New and Little Known American Paleozote Ostracoda. 173 
NEW AND LITTLE KNOWN AMERICAN PALEOZOIC 
OSTRACODA., 
By 5. OF ULRICH: 
(Concluded from Page 137.) 
LEPERDITIA FABULITES, Conrad. 
Plate XI, Figs. 1 a—1 d, and 2. 
Cytherina fabulites, Conrad, Proc. Acad. Nat. Sci. Phil., 1843, 
Pp. 332: 
This much quoted and yet so illy known species, has been a 
source of much trouble to specialists in this class of fossils. My 
endeavors to collect a full series of specimens from localities in 
Wisconsin, Minnesota, Illinois, Kentucky and Tennessee, have 
been fairly successful, so that I am now able to point out and 
illustrate the really characteristic features of the species. 
Plate XI, figs. 1a, 4, c and d, represent four views (natural 
size) of a perfect example from near Beloit, Wis. The specimens 
from the northwestern localities are usually about one-third larger 
than those from Kentucky and Tennessee, but in all other respects 
they are practically identical. The shape, aside from peculiarities 
due to distortion, is very constant, the outer surface smooth or 
very faintly pitted under the glass. When in good condition, the 
outer surface exhibits not even a trace of the anterior tubercle and 
muscle spot which are such common features in this genus, but 
only a little weathering is required to disclose the suboval reticu- 
lated spot. The reticulation is in relief, from which it appears 
that the spaces enclosed by the meshes are composed of material 
giving way to the action of the weather with disproportionate 
rapidity. On the inner side, however, both the tubercle and mus- 
cle spot are clearly distinguishable, the former being represented 
here by a small but well-marked depression. (See fig. 2.) The 
muscle spot is surrounded by fine reticulating radial lines, short 
dorsally, longest postero-ventrally. 
Perhaps the most characteristic feature of the species is found in 
the small papillee which occur on the inner side of the ventral mar- 
