EAELY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 341 



It is also most likely that a number of forms was grouped under 

 this name, since the occurrence of the species is given as the Ordo- 

 vician limestone, in the vicinity of Zarskoje, Wesenberg, and Erras, 

 and the Silurian strata on the island of Oesel and 

 at Kamenetz Podolsk. 



ARCHEOPORA ANGULOSA Eichwald. 



Text fig. 215. 



Archeopora angulosa Eichwald, Lethsea Rossica, vol. 1, 

 186Op.410, pi. 26, fig. 2. 



^Stf^M^I 



»ss« 



|S8 



Fig. 215.— Archeopora 



ANGULOSA. a AND 6, 

 THE INCEUSTING TYPE- 

 SPECIMEN, NATURAL 

 SIZE AND ENLARGED, 

 SHOWING ANGULAR 

 ZOCECIA AND OPEN 



MESOPOREs. (After 

 Eichwald.) 



This species forms thin, incrusting expansions 

 upon EcTiinospherites in the Ordovician limestone 

 at Pulkowa and at Wesenberg, the figured specimen 

 being from the latter locality. Both the zooecia 

 and mesopores, as indicated in figure 215, are an- 

 gular, differing in that respect from A. lamella. I 

 am unacquainted with an incrusting form of this 

 sort from either Pulkowa or Wesenberg, but even were such specimens 

 before me, more specific characters than are given by Eichwald would 

 be necessary before an identification of any value could be made. 



ARCHEOPORA PUNCTATA Eichwald. 



Text fig. 216. 



Archeopora punctata Eichwald, Lethsea Rossica, vol. 

 1, 1860, p.406, pr.24, fig. 19. 



The description of this species includes more 

 details than that of any other of the various 

 Ordovician forms referred to the genus, and it 

 is possible that the new species, Favositella 

 punctata, described in this volume, is based 

 upon the same form. For this reason I have 

 selected the same name for the supposed new 

 species of Favositella and have indicated its 

 possible identity with Archeopora punctata in 

 the synonymy. Eichwald describes Archeopora 

 punctata as a thin, rounded, lamellar expan- 

 sion, with thick-walled, oval cells radiately 

 arranged. One end of the cell is higher than the other [lunarium], 

 and ten rows of cells occur in the space of a line. Eichwald's figure 

 also bears a resemblance to those of the Favositella, but in spite of 

 these several facts one can not be certain of the identity of A. punctata 

 until the type or authentic specimens are restudied. 



Occurrence. — Archeopora punctata was recorded from the Ordovician 

 (Orthoceratite) limestone along the Dolgaja River, Gdow district, 



Fig. 216.— Archeopora punc- 

 tata, a AND 6, the type- 

 speamen, natural size and 

 enlarged. ordovician 

 limestone, Dolgaja River, 



GOVERNMENT OF St. PETERS- 

 BURG. (After Eichwald.) 



