OBSERVATIONS ON POLYZOA. 



231 



EXPLANATION OF SIGNS USED IN THE PLATES. 



A 



Ccencecium. 



L' 



Brachial Contractors. 



A' 



CoencEcial Trunk. 



M 



Gastric Retractors. 



A" 



Coencecial Branches, lobes or 



M' 



CEsophageal Retractors. 





tubes. 



M" 



Bracial Retractors. 



A'" 



Coenoecial Cells. 



M+ 



Common trunk of the Re- 



A"" 



Coenoecial Oritice. 





tractors. 



B 



luvaginated Fold. 



M 



Lophophoric Flexor. 



C 



Polj'pide. 



N 



Anterior Retentors. 



c 



Dead Polypide. 



N' 



Posterior " 



D 



Ectocyst. 







Outer Tentacular Bands. 



E 



Endocyst. 



0' 



Inner " " 



E' 



First layer of the Endocyst. 



p 



Median muscle of the Epis- 



E" 



Second layer of the Endocyst. 





tonie. 



E'" 



Third " 



P' 



Lateral muscle of the Epis- 



E"" 



Fourth " " " 





tome. 



F 



Brachial Collar. 



Q 



Coencecial walls of Cristatella. 



E' 



Neural Partition or diaphragm 



R 



Parietal fibres (probably ab- 



G 



Calyx. 





normal). 



H 



Tentacles. 



s 



Nerve-mass. 



H' 



Tubular interior of the Ten- 



S' 



Lateral ganglions. 





tacles. 



T 



Lophophoric nerve-trunks. 



H" 



Cilia. 



T' 



Epistomic " " 



I 



Lophophore. 



T" 



Brachial " " 



I' 



Epistome. 



T'" 



Polypidal " " 



I" 



Mouth. 



"P'/'z 



CEsophageal " " 



J' 



First layer of the Alimentary 



T 



Gastric " " 





Canal. 



T+ 



Intestinal " " 



J" 



Second layer of the Aliment- 



U 



Lophophoric " branches. 





ary Canal. 



U' 



Tentacular " " 



J'" 



Third layer of the Alimentary 



V 



Funiculus. 





Canal. 



w 



Free Statoblasts. 



J"" 



Fourth layer of the Aliment- 



w 



Horny Casing, or brown 





ary Canal. 





sheath. 



J 



Hepatic Folds. 



W" 



Annular Sheath. 



K 



Oilsophagus. 



W" 



Spines. 



K' 



Stomach. 



W"" Gelatinous Envelope. 



K" 



Intestine. 



X 



Fixed Statoblasts. 



K'" 



CEsophageal Valve. 



Y 



Buds. 



K'" 



Intestinal " 



Y' 



Young Polypides. 



K 



Anus. 



z 



Clear spaces below the bases 



L 



Sphincter Muscle. 





of the Tentacles. 



