( 697 ) 
So in all 831 pieces. The number found is presumably much larger, 
because I have only mentioned here the boulders which beyond any 
doubt belong to this group; among the numerous limestones with 
Leperditia-remains which cannot be specifically determined there 
will no doubt be a number of this age. 
Leperditia baltica Ws. sp. 
Literature: 1869. Kotmopin, 2, p. 13, f. 2—8. 
1873. Scampr, 4, p. 15—17, f. 49 
L876. Roemer, o, 0.1958 7. 
1878. Martin, 6, p. 45. 
1880. Koxmopiy, 8, p. 154. 
1883. Scum, 10, p. 11—13, T.L f. 1—3s. 
1884. Kiesow, 11, p. 275, T. IV, f. 4. 
1885. Rrurerú, 13, p. 26, no. 226. 
1888. Linpstrém, 16, p. 5, no. 25. 
1890. Kimsow, 19, p. 89—91, T. XXIII, f. 14—16. 
1890. Scumpr, 20, p. 255. 
1890. Dames, 21, p. 1125. 
1891. Krause, 22, p. 5, 7. 
1891. Krause, 23, p. 488, T. XXIX, f. 1 
1891. Scumipt, 24, p. 123. 
1895. Srorrey, 27, p. 109. 
1898. Bonnema, 29, p. 452. 
1900. CranreLewskKi, 30, p. 17—20, 33; T. I, f. 17—20. 
1900. Bonnema, 31, p. 138—140. 
21. 
oO. 
From the literature about this fossil, cited above, which as regards 
the later years is rather complete, it appears that for a long time 
a certain confusion and uncertainty about the limits of the species 
have existed, which have been removed but a few years ago. 
Besides the real 4. baltica His., characterized by the comb-shaped 
striae on the inverted plate of the left valve (L. pectinata Scumipr) — 
which characteristic may be distinctly perceived in twenty of the 
boulders from here —, Scumipr had also described another species : 
EL. Kiehwaldt Scum. Boxxema has proved that both species have to 
be united (31); at nearly the same time this has also been observed 
by CraierewskKr The latter, however, distinguishes besides the typical 
form two other varieties : 
L. baltica, var. Lichwaldi Scumit 
x nd … formosa CHMIEL. 
These two varieties are present among our boulders, var. Lichwaldi 
