45 
Schizophoria chouteauemis Weller 
1914. Schizophoria chouteauensis Weller, State Geol. Surv., 111., Mon. 1, 
p. 163, PI. 23, figs. 6-19. 
Remarks. The Minnewanka specimens observed are, judging from 
surface features, apparently identical with the form named by Weller S . 
chouteauensis. In size our specimens agree more fully with White and 
Whitfield’s S . suhelliptica, but in this species the beaks of both valves pro- 
ject posteriorly more strongly, there is a broad median sinus in the pedicle 
valve, and near the frontal margin the surface of the shell has four or five 
radiating striae in 1 mm. Even in size, however, the difference between 
the Minnewanka specimens and Weller’s species is slight; two specimens of S . 
chouteauensis noted give for greatest width 14 mm. and 23 mm., respectively. 
Locality and Horizon. Lower Mississippian (Chouteau) of Missouri. 
In the Minnewanka region in the Lower Mississippian of section 2-35 (r). 
Genus, Enteletes Fischer de Waldheim 
cf. Enteletes hemiplicata Hall 
Remarks. A single crushed specimen, further imperfect in having lost 
the umbonal region, shows the four prominent subangular plications upon 
each valve characteristic of this species. At the cardinal margin there 
occurs similarly a faint plication, and the entire shell is covered by fine 
but conspicuous radial striae. The plications strongly zigzag at the margin. 
Owing to the crushed state of the shell it is impossible to say how convex it 
was originally; it was, however, apparently not quite as globular as the 
common Indiana form. Our specimen, moreover, has the two middle 
plications of the pedicle valve much more widely separated and lacks the 
single low median plication of the brachial valve. 
Locality and Horizon. Pennsylvanian of Mississippi valley and the 
Rocky mountains. In the Minnewanka region in the Lower Mississippian 
of section 2-34 (R). 
Genus, Rhynchotreta Hall 
Rhynchotreta sp. 
Remarks. A single shell, imperfect anteriorly, belongs apparently to 
this genus. The narrow umbo of the brachial valve meets the pedicle valve 
at nearly a right angle. The brachial valve bears a deep, angular median 
sinus and eight, low, rounded plications. 
Locality and Horizon. In the Minnewanka region in the Lower Penn- 
sylvanian of section 2-10 (R). 
Genua, Camarotoechia Hall and Clarke 
Camarotoechia sp. 
Remarks. A single, somewhat imperfect shell looks much like C. 
endlichi Meek except that it has a rounded instead of an acutely angular 
margin of the pedicle valve. The median sinus of the pedicle valve is 
broad and flat. The entire surface of each valve is covered with about 
45 low rounded plications with narrow interspaces. The sinus has six 
plications at bottom and five upon each inp£r slope. 
Locality and Horizon. In the Minnewanka region in the Upper Dev- 
onian of section 2-38 (R). 
10277-4 
