36 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Orthis pectinella = Dinorthis pectinella (Emmons) 
O. tricenaria = Hesperorthis tricenaria (Conrad) 
*Plectambonittes sericea = Sowerbyella sp. 
Rafinesquina alternata = Rafinesquina trentonensis (Conrad) 
These fossils suggest correlation with some part of the Rockland formation. 
On the west bank of the Hudson (Gordon, r1gr1, p. 83) near Highland, dur- 
ing construction of the railroad, graptolites were found in the shales that cover 
a large portion of the west side of the Hudson in the Poughkeepsie Quadrangle. 
These graptolites contain Nemagraptus and belong to the lower Normanskill 
assemblage. 
VICINITY OF NORTH CAMBRIDGE, N. Y. 
A collection from three-quarters to a mile north of North Cambridge, N. Y., 
is of special interest. The rock is a coarsely granular, dark-gray limestone con- 
taining a few brachiopods, Pleurothis ? sp., Bimuria ? sp., Onychoplecia, 
Sphenotreta, and Ptychoglyptus sp. The specimens were taken from an area 
mapped as the Georgia slate. The collection has been variously identified from 
Ordovician to Silurian, the latter an obvious error. 
The Pleurorthis is a questionable reference for some of the specimens because 
they are plicate with the plicae overlain by costellae. No other orthid quite like 
it is known to the writer. The Bimuria ? is similar to the small Bimurias from 
the Pratt Ferry and Rich Valley formations and resembles B. ? matutina Cooper. 
The Onychoplecia is a large one and is most like O. gracilis (Raymond) from 
the Chazy group. The Ptychoglyptus is similar to P. ? kindlei. This compari- 
son at once suggests Table Head or Mystic conglomerate as the probable rela- 
tionship of these brachiopods. Doubt may be cast on this suggestion, however, 
because Sphenotreta, a Marmor and Porterfield genus, has not yet been taken 
in the Quebec or Newfoundland formations. It is possible, too, that these fossils 
actually belong to a part of the Chazy group hitherto undiscovered. Possibly 
they are related to the Youngman formation of Vermont which might be expected 
to have these genera. 
Nothing is now known of the field relationships of the rocks from which this 
collection was taken. Possibly they came from boulders and are related to the 
Mystic and the Table Head, but more probably they belong in some part of the 
Chazy group or the early Porterfield stage Youngman formation. 
4. THE APPALACHIANS (PENNSYLVANIA TO ALABAMA) 
Many parts of the Appalachian Valley have been mapped in detail, and excel- 
lent maps have been published showing the extent of the formations in Alabama, 
Georgia, Tennessee, and Virginia. Yet with all this mapping and stratigraphic 
work very little has been done with the faunas. A few fossils were published, 
mostly without description, in reports on the geology of Alabama and Virginia, 
but similar reports on Tennessee are not provided with any helpful material on 
fossils. In fact only one paper on the brachiopods of the middle Ordovician of 
