94 GEOLOGICAL SURVEY OF THE TERRITORIES. 
GONIOBASIS GRACILENTA Meek & Hayden. 
The type specimens of this species were discovered by Dr. Hayden in 
the Judith River series of the Upper Missouri River region. It is — 
described and figured in vol. ix, U. S. Geol. Sur. Terr. (4to ser.), p. 568, 
pl. 42, fig. 3. Ihave recognized the species among the Laramie fossils 
collected in the valley of Crow Creek, Northern Colorado; and among 
those of Black Buttes Station, in Southern Wyoming, is a form which, 
although rather more delicate ‘than the type specimens of-the species, 
appears to be identical with it. 
GONIOBASIS CONVEXA Meek and Hayden. 
GONIOBASIS INVENUSTA M. & H. 
GONIOBASIS SUBLAEVIS M. & H. 
GONIOBASIS? OMITTA M. & H. 
GONIOBASIS? SUBTORTUOSA M. & H. 
These five species were collected by Dr. Hayden from the Judith 
River series of the Laramie Group, near the mouth of Judith River, 
Montana. They are described in vol. ix, U.S. Geol. Sur. Terr. (4to ser.), 
pages 562, 564, 567, 568, and 569, respectively; and all are figured on 
plate 42 of the same volume. The last-named species is almost certainly 
not a Goniobasis, but it perhaps belongs to the genus Cassiopella White. 
GONIOBASIS NEBRASCENSIS Meek & Hayden. 
GONIOBASIS TENUICARINATA M..& H. 
These two species were originally discovered by Dr. Hayden in the 
Fort Union series in the Laramie strata, in the Upper Missouri River 
region. They are described in vol. ix, U.S. Geol. Sur. Terr. (4to ser.), 
pages 565 and 566, respectively, and both are figured on plate 45 of the 
same volume. The former species has been obtained by myself from the 
Laramie strata of Crow Creek, Northern Colorado, and I identified it 
also among some fossils brought by Professor Powell from the Canon of 
Desolation, Green River, Utah. Both species are also coutained among 
Lieutenant Wheeler’s collections from Wales, Utah, which were described 
and figured by me in vol. iv, Expl. and Sur. West of the 100th Merid., 
pages "212 and 213, pl. xxi, figs. 9 and 10. 
Genus MELANIA Lamarck. 
MELANIA ? INSCULPTA Meek. 
Plate 20, fig. 4 a. 
Melania? insculpta Meek, 1873, An. Rep. U. 8S. Geol. Sur. for 1872, p. 515. 
The following is Mr. Meek’s description of this species, together with 
his remarks upon it: 
‘¢ Shell terete or elongate subconical ; volutions apparently about ten, 
convex, or sometimes flattened convex, increasing gradually in size ; last 
one not much enlarged and without an angle around the middle, some- 
times slightly concave above in large specimens; suture well defined ; 
aperture unknown. Surface ornamented with distinet, nearly straight 
or slightly arched vertical costz, about sixteen of which’ may be counted 
on each volution, while crossing these are smaller, regular, deep revolv- 
ing furrows that cut each rib into five or six little transverse nodes which, 
