Review of Geinitz on the rocks and fossils of Nebraska. 185 
lent figures and description of this species in his Monograph of 
the British Carboniferous Brachiopoda, or Prof. McCoy’s de- 
scription in his British Paleozoic fossils, to be convinced that the 
two shells are totally distinct. Indeed they probably belong to 
distinct subgenera or genera, as the S. Keniuckensis seems to be 
punctate like Spiriferina, 
He is probably right in making Prof. Swallow’s so-called Or- 
thisina Missouriana a synonym of Plicatula striato-costata Cox, 
which I had done some years since. Dr. White and Mr. St.John, 
however, have ascertained that it posesses some very extraordi- 
nary intermal characters, showing it to be typical of a new genus. 
Although this shell closely resembles Mr. Davidson’s East In- 
dian Streptorhynchus pectinifera, with which Prof. Geinitz thinks 
t identical, they must be specifically distinct, if Mr. Davidson’s 
sure represents the striae correctly as running parallel to the 
plications to the front margin, instead of converging toward th 
top of the plications near the front. 
Af Prof. Geinitz is correct in identifying the shell he refers, 
without figure or description, to Productus horrescens with P. 
Rogersii, it is the same described by Dr. Owen under the name 
P. 1 ebrascensis. Dr, Owen’s figure gives a very incorrect idea 
mens, labelled by himself, from his brother, Prof. Richard Owen, 
and found it to be the common Coal-measure shell generally 
Wn in the west as P. Rogersii. Out of thousands of speci- 
mens of this species, showing the hinge and interior of both 
hal area and hinge-teeth of Strophalosia. In short it 1s a true 
Productus closely allied to P. scabriculus. 
Prod cora, P. semireticulatus, P. costatus, P. punctatus, &c., 
“entioned but not figured by Prof. Geinitz, are doubtless the 
pe Coal-measure forms usually so gree in se: a 
ng i i rboniferous. Tha - 
Sing in part up into the Permo-cai a pa 
Dr. Norwood a 
sea anus (as indicated by Prof. Geinitz), which is also 
Closely allied ra e ten sbi though it is ery 4 
not the P. Caihounianus Swallow, nor P. Flemingit, as Prot. @ 
tai The other shell he figures under the name P. Homes 
ioe de Verneuil, looks exceedingly unlike the figures of “9 
— Wpe of that species, being more probably only a larger individ- 
_ Nal of the same he figures as P. te 
Au. Joun. Scr.—Seconp SzniEs, VoL. XLIV, No. 131.—Serr., 1867. 
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