Paleozoic Bivalved Entomostraca. B41 
strongly inturned ventral border, fitted to receive the opposite 
overlapping edge. It exhibits the form of Schmidt’s LZ. Hisin- 
gert, having its short hinge-line and ovate outline, but is 
rather too full in the antero-ventral curve. 
This specimen was given to me by the late M. d’Hichwald 
some years ago, and is from the Upper-Silurian coral-limestone 
of Randifer, Isle of Oesel. It was labelled “Z. phaseolus, His.” 
Except that its hinge-line is rather shorter in proportion 
and its angles less acute, this minute form resembles in shape 
my fig. 3,6, pl. vi. Ann. & Mag. Nat. Hist. 1856. It has 
been somewhat cleared of its hard matrix since it came to me; 
hence its outline, as now visible, is broader than when it was 
labelled “‘ phaseolus,” and is more like that of L. Hisingert, 
Schmidt, to which [ refer it as a dwarf variety. 
The localities in Scandinavia and Russia where L. balthica, 
LL. Hisingert, L. phaseolus, &c. occur may be gathered from 
the memoirs of Kolmodin and Schmidt, by whom the many 
references made by Hisinger, d’Hichwald, and others are 
corrected according to the revised nomenclature of the species. 
In the ‘Neues Jahrbuch’ for 1867, p. 592, some Lower- 
Silurian Leperditia-marls are mentioned which seem to be 
the same as the Russian “ wayboards of greenish-grey or 
reddish shale” of Murchison’s ‘ Siluria,’ 1867, p. 356. In 
Scania, at Lake Ringshén, there are Silurian red sandy beds 
(overlying limestone) which contain small Leperditice similar to 
those from the Ludlow Passage-beds (jide K. Hébert, 1867), 
A, Leperditia phaseolus (Hisinger), var. marginata, 
(CEG ROD Ca ityer,, 11) 
~ Cytherina phaseolus, Hisinger, Anteckn. phys. &c. Heft 5, p. 110, pl. viii. 
‘fig. 3, Tableau, p. 2; Letheea Suec. p. 9, pl. i. fig. 1 (fide Kolmodin). 
1873. Leperditia Angelini, Schmidt (parte), Mém. Acad. Imp. Sci. St. 
Pétersb. sér. 7, vol. xxi. no. 2, p. 14, figs. 14 and 17 (fide Kolmodin). 
1880. Leperditia phaseolus, Kolmodin, Cty. K. Vetensk.-Akad. Forhand]. 
1879, no. 9, p, 134, fig. 4, a-e (Hisinger’s original specimen), and 
fig. 5, a, b. 
Pl. XIX. fig. 15. Thisis an outline of a small right valve, 
with the usual ventral overlap and a high convexity along 
the middle, which cannot be shown in the outline. It is 5 
inch long, and has an extremely delicate reticulation on a 
smooth surface; and the spots of eye and muscle are visible. 
This valve has also a narrow but distinct flat rim on the 
anterior and posterior margins. It lies in a compact cream- 
coloured ‘‘ calcaire 4 coraux,” one of M. d’Hichwald’s speci- 
mens from Randifer, Isle of Oesel, and it was labelled by him 
“Leperditia phascolus, His.” 
Ann. & Mag. N. Hist. Ser. 5. Vol. viii. 24 
