OF DENISON UNIVERSITY. 
69 
This species is found rarely in the shales below the congl. I. 
There is an a priori improbability that this species exists in Bel- 
gium as well as in America, but the identification of Dekoninck is 
positive. . 
San^uinolites ^Sjohenotiis) contractus, W. w. 
(Plate XII, Fig. 4.) 
A form identified with this Chemung species is found in shales at 
Moot’s run, in the nodule layer, hence perhaps sixty feet below the 
horizon of S. rigidus=transversus. From that species it differs in be- 
ing less robust, longer, less rigid, and in having less obtuse post infe- 
rior extremity. 
The group of species here associated is a very intimate one and 
the specific distinctions may prove illusory. 
Sanduinolites iSphenotus) flavins, H ? 
(Plate IX, Fig. 10.) 
The resemblance between Sp. valvulus and Sp. flavius", as fig- 
ured by Hall, is so close that one would be tempted to combine them 
unless full suites attest their autonomy. 
Our specimens vary considerably, and in the surface characters 
resemble Sp. flavins, but often have more the outline of Sp. valvulus. 
The resemblance to small forms of Sa/iguinolites naiadiformis is great. 
From S. unioniformis with which they are associated they may be dis- 
tinguished by the greater size and more produced posterior margin. 
Length 48 mm; width 18 mm. 
Specimens found only in layer of shale a few feet below con- 
glomerate I. 
Sanfluinolites (Glossites) ainygclalinus, Win? 
This species is apparently represented in our collections, but not 
in specimens in suitable condition to describe. Its position is in the 
shale below congl. I. 
