186 The American Geologist. March, 1894 
Two very interesting specimens of Gryphaa from the <<»]- 
orado group of Huerfano Park. Colorado, were labelled 
■ I nijijra suborbiculata Lamarck." From the same district 
and formation were specimens of Trigonarca obliqva Mk., 
and of the recently described Cassidulus st<i„t<>ni (lark. 
Examples of Radiolites austinensis from Ellis county. 
Texas, were remarkable for being labeled "Eagle Ford shales." 
If not so labelled by mistake, they extend the known strati- 
graphic range Of this hippuritid 
The large Texan Timber ( reek Area (Barbatia) which, in 
his recent "Contribution to the Invertebrate Paleontology of 
the Texas 1 retaceous,"* the writer described as constituting 
a slight and even doubtful variety (tramitensis) of A. galli- 
• rtnei D'Orb., and from which the A. coalvillensis White seem- 
to differ, if at all. only in size was exhibited under the name 
Barbatia micronema 31k." If the names micronema and coal- 
villensis represent but one variety, whose larger examples 
equal those of the Texas shell in size, and which is identical 
with it in detail of sculpture, the names tramitensis and coal- 
villensa's must yield to the earlier name micronema, and the 
American variety would stand as A. galliennei D'Orb., var. 
micronema Mk. But whether the A. galliennei, from any of 
its American localities, shows differences sufficiently preva- 
lent to constitute a loeal variety, is quite doubtful, as has 
been admitted in attempting to establish such a variety in the 
ease of the Texas representative of the species. 
The association in the Timber Creek sandstone of Area 
galliennei, Glauconia (" Turritella' 1 '' ') renatixiana, and the 
American analogue (C. interlineatum) of Cerithium provin- 
ciate, characteristic species of the Chloritic chalk of France, 
an occurrence recorded in the above-named "Contribution," i- 
a significant fact, and would seem to indicate that these two 
formations are at least approximately synchronous. 
The gasteropod that was labelled "Glaiwonia coalvillensis 
Mk. Colorado formation. Upper Kanab valley. Utah," in the 
Survey exhibit, is indistinguishable from specimens of the 
-aim- species from the Timber Creek horizon of Texas. The 
Turritella coalvillensis of my "Contribution" and the Turri- 
*Fourth Annual Report of the Geological Survey of Texa6. See pp. 
1'-.- 170. 
