EARLY PALEOZOIC BKYOZOA OF THE BALTIC PROVINCES. 337 



species of Hallopora, its diaphragms have at one time served as 

 closures for the zooecia, as shown in Dybowski's figure 1 i of plate 5. 

 The presence of these ornainental, centrally perforated closures, the 

 rounded zooecia and closely tabulated mesopores with straight walls, 

 and the absence of acanthopores, cause me to place the species in the 

 genus Hallopora. The growth is not in accord with this genus, nor 

 does the tabulation of zooecia strictly agree, so, for this reason, I am 

 questioning the generic identification. 



Fig. 212.— Hallopoea ? dtbowsioi. a, side vie"w of a small example, natural size; 6, basal view 



SHOWING "WRINKLED EPITHECA AND CICATRIX OE ATTACHMENT; C, AN AVERAGE TANGENTIAL SECTION, 

 X20; d, VERTICAL SECTION, X8, SHOWING THE NORMAL FEATURES OF THE SPECIES; 6, PORTION OF THE 

 SAME, X20; /, A LONG VERTICAL SECTION, X8, EXHIBITING THE DISTRIBUTION OF DL\PHEAGMS. TWO 

 OF THE ZOCECLiL TUBES REPLACE MESOPOEES. JEWE LIMESTONE (Dl), BaRON TOLL'S ESTATE, ESTHONIA. 



By examining a moistened longitudinal fracture with a hand lens 

 no difficulty will be experienced in separating associated hemis- 

 pheric bryozoans from this species. The specific name is in honor 

 of the excellent pioneer work of Dr. Dybowski upon Paleozoic 

 Bryozoa. 



Occurrence. — Abundant at various localities in Esthonia in forma- 

 tions ranging from the Echinospherites limestone (Cl) to the Wesen- 

 berg (E). The particular localities represented in the collection of 



