SECRETING STRUCTURES. 415 



apparatus, and iu the loop of the intestine of Fha/hma 

 vulgaris (Forbes and Goodsir), consists of a number of vesicles, 

 and each vesicle contains a mass of nucleated cells. These 

 cells contain a dark-brown bilious fluid. 



The hepatic organ in the neighbourhood of the stomach, 

 in each of the individuals of the compound mollusc, the 

 Alpidium ficus (Linnajus), 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-shapecL These cells 

 are distended with a brown bilious fluid. 



The nucleated cells in the liver of Aplyda jmnetata 

 (Cuvier) are full of a dark-brown fluid. 



The ultimate vesicular ca-ca of the liver of BiLcdnum 

 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 ca^ca in the liver of Patella vulrjata. — Each of 

 these vesicles encloses a body, which consists of a number of 

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



The simple biliary apparatus which surrounds the gastric 

 portion of the intestinal tube of Nereis contains nucleated 

 cells, full of a light-brown fluid. 



The hepatic ca;ca of Carcinus mmnas contains cells full of 

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



The hepatic ca^ca of Carahis catcnulatus (Fabricius) contain 

 cells attached to their internal surfaces. Between the nuclei 

 and the cell-walls a brown li(|uid containing numerous 

 granules is situated. 



The kidney of Helix aspersa (M tiller) is principally com- 

 posed of numerous transparent vesicles. In the centre of 

 each vesicle is situated a cell full of a dead white tn-anular 

 mass. This gland secretes pure uric acid. 



The ultimate elements of the human liver are nucleated 



