OBSERVATIONS ON POLYZOA. 



231 



EXPLANATION OF SIGNS USED IN THE PLATES. 



A Coenoecium. 



A' Ccenoecial Trunk. 



A" Ccenoecial Branches, lobes or 

 tubes. 



A'" Ccenoecial Cells. 



A"" Coenoecial Orifice. 



B Invaginated Fold. 



C Polypide. 



C' Dead Polypide. 



D Ectocyst. 



E Endocyst. 



E' First layer of the Endocyst. 



E" Second layer of the Eudocyst. 



E'" Third " 



E"" Fourth " " " 



F Brachial Collar. 



F' Neural Partition or diaphragm 



G Calyx. 



H Tentacles. 



H' Tubular interior of the Ten- 

 tacles. 



H" Cilia. 



I Lophophore. 



I' Epistome. 



I" Mouth. 



J' First layer of the Alimentary 

 Canal. 



J" Second layer of the Aliment- 

 ary Canal. 



J"' Third layer of the Alimentary. 

 Canal. 



J"" Fourth layer of the Aliment- 

 ary Canal. 



J Hepatic Folds. 



K (Esophagus. 



K' Stomach. 



K" Intestine. 



K'" (Esophageal Valve. 



K"" Intestinal " 



K Anus. 



L Sphincter Muscle. 



Brachial Contractors. 

 Gastric Retractors. 

 GEsophageal Retractors. 

 Bracial Retractors. 

 Common trunk of the' Re- 

 tractors. 



M Lophophoric Flexor. 



N Anterior Retentors. 



N' Posterior " 



O Outer Tentacular Bands. 



0' Inner " " 



P Median muscle of the Epis- 

 tome. 



P' Lateral muscle of the Epis- 

 tome. 



Q Coeuoecial walls of Cristatella. 



R Parietal fibres (probably ab- 

 normal). 



S Nerve-mass. 



S' Lateral ganglions. 



T Lophophoric nerve-trunks. 



T' Epistomic 



T" Brachial 



T'" Polypidal 



T"-'' CEsophageal 



T Gastric 



T* Intestinal 



U Lophophoric branches. 



U' Tentacular 



V Funiculus. 



W Free Statoblasts. 



W' Horny Casing, or brown 

 sheath. 



W" Annular Sheath. 



W'" Spines. 



W"" Gelatinous Envelope. 



X Fixed Statoblasts. 



Y Buds. 



Y' Young Polypides. 



2 Clear spaces below the bases 

 of the Tentacles. 



