P. itys. This species can be readily recognized by the 
fact that the revolving striae are crossed and caucellated by 
distinct concentric striae. Sometimes found at Pratt’s 
Falls, more common in the shale near Skaneateles Lake. 
Loxonema.—Two species of this genus also deserve 
similar mention. 
L. Haniltoniae is the most abundant. It has an elon- 
gated shell of usually not more than a dozen volutions. 
Its surface it marked by distinctly arched, longitudinal 
striae Found at Pratt’s Falls and Delphi. 
L. Delphicola is not as abundant as the preceding, and 
differs from it in that its shell is broader, expanding more 
rapidly, its volutions are more convex, and its striae less 
curved. It is found at Delphi. 
Other gasteropods are the Cyclonema Hawiltoniae, 
Macrochetlus macrostomus and Lellerophon patulus, B. 
thalta. 
Brachiopods continue to be found in large numbers, 
the genus Spzrzfera being the most abundant. A few of 
the more common species are: Spzrifera granultfera, S. 
pennata, S. medialis, S. Tullia. Other abundant species 
are: Athyris spirtferoides, A. cora, Productella truncata, 
P. Tullia, Chonetes mucronata, Atrypa reticularis, Tropt- 
adoleptus carinatus. Several species of Orthis, Rhyn- 
chonelba and Strophodonta also occur. 
Lamellibranchs.—If space and time permitted, we 
would speak of this class veryelaborately. In the preced- 
ing groups we did not find it very well represented, but it 
now becomes quite abundant, lamellibranchs being fully 
as common as brachiopods. The handsome genus Gram- 
mysia is represented by a half dozen species, Avzculas 
occur in even greater profusion, the beautiful Muczula, the 
interesting Gontophora, with a host of other genera, are 
all found in this group. Some of the more abundant 
species are: Grammysia arcuata, G. lirata, G. bisulcata, 
42 
