EAELY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 289 



ciated ramose bryozoans. The thick-walled subangular zooecia and 

 mesopores, practical absence of acanthopores, and the few semidia- 

 phragms will separate it from other species of the genus. 



Occurrence. — Not uncommon in the Wassalem beds (D3) at 

 Uxnorm, Esthonia. 



Cotypes.—Csit. No. 57420, U.S.N.M. 



British Museum, one specimen and one thin section. 



^r-u<^ 



Fig. 176. — Hemipheagma pygmjsum. a, side vie'W of a typical specimen, X2; 6, an oedinaet tan- 

 gential SECTION, X20, SHOWING THE CONSPICUOUSLY LAEGE, NUMEEOUS ACANTHOPOEES; C, POETION 

 OF THE SAME, X35, "WITH MOEE DETAILED STEUCTUEE OF THE ACANTHOPOEES AND "WALLS; d, VEETICAL 

 SECTION, X20, "WITH CHAEACTEEISTIC TABULATION. ChASMOPS LIMESTONE, SOUTH OF B5DAHAMN, 

 ISLAND OF O ELAND. 



HEMIPHRAGMA PYGM^UM, new species. 



Text fig. 176. 



In the collection made by Dr. Bather from the Chasmops limestone, 

 near Bodahamn, Oeland, are several specimens of a small, massive 

 EemipJiragma, which proved upon study to have some very striking 

 internal characters. The zoarium of the specimens observed is of 

 small pedunculate masses about 8 mm. in height and the same meas- 

 urement in their greatest width. The general shape of the zoarium, 

 as well as the smooth surface of one of the types, is shown in figure 

 176 a. Maculae are observed with difficulty at the surface, the most 

 striking feature here being rather small, polygonal to rounded zocecia, 

 numerous angular mesopores, and many large conspicuous acantho- 



