ON THE REVISION OF THE MOLLUSK GENUS PTERINEA 
GOLDFUSS. i 
By Henry SHaAuer WILLIAMS. 
‘Of Cornell University, Ithaca, New York. 
In the course of preparing descriptions of the fossils of the Chap- 
man sandstone of Maine (from specimens belonging to the U. S. 
National Museum in Washington), it has been found necessary to 
revise the generic limits of the genus Pterinea as originally defined 
by Goldfuss.¢ 
In the generic diagnosis (both the Latin and German forms of it) 
Goldfuss made no mention of the surface sculpture. In the present 
state of taxonomy, however, the presence or absence of radial surface 
sculpture appears to be of more than specific significance. 
It is therefore proposed to restrict the genus Pterinea to that sec- 
tion of the original genus which includes the first species, Pterinea 
lwvis, as type, the surface of which is normally marked only by con- 
centric lines of growth; and to erect new generic groups for the other 
species of Goldfuss’s genus. 
The following fourteen species were placed under the generic name 
Pterinea by Goldfuss: 
1. Pterinea levis, the type of Pterinea Goldfuss, sensu stricto. 
2. P. ventricosa, the type of Micropteria Frech. 
3. P. bicarinata, Grammysia bicarinata Goldfuss species. 
4, P. plana, a species of Tolmaza, new genus. 
. P. elongata, a species of Tolmaza, new genus. 
. P. lineata, the type of Tolmaia, new genus. 
. P. radiata=? an Aviculopectinoid shell. 
. P. carinata, Byssopteria carinata. 
. P. elegans, a species of Cypricardinia. 
10. P. lamellosa, a species of Actinopterella, new genus. 
CH CO NI Sd Cr 
@Goldfuss, Petrefacta Germania, 2d ed., 18638, Pt. 2, pp. 126-129, pls. cx1x, 
OSOX 
PROCEEDINGS U.S. NATIONAL Museum, VoL. XXXIV—No. 1600. 
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