﻿1 8 Bulletin 18 44 



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Raphistoma obtusa Cleland 



Am. Pal., Vol. 3, Bull. 13, 1900, p. 13, pi. 15, figs. 7. 8, 9. 



This well marked species was found abundantly in the upper 

 portion of the Calciferous in the Ft. Hunter-Tribes Hill region 

 where the specimens are large. At Canajoharie the species is 

 much smaller and less abundant. 



Murchisonia mohawkensis Cleland 



Am. Pal., Bull. 13, p. 14, pi. 15, fig. 13. 



This species, which was very rare in the Ft. Hunter collection, 

 is one of the commoner fossils in other sections. At Clark's 

 quarry north of Tribes Hill, at the " Noses " near Yosts, and at 

 East Canada Creek it was found on weathered surfaces. 



Beilerophon calcifer Cleland 



Am. Pal., Vol. 3, Bull. 13, 1900, p. 14, pi. 15, figs. 15, 16, 17, 18. 



B. calcifer is a rare species, being found only at Ft. Hunter and 

 Canajoharie and rarely in these sections. 



LAMELLIBRANCHIA TA 



Edmondia (?) arcuata, sp. nov. PI. 4, Figs. 5, 6, 7. 



Shell of medium size, sub-rectangular in outline, length about 

 one-third greater than the height. Basal margin nearly straight 

 curving to the anterior and posterior extremities. Posterior mar- 

 gin curving abruptly below and more gently toward the cardinal 

 line. Cardinal margin (apparently) almost straight ; anterior 

 margin narrower than the posterior and curving less abruptly. 



Valves convex and gibbous in the umbonal region. Beaks at 

 about the anterior third, prominent and incurved. Umbonal 

 slope soon merging into the general convexity of the shell. 



The surface in one specimen is marked by concentric lines, but 

 the shell is not well enough preserved to warrant a definite state- 

 ment on this point. Two specimens measured 29 mm. in length 

 and 22 mm. in height. 



Distribution. — Three miles south of Ingham Mills in a creek 

 bed. The rock in which the specimens were 

 found was not in place but co'uld not have been 

 moved far, as was shown by the external con- 



