EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 141 



Occurrence. — Eicliwald records the species from Poulkowa. All of 

 the specimens before me come from the Wesenberg limestone (E) at 

 Wesenberg, Esthonia. 



Plesiotijpes. —Csit. No. 57236, U.S.N.M. 



British Museum, specimens and thin sections from Wesenberg 

 limestone, at Wesenberg, Esthonia. 



'•r-'O- O; 0-'£' 



•^^ -^ / ,-=*. >^ /~\ " * V 



<3H.U-.iO?vgr-.;C 





Fig. 64.— Pachydictta flabellum. a, tangential section, X20, theough an old portion of the 

 zoarium; b, another tangential section, X20, sho"wing the appearance in the early portion 

 of the mature zone; c, tangential section of a young example, x20, "with open mesopores; 

 d, the usual aspect of vertical sections, x20; e, vertical section, x20, of young speamen. 

 Wesenberg limestone (E), Wesenberg, Esthonia. 



PACHYDICTYA CYCLOSTOMOIDES (Eichwald). 



Text figs. 65, 66. 



Micropora cyclostomoides Eichwald, Bull. Soc. Nat. Moscou, No. 4, 1855, p. 459; 

 Lethaea Rossica, vol. 1, 1860, p. 394, pi. 24. fig. 16 a, h. 



Eichwald' s figures of Micropora cyclostomoides clearly indicate a 

 broad, branching species of PacJiydictya, with rather large apertures. 

 His types were registered from the "calcaire a Orthoceratites de 

 Wesenberg et d'Erras." This would imply, although not necessarily 



