336 Prof. T. R. Jones on 
in length, from the Upper Silurian of Wisby, Gothland. It 
was collected by Dr. G. Lindstrém, and is marked “ No. 
58689” in the British Museum. 
In its sloping ventral border it is very close to fig. 23 in the 
plate illustrating Schmidt’s memoir on the Silurian Leper- 
ditie of Russia, &c., which he regards as a long-backed 
variety of his ZL. Hisingert; but in our fig. 10 the contour of 
the antero-ventral region is too full. Its great length of 
hinge-line is characteristic of the true ZL. balthica, of which 
species I take this to be a small individual, with the usual 
nearly level ventral line of the left valve. 
Pl. XIX. figs. 11 a, 116. A rather larger and more convex 
valve (right), $4 inch long, from the same place and collection 
(and numbered the same) as the last. In its greater ventral 
rotundity compared with that of its fellow (fig. 10), this speci- 
men. approaches Schmidt’s subrotund variety of his L. Hisin- 
gert (fig. 22, loc. cit.) ; but its postero-ventral curve falls 
short to some extent, and its hinge-line is too long. This 
specimen seems to me to be the right (larger) valve of a small 
L. balthica. 
Pl. XIX. figs. 1 a, 1 6, show the hinder moiety of a damaged 
right valve from the Wenlock Limestone of the Wren’s Nest, 
Dudley. It belonged to Mr. John Gray’s collection, and is 
marked “ No. 58892” in the British Museum. 
This imperfect valve (probably 8, inch long when perfect) 
has relatively a rather long hinge-line; and its nearly oblong 
outline is by no means sufficiently ovate to match Schmidt’s 
fic. 23 before mentioned. It appears to be asmall L. balthica, 
very narrow for a right (overlapping) valve. 
In 1864 I saw in the Ludlow Museum a good cast of such 
an oblong Leperditia as the above described, 3 inch in length. 
It was collected by Mr. Lightbody in the yellowish Downton 
Sandstone of the Upper Ludlow series, at Ludford Park, Old 
Leominster Road, near Ludlow. 
Pl. XIX. figs. 4a, 46. These outlines illustrate two speci- 
mens of left valves of different sizes, and more or less damaged 
by crushing, from a band of bluish-grey shale at the Ham- 
mond Hill cutting on the Bromyard and Worcester Railway, 
in Herefordshire. They were collected by Mr. George Reece, 
of the Worcester Museum; and the Rev. W. 8. Symonds, 
F.G.8., who kindly communicated the specimens in 1877, 
states that this particular band “lies quite at the base of the 
Old Red, and is perhaps the equivalent of the grey bands in 
the passage-beds at Ledbury Tunnel, Herefordshire *, which 
contain the fishes Auchenaspis Salter’ and A. Egertont.” 
* See Quart. Journ. Geol. Soc. vol. xvi. p. 193, and vol. xvii. p. 162. 
