

PLATE LIU. 



PAOB. 



Fig. 1. PHYLLOPOBINA TBENTONENSIS Nicholson 640 



1. Thin section cutting: the zoarium through the plane of expansion, x!8. 



1 a. Portion of same section showing the tubular zocecia just beneath their 



apertures, xlS. 

 1 b. Transverse section of a branch, x!8. 



1 c. Verti al section of the branch, x!8, showing basal plate, tubular zooecia 



and closely tabulated mesopores. 

 Trenton limestone, Belleville, Canada. 



Fig. 2. PHYLLOPOKINA BETICULATA Hall ._ 639 



2. Vertical section of branch, x25, showing basal plate, tabulated zocecia, and 



one of the tubular spines. 



2 a. Section, x25, cutting the zoarium through the plane of expansion. 



Trenton limestone, Trenton Falls, N. Y. 



Fig. a. PHYLLOPOHINA COBTICOSA Ulr 639 



3. Vertical section of branch, x!8, showing characters very much as in 1 c. 



only tne zooecial tubes have diaphragms. 



3 a. Section x!8, cutting the zoarium through the plane of expansion show- 



ing among other characters the strong mesial plate in the branch to 



the right. 



Trenton shales, Cannon Falls, Minn. 



Fig. 4. PHYLLOPOBINA ASPEBA Hall (39 



4. Section, x!8, showing structure of zoarium just below its celluliforous 



face. 



4 a. Portion of same section showing structure of the thick basal plate, x!8. 

 4 ft. Vertical section of a branch, x25. None of the zooocia are shown full 



length. 



4 c. Transverse section of two branches and dissepiment, x25, the latter 



apparently non-celluliferous. 

 Chazy limestone, Mingan, Canada. 



Fig. 5. PHYLLOPOKINA ASPEBATU-STBIATA Hall 639 



5 and a a. Two portions of a section,. x!8, passing through the plane of ex- 



pansion. The first shows structure of zoarium just above the basal 

 plate, while the second shows the structure just beneath the zocecia 

 apertures, where they are more or less completely isolated by the 

 closed mesopores. 



5 6. Vertical section of a branch, x!8, showing form of zooecia and the filled 

 mesopores. 

 Niagara group, Lockport, N. Y. 



