30 
Genus, Syringopora Goldfuss 
Remarks. The forms placed here under this genus do not show a 
uniform Beries of funnels, as can he seen in comparing transverse and 
longitudinal sections of the same specimen. A transverse section shows 
that the majority of the funnel edges have a concentric arrangement; 
at times some meet the thecal walls or each other. In longitudinal section 
these funnel edges appear like a series of cysts upon each side of a central 
canal. The constant presence of this central canal and the dominantly 
concentric arrangement of the funnel edges show that the vesicular material 
was deposited around a more or less central opening, in the form of inter- 
rupted truncate cones. 
In Syringopora, especially in those representatives with a small 
diameter, the crystalline aggregates of calcite or silica, with which the tubes 
are usually filled, make the determination of the internal characters most 
confusing. These crystals, growing more or less at right angles to the 
thecal or funnel walls, give lines running in the same direction as nodes or 
spines, i.e. from the walls towards the centre of the corallite. The two 
principal distinctions between these inorganic and organic formations 
are: (1) The crystal lines usually extend both without and within the fun- 
nel walls whereas true nodes or spines extend only inwards from the walls. 
(2) The colour of the walls is usually darker than that of the apparently 
purer crystalline aggregates. Even, however, with these points in mind, 
it is usually necessary to examine several corallines within a corallum in 
order to be reasonably certain of the internal characters. 
Syringopora surcvlaria Girty 
1899. Syringopora surcvlaria Girty, U.S. Geol. Surv., Mon. 32, pt. 2, 
p. 510, PI. 67, figs. 4a, b; Girty, 1903, U.S. Geol. Surv., Prof. 
Paper 16, p. 273. 
Remarks. The Minnewanka specimens appear to be identical with 
Girty’s species from the Madison limestone. 
Locality and Horizon. Lower Mississippian of Colorado, Wyoming, 
and Montana. In the Minnewanka region in the Mississippian of sections 
2-22 (c), 26 (R), 33 (c), 34 (c). 
Syringopora acvleata Girty 
1899. Syringopora aculeata Girty, U.S. Geol. Surv., Mon. 32, pt. 2, p. 509, 
PI. 67, figs. 5a, b; Girty, 1903, U.S. Geol. Surv., Prof. Paper 16, p. 273. 
Remarks . The form we have identified with Girty’s species resembles 
it in size, comparative thickness of thecal and funnel walls, number and 
elongation of funnels, and in the presence of thecal and funnel spines. 
It apparently differs only in its greater variability. Within an individual 
colony, both down in the Mississippian and up in the Pennsylvanian 
strata, occur corallites in which the thickness of the funnel walls varies 
from one-sixth of that of the thecal walls to equality with it. 
Locality and Horizon. In the Lower Mississippian of Colorado and 
the Yellowstone National park. In the Minnewanka region in the Lower 
Mississippian of section 2-34 (c); in the Pennsylvanian of section 2-8 (C). 
