EAELiY PALEOZOIC BEYOZOA OF THE BALTIC PEOVINCES. 49 



1854. EiCHWALD, Edouard von. Die Grauwackenschichten von Liv- und Esth- 



land. Bulletin de la Societe Imperiale des Naturalistes de Moscou, vol. 27, 



pp. 86-89. 

 1856. Beitrag zur geograpMschen Verbreitung der fossilen Thiere Russlands. 



Bulletin de la Societe Imperiale des Naturalistes de Moscou, vol. 29, pp. 91-96, 



448^66. 

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 1860. EiCHWALD, Edouard von. Lethaea Rossica, vol. 1, xincienne Periode, pp. 



355-419, 434-435, 450-452, 475-494, pis. 23-28. 

 1860. Milne-Edwards, Henri. Histoire naturelle des Coralliaires on polypes pro- 



prement dits, vol. 3. 

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134 pp., 4 pis. 

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Corals of the Paleozoic period, with critical descriptions of illustrative species, 



342 pp., 15 pis. [Bryozoa, pp. 253-327, pis. 12-15.] 

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HANGE OF BALTIC ORDOVICIAN AND EARLY SILURIAN BRYOZOA. 



In the following table I have arranged all of the species recognized 

 as valid in the present volume in biologic order, and have indicated 

 their geologic range in both Russian and American formations. The 

 latter are abbreviated as follows: 



Platteville = P; CUtambonites = C; Stictoporella = St ; Nemato- 

 pora = N; Rhinidictya = R ; Fusispira = F; Ctenodonta = Ct ; Rich- 

 mond =R; Phylloporina = Ph ; Clinton = CI. 



