194 



ZOOLOGY 



water, which enters the pallial chamber by the ventral 

 siphon. 



The nephridia of Lamellibranchs are usually known as 

 the Organs of Bojanus. There is a single pair, and each con- 

 sists of a glandular or secretory portion which has an opening 



Fig. 117. ■ 



11 10 



-Diagrams of a Schematic Mollusc. After Lankester — Zoological Articles 

 reprinted from the EncydojocBdia BrUannica. 



into the pericardium, and of a ureter which opens to the exterior 

 in the neighbourhood of the orifice of the generative glands. In 

 the oyster the kidney is much less compact, and its secretory 

 part is scattered through the body, even reaching the mantle. 



