204 [Assembly 
Blue limestone, .... | ^"^"^ ^pecies,) new forms of Crino- 
, Asaphus pleiiroptyx, Delthyris macropleura, 
Gray shaly limestone Strophoniena costellata S. rugosa Atrypa 
J J I prisca, Conularia quadrisulcata, Calceola, 
^ (new.) 
Blue limestone, Pentamerus galeatus, Atrypa lacunosa. 
Shale, Astrocrinites, 
Black limestone, Asaphus micrurus, 
( Cytherina alta, 
( Tentaculites ornatus, 
*Shale, No organic remains, 
Shale Favosites gothlandica, 
Graywacke, No organic remains. 
Each of these formations is marked by a wide terrace suggesting the 
idea of a stair case on a large scale. This adds much to the picturesque 
beauty of the scenery at Schoharie, when viewed from a distant point. 
Shale, [ Cytherina aita, S Water lime series. 
Descriptions of new species of organic remains. 
Trilobites. 
Oclontocephahis selenurus. 
In Mr. Gebhard's collection I was fortunate enough to discover the 
thoracic plate of this trilobitc, and a whole specimen from Auburn has 
proved that the tail of Asaphus selenurus, and the head of Calymene 
odontocephalus belong to the same trilobite. The thoracic plate has 
teeth-like angular projections which interlock with another set on the 
front margin of the buckler, which I have deemed a generic character 
in conjunction with the peculiar form of the ribs and the still more sin- 
gular shape of the tail which has two long spines. Mr. Gebhard had 
drawn the inference that the two nominal species were identical in con- 
sequence of their frequent occurrence together in the rock. This trilo- 
bite characterizes a limestone above the grit which contains the Lower 
Ludlow fossils. 
Asaphus Hallii. 
I have given Mr. Hall's name to a species of Asaphus found by that 
geolofrist, at York, Livingston county. The lower part of the abdomen 
and tail are well preserved, but there is no line of division between the 
Mr. Gebhard found his fine specimen of stroatiun and barytes in thi§ shale. 
