',174: The A >uei'/'c((ii Geoloyist. DecembLM, i,s9i> 
and Tucuiucari zones of the Kiowa shales, giving particular 
attention to the characters of beaks, cartilage-pit and adduc- 
tor scar, the writer is compelled to differ from Mr. Stanton 
when he says that "this [the Kiowa shales] species is proba- 
bly a new form," finding no constant nor nearly constant dif- 
ferences from Oatrea franklini. 
Ostrea qtiadruplicatM, which has been found in the upper 
part of the Kiowa shales of Clark county and in the Mentor 
beds of Saline and Ellsworth* counties, Kansas, has not been 
reported lower than the upper part of the Washita within the 
typical area here considered. It has been recorded as occur- 
ring in a limestone (the Kent bed) a few feet above one con- 
taining Grtiphd'a fiicifuicarii and Srhloeitbachia leonensis and 
underlying the zone of J^Jji/'d.sfer elcf/ans and TloUisfer sl)nplej: 
(Fort Worth zone) in the eastern ])art of El Faso county, 
Texas, by Messrs. Dumble and Cummins in their interesting 
Kent section, published in the American Geologist of Novem- 
ber, 189:5. 
Osfren siibocafu occurs in most of the terranes of the Frc^d- 
ericksburg, Washita, and Denison divisions, being found at 
least as low as the summit of the Bosque and as high as the 
Choctaw limestone. 
Grypha'a roemeri is abundant in the Kianiitia and ranges 
up into the Duck Creek. 
Gryph<va tKcirni.carli is recorded by JProf . Hill as occurring 
on the '"plains of the Kiamitia,"' but the horizon of its oc- 
currence there is not given. By Messrs. Dumble and Cum- 
mins it is recorded as occurring below the Kent bed (vide 
ut infra ) at Kent, Texas, associated with Schloeidxtchin pe- 
ruviana and t>. h'oueusi.s^ a little above the lowest occurrence 
of the latter. 
Exogyra texana, in the typical area, is chiefly a Fredericks- 
burg form. It is also common there in the upper Grlen Kose 
beds of the Bosque division, but it does not occur in the 
Washita division within that area so far as known. Nor has 
*For his knowledge of the occurrence of this fossil in Ellsworth county 
the writer is indebted to specimens in the museum of the State Univer- 
sity of Kansas, collected by the late Judge E,P. West. These specimens 
were laljeled as having come from the base of the Dakota on Alum creek: 
but as the Mentor terrane was then supposed to constitute the base of 
the Dakota, there can be scarcely a doubt as to the specimens having 
been foinid in the Mentor beds. 
