LYMNEIDZ OF NORTH AMERICA. 101 
“The species is named in honor of Mr. Scudder, who first indicated 
the presence of Mollusca in these beds.” (CkIl.) 
Galba sieverti (Cockrell). Plate XVII, figure 14. 
Lymnea sieverti CocKERELL, Bull. Amer. Mus. Nat. Hist., XXII, p. 461, 
fig. 3, 1906; Nautilus, XXII, p. 70, 1908. 
“SHELL: “Long. 8 mm., lat. 4%, with about five rounded whorls ; 
length of aperture about 5 mm.; sutures impressed; sculpture weak; 
aperture contracted.” (CkIl.) 
Type: University of Colorado. 
Horizon: Florissant formation; Oligocene Period. 
Locatity: Station 1, vicinity of Florissant, Teller County, Colo- 
rado. 
Remarks: “This has the pointed spire of L. meekii Evans and 
Shumard, of the White River group, but it is much smaller and has 
more rounded whorls. The elongate narrow aperture is more like 
that of L. meeku than of L. shumardi Meek and Hayden. The much 
more convex whorls distinguish it from L. similis Meek, and L. vetusta 
Meek, from the Bridger Eocene. 
“The specimen shows the interior of the shell, and the outside of 
a portion near the mouth. It is of course dextral, though from the 
manner of its preservation the aperture shows on the left side.” (CkIl.) 
Sieverti is a neat little species, having affinities, apparently, with 
the truncatula group of Lymnzas. 
Galba florissantica (Cockerell). Plate XVII, figure 5. 
Lymnea florissantica CocKERELL, Nautilus XXII, p. 69, November, 1908. 
“SHELL: “Length, 21 mm.; diameter, about 1014; spire short, 
scarcely over 5 mm. long, the whorls moderately convex ; body-whorl 
not very convex, with coarse, shallow, vertical grooves.” (CkIl. ) 
Type: University of Colorado. 
Horizon: Florissant formation, Oligocene Period. 
Locatity: Station 1, near Florissant, Teller County, Colorado. 
Remarks: Prof. Cockerell (op. cit.) believes that this species 
is a Miocene representative of Galba emarginata. Emarginata is, how- 
ever, quite different (see the figures and descriptions in the systematic 
portion of this work) and, in fact, is a modern species, possibly differ- 
entiated since the Glacial Period. The general shape of the fossil, so 
far as that can be made out from the photograph of the rather im- 
perfect specimen kindly provided by Prof. Cockerell, would seem to 
place it in the palustris group of Lymneas. It is quite unlike the other 
described species of the Oligocene Period. 
