Series in Kansas, Oklahoma and New Mexico. 231 
Of the remaining six, one, Cytherea leonensis Conrad, is a 
form which is reported in the Mexican Boundary Report from 
near Leon Springs. The writer has never seen this species 7 
situ. Ostrea Marshii is a form which Dr. B. F. Shumard 
ealls O. swbovata, and which he has identified from his 
“‘ Washita limestone,’ which is practically synchronous with 
the whole of our Washita division. Of this species he says :* 
“T have before me specimens of 0. swhovata from Fort Washita, 
several localities in Grayson and McLennan counties, and from 
Mt. Bonnell, near Austin, some of them in a beautiful state of 
preservation, and have compared them most carefully with Mar- 
cou’s figure of Ostrea Marshii, in the Geology of the U. 8., with- 
out being able to detect any difference whatever of specific value. 
. . . I have also compared my specimens of O. subovata with an 
authentic example of O. Marshii from Europe, and regard them 
as being specifically distinct, as much so as we usually find in 
closely allied species.” 
Protocardia multistriata Conrad is a species of Protocardia 
which may occur in both the Fredericksburg and Washita 
divisions. The writer has specimens from the Denison beds of 
the Washita division which are indistinguishable from it. 
This leaves only three species, Zurritella servatum-granu- 
lata Roemer, Hxogyra texcana Roemer, and WVerthea ocerden- 
talis Conrad, which may have a common range into both the 
Washita and Fredericksburg divisions. 
The absence of the rich fauna of the Fredericksburg and 
Glen Rose which constitutes the great thickness of the Central 
Texas section is conspicuous. 
It must be apparent that the fossils from the Comanche 
Cretaceous at Tucumeari are nearly related to the faunas of 
the Washita division of North Texas, and to the Trans Pecos 
and Belvidere regions, and they show certain transitional con- 
ditions between the variations seen in the faunas of these 
extreme localities, such as the occurrence of species so far as 
known hitherto found in only one of the regions, such as Z'wr- 
binolia tewana, of El Paso region, O. guadriplicata Shumard, 
of the Central Texas region, Ammonites leonensis Cragin, of 
the Central Texas and Trans Pecos region, and Pinna coman- 
cheana Cragin, Lroudaria ? quadrans Cragin, and Cardita 
beluiderensis Cragin, of the Belvidere region. 
The age of the arenaceous beds underlying the first fossili- 
ferous horizon of Tucumcari is still problematic. In previous 
papers the writer has noted their lithologic resemblance to the 
oo" arenaceous Trinity littoral of the Comanche series of 
exas. 
* Trans. Academy of Science, St. Louis, 1860, vol. i, No. 4, p. 587. 
