STRUCTURES. 2o 



each of the individuals of the compound mollusk, the Alpiduun 

 Ficus (Linnaeus), consists of nucleated cells, which contain in 

 their cavities a reddish brown fluid. 



The liver of Loligo sagittata (Lamark), contains a number of 

 nucleated cells, ovoidal and kidney shaped. These cells are dis- 

 tended with a brown bilious fluid. 



The nucleated cells in the liver of Aplysia punctata (Cuvier), 

 are full of a dark brown fluid. 



The ultimate vesicular caeca of the liver of Buccinum undatum, 

 contain ovoidal vesicles of various sizes. These vesicles contain 

 more or less numerous nucleated cells. The cells are full of a 

 dark brown fluid. 



The hepatic caeca in the liver of Patella vulgata. Each of 

 these vesicles encloses a body, w r hich consists of a number of 

 nucleated cells, full of a dark fluid resembling the bile. 



The simple biliary apparatus, which surrounds the gastric por- 

 tion of the intestinal tube of Nereis, contains nucleated cells, 

 full of a light brown fluid. 



The hepatic caeca of Carcinus Mcenas contains cells full of a 

 fluid of an ochrey colour, along with numerous oil globules. 



The hepatic caeca of Carabus catenulatus (Fabricius) contain 

 cells attached to their internal surfaces. Between the nuclei and 

 the cell walls, a brown liquid containing numerous granules is 

 situated. 



The kidney of Helix aspersa (Miiller) is principally composed 

 of numerous transparent vesicles. In the centre of each vesicle 

 is situated a cell full of a dead white granular mass. This gland 

 secretes pure uric acid. 



The ultimate elements of the human liver are nucleated cells. 

 Between the nucleus and the cell wall is a light brown fluid, 

 with one or two oil globules floating in it. 



The vesicular caeca, in the testicle of Squalus twrnubicu*, con- 

 tain nucleated cells which ultimately exhibit hi their interior 

 bundles of spermatozoa. 



The generative caeca of Edi'innis mlgaris (Lamark) contain 

 colls full of minute spermatozoa. 



jni<-tata secretes from the edge and internal surface of 



