Paleozoic Bivalved Entomostraca. 339 
3. Leperditia Hisingert, Schmidt. 
(Pl. XIX. figs. 5, 6, 16: small and varieties.) 
1837. Cytherina balthica, Hisinger, Leth. Suec. a IO), joke bo-Srep sates, Al, 
1854. Cythere baltica, Romer in Bronn’s Leth. Geogn. ii. p. 528 (parte), 
Toll, woe THe, Bh, Gy Dy @ 
1856, Leperditia balthica, Jones, Ann. & Mag. Nat. Hist. ser. 2, 
vol. xvii. p. 85 (parte), pl. vi. figs. 3, a-e. 
1858. Leperditia marginata, Schmidt, Untersuchungen &c. p. 192 
(parte). 
1860. Leperditia baltica, Hichwald, Leth. Rossica, p. 1329 (parte). 
1869. Leperditiabaltica, var. b, Kolmodin, Sveriges Siluriska Ostracoder, 
p. 14, figs. 4, 5. 
1873. Leperditia Hisingert, Schmidt, Mém. Acad. Imp. Sci. St. Pétersb. 
sér. 7, vol. xxi. no. 2, p. 16 (figs. 22, 23, var.). 
- 1880. Leperditia Schmidti, Kolmodin, Cifversigt af Kong]. Vetenskaps- 
Akademiens Forhandlingar, 1879, no. 9, p. 133. 
Pl. XIX. figs. 5 a, 5 6. This fragmentary but interesting 
relic (front moiety) of a small right valve was collected by the 
late H. A. Wyatt-Edgell, Esq., in the “ Upper Llandovery 
Sandstone ” of Hastnor, near Malvern. It is white, with the 
outer layer flaking off. When perfect it was probably about 
35 Inch long. 
As far as the imperfect contour allows of reconstruction, 
this seems to come nearest to Schmidt's L. Hisingert of any 
of the British specimens that I have seen, being more ovate 
than any other, and with probably a short hinge-line. It 
shows the eye-spot, a slight nuchal furrow, and a trace of 
the muscle-spot. We may refer to it as a dwarfed individual 
L. Hisingert, Schmidt. 
Dr. Holl has collected an apparently similar Leperditia (as 
a cast) from the “ May-Hill Sandstone” of Hastnor, which 
is the same formation. 
A perfect carapace, about $ inch long, but unfortunately 
partly imbedded, of Leperditia Hisingeri (?), has been col- 
lected by Mr. G. F. Whidborne, F.G.S., in the Upper-Silu- 
rian Limestone of Colwall Copse, near Malvern. 
Pl. XIX. figs. 6a, 66, 6c. ‘This is a ferruginous internal 
cast of a small left valve, 3% inch long, with short hinge-line, 
from the Tilestones (uppermost Silurian) of Kington, in Here- 
fordshire. It was collected by Mr. Richard W. Banks, of that 
lace. 
In the outline, fig. 6, a, we see an approach to Fr. Schmidt’s 
fig. 23, regarded by him as a varietal form of Leperditia 
Hisingert; but the postero-dorsal slope in fig. 6,a, has a 
lower angle, giving a greater ellipticity to the region below. 
Our cast somewhat resembles also our fig. 10 at first glance ; 
but its hinge-line is relatively shorter, and its front half has 
