31 
Syringopora pennsylvanica n. sp. 
Plate VI, figures 1, 2, 3, 4 
Description . Corallum large, the corallites from 1 to 5 mm. apart. 
Corallites 2 to 3 mm. in diameter. Walls very thick. Funnels usually 
numerous, their walls thin, about one-third or one-sixth as thick as the 
thecal walls, and without spines or nodes. Septa absent, the inner walls 
of the theca forming a smooth line. 
Remarks . The absence of septa and nodes, the thin walls of the 
funnels, and the thick thecal walls distinguish this abundant form from S. 
surcularia . S. multattenuata McChesney, from the Pennsylvanian of the 
Mississippi valley and west, is at times so closely crowded as to have poly- 
gonal corallites, with the funnels most irregularly and angularly arranged. 
Locality and Horizon . In the Minnewanka region in the Pennsylvanian 
of sections 2-6 (C), 14 (c), 16 (?); 3a-3 (?); in the Mississippian of 4-2 (c). 
Phylum, ECHINODERMATA 
Class, blastoidea Say 
Genus, Metablastus Etheridge and Carpenter 
Metablastus bipyramidalis (Hall) 
1868. Pentremites bipyramidalis Hall, Geol. Iowa, vol. 1, pt. 2, p. 607, 
PI. 15, fig. 2; Metablastus bipyramidalis Keyes, 1894, Mo. Geol. 
Surv., vol. 4, p. 137, PI. 18, fig. 13. 
Remarks. Our specimens differ from this Mississippi Valley species 
apparently only in their more elongate basal plates. In the latter species 
these plates are about one-fifth the length of the entire calyx, in ours they 
are about one-third, but as the tip of our calyx has been destroyed the 
entire form would doubtless approach somewhat nearer Hall’s type. 
Locality and Horizon. In the Middle Mississippian of Missouri. In 
the Minnewanka region in the Lower Mississippian of section 2-23 (r). 
Phylum, MOLLUSCOIDEA 
Class, BRYOZOA 
Although Bryozoa do not form a prominent element in the various 
formations here discussed, they are present and collections of them were 
made. An unfortunate accident, however, completely removed all evidence 
of localities, and because of this they are not discussed. 
ClaSS, BRACHIOPODA 
Genus, Orbiculoidea d’Orbigny 
Orbiculoidea arenaria n. sp. 
Plate VI, figures 5, 6 
Description. Shell rather large for the genus, subcircular in outline. 
The dimensions of a pedicle and a brachial valve, respectively, are: 
greater diameter 21 mm. and 17 mm., lesser diameter 18 mm. and 15 mm. 
Height of brachial valve 3-5 mm. 
10277— 3J 
