216 R. T. Hill—Outlying Areas of the Comanche 
List of Species. 
Fnallaster sp.—Fragments of an Kchinoid referred to this 
genus by Dr. W. B. Clark. It is not known in beds later than 
the Comanche series in America. 
Ostrea sp.—This species is probably a new form. In size and 
outline it resembles some specimens of O. franklini to which 
Prof. Cragin referred it, but there are noteworthy differences 
especially in the beaks and the cartilage pit sufficient for specific 
separation. This species is very abundant in the shales. 
Gryphcea pitchert Morton.—A few specimens from No. 2 of 
Blue Cut Mound section seem to belong to this species, though 
they may be the young of one of the related forms. 
Gryphea forniculata (White).—It is abundant in certain 
layers. It occurs in the Washita beds at El Paso and the 
Kiamitia beds of the Washita at Denison and many other places 
in Texas. 
Gryphea tucumearit Marcou.—Abundant in the upper part 
of the section at Blue Cut Mound. It is interesting to note that 
this form, supposed by Prof. Marcou to be Jurassic, here occurs 
above G. forniculata, which he considered Neocomian, though 
there is only a few feet difference in the beds and they seem to 
be connected by intermediate forms. The geographic distribu- 
tion of the two species is about the same. 
Eeogyra tecana Roemer.—There are only three specimens in 
the collection. It is abundant at El Paso in beds that are sup- 
posed to be Washita and it also occurs at Tucumcari Mountain, 
New Mexico. 
Plicatula senescens Cragin.—Originally described from this 
region. The material is not sufficient for critical comparison. 
Pecten sp.—A small smooth form like one that occurs in the 
Paw Paw beds of Denison. 
Avicula belviderensis Cragin. 
Avicula leveretti Cragin ?—Several specimens were collected in 
the shales of Blue Cut Mound, that agree fairly well with the 
figure and description of that species from the Kiamitia beds on 
Duck Creek, Texas. 
Inoceramus comancheana Cragin ?—Fragmentary impressions 
of a form closely related if not identical with this species from 
the Duck Creek beds. 
Lithophagus sp. nov.—Abundant burrowing in Gryphea for- 
niculata. 
Nucula catherina Cragin. 
Nucula sp.—Casts. 
Leda sp.—Casts. 
Trigonia emoryi Conrad.—This widely distributed species 
occurs at Tucumcari, El Paso, etc., and seems to have a great 
vertical range. It is found in the uppermost Washita beds at 
Denison and is reported from the Fredericksburg. 
Cardita belviderensis Cragin, 
