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Leperditia Hisingeri Scumwpr. 
ScuMIDT, 10, p. 14—16, T. I, f. 5—7. 
identical with Leperditia Schmidtii Kormopix, has already been known 
for a long time from the neighbourhood of Wisby, where it frequently 
occurs in the Stricklandinia-shale; esp. near Snäckgärdet I found 
beautiful loose specimens. But it also occurs south of Wisby in 
LinpstrOMs stage c,; according to KormopiN moreover also in the 
shale of Westergarn (c‚) and Capellshamn (7, p. 138). In Esthonia 
this fossil belongs to the zones G, and G,, and is found there in 
many places, also in Dagö. Our specimens are on an average much 
smaller than those of Gothland, but for the rest correspond very 
well in their relative dimensions with the description of the true 
form. As already stated, this species is also found near Christiania. 
Linpstrém states moreover, that it is found in Seania (17, p. 25); 
I failed to find out on what grounds this notation is based, and 
have reasons to doubt of the truth of it. 
Kirsow writes that he has found it in German boulders from 
Spengawsken in West-Prussia and in a limestone (not corresponding 
with ours) which curious enough also contains Leperditia baltica 
His. (11, p. 274). Cnumietewskt on the other hand has not come 
upon the true species in East-Prussia and Kowno (34). KRaAusE, 
again, has found it in Neubrandenburg (24, p. 7) and Sroruey in 
a bright yellow, erypto-öolitie limestone from Sleswick-Holstein (30, 
p. 109). 
Strophomena pecten L. 
is a fossil generally occurring in the Jörden and Raiküll beds in 
Esthonia; in Gothland it is frequently found near Wisby and our 
specimens correspond most with this occurrence. Linpsrröm, however, 
mentions it from e-h; hence I should not be surprised if different 
varieties of this species were to be distinguished. Wiman also states 
to have found it in Jemtland in the quartzite with Phacops ellipti- 
frons Eso. (29, p. 270). 
Gace has deseribed it from boulders of Beyrichia-limestone 
(20, p. +7) from East- and West-Prussia ; various authors moreover 
mention it in boulders of different age, which strengthens my opinion 
to draw no important conclusions from this species. 
Vincularia nodulosa Eicuw, and V. megastoma Etcuw. 
Eicuwatp, 5, T. XXIV, f 8 and 9, 
are very characteristic of the Raikill stratum in Esthonia and are 
