OBöEltVA'l'lONS OX FKESU-WATEK PoLYZOA. l^'^ 



Explanation of Plates. 

 Plate XVII. 



t'ig. , 1. A «mall group of colonies', nat. size. 

 Fig. 2. A polypide. x 10. 

 Fig. S. vShape of the cœnœcial endocyst. 



Fig. :/. Diagrammatic representation of a [)olypide and a portion 

 of the cœnœcial endocyst. 



Tent. Tentacles. Epist. Epistome. 



N. Gang-. ISTervons g-ano^lion. 



Oesoph. Oesophagus. 



Tnvafif. tube. Invai^inable tiil^e. 



Over. Ovary. Stato. Statoblast. 



M. I. Muscles of the funiculus. 



M. II. Parieto-vaginal nuiscles. 



M. III. Retractor of the polypide. 



M. lY. Muscles of the gastric wall. 



M. V. Muscular layer of the endocyst. 



M. VI. ^luscular fibres of the epistome. 



Nephr. Nephridia. Loph. Lophophore. 



Tent, membr. Tentacular membrane. 

 Fig. 5. Statoblast. a. Front view. h. View in profile. 



Plate XVIII. 



Fig. 6'. Cells in the ectocyst. F x 2.* 

 Fig. 7. Section of the endocyst. F x 2. 

 Out. lay. Outer layer. 



* Zeiss' powers. 



