THE 
AMERICAN GEOLOGISl 
Vol. XXV. MAY, igoo. No. 5 
DESCRIPTIONS OF NEW SPECIES OF FOSSILS 
FROM THE DEVONIAN AND SUBCARBONI- 
FEROUS ROCKS OF MISSOURI. 
By R. R. Rowley, Louisiana, Mo. 
(Plate V.) 
Rhipidomella diminutiva (nov. sp.). 
Plate V, Fig. 41. View of the brachial vah-e, natural size. 
Fig. 42. Cardinal view of the same specimen. 
Fig. 43. Pedicel valve of the same. 
Shell suborbicLilar, length and width'about equal. Car- 
dinal line about half the greatest width of the shell. Cardi- 
nal extremities rounded. Brachial valve less convex than 
the pedicel. Cardinal area triangular, small. Surface mark- 
ed b)' even, rounded stria;. The specimen figured is medi- 
um in size and crossed by two or three lines of growth. 
This fossil might be mistaken for the young of O. swallovi, 
but the occurrence of so man}- of the same size and charac- 
ters, together with the adult appearance of the shells, have 
led the author to describe this form as a new species. 
The collection contains a dozen specimens, found in tiie 
white, lini)- cherts of the Lower Burlington limestone at Lou- 
isiana, Mo. 
Spirifer schucherti (nov. sp.). 
Plate V, Figs. 15, 16, 17. Dorsal, ventral, and cardinal views of the 
same specimen, natural size. 
Fig. 59. Enlargement of surface to show granular cliaracter. 
