EAELY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 343 



CALAMOPORA RETICULATA Eichwald. 



Text fig. 218. 



Calamopora reticulata Eichwald, Lethaea Rossica, vol. 1, 1860, p. 469, pi. 23, 

 figs. 6 a, h. 



The Ordovician specimen figured by Eichwald under the above 

 name is probably a well-preserved fragment of HemipJiragma panderi 

 (Dybowski). This identification can not of course be made positively 

 without a study of the figured example, but the ramose zoarium, shape 

 of zooscia, absence of mesopores, and especially the arrangement of the 

 numerous acanthopores recall the HemipJiragma. 



CALLOPORA LIGNIFORMIS Dybowski. 



Plate 5, fig. 5, 5 a. 



Callopora ligniformis Dybowski, Die Chaetetiden der Ostbaltischen Silur-Form., 

 1877, p. 116, pi. 4, figs. 5, 5a. 



According to Dybowski, the zoarium of this species is of cylindrical, 

 solid, ramose, smooth branches, with an internal structure much like 

 his Callopora nummiformis. I have not come 

 across specimens mth these characteristics and 

 can not place the species. 



Occurrence. — Probably in the Wassalem beds 

 (D3), Wassalem and Erras, Esthonia. 



CALLOPORA PIRIFORMIS (Eichwald). 

 Plate 5, figs. 6, 6a, 66. 



Dianulites piriformis Eichwald, Zool. spec, vol. 1, 1832, 



p. 181, pi. 2, figs. 1, 2. 

 Chsetetes piriformis Eichwald, Lethsea Rossica, vol. 1, 



1860, p. 478. 

 Callopora piriformis Dybowski, Die Chaetetiden der 



Ostbaltischen Silur-Form., 1877, p. 117, pi. 4, fig. 6 



a, b. 



Fig. 218. — Calamopoka 



RETICULATA. a AND 6, 

 ZOARIUM NATUltAL SIZE 

 AND SURFACE EN- 



LARGED. 

 "WALD.) 



(After Eich- 



Although this species seems to have been 

 fairly well figured by Eichwald and later by 

 Dybowski, I am unable from either their descriptions or figures to 

 place it definitely. Dybowski mentions the great resemblance of its 

 internal structure to that of his Callopora nummiformis ( = Hallopora ? 

 dyhowskii), but his figures, although bearing out his remarks in part, 

 show an almost complete absence of diaphragms in the zooecial tubes. 

 At any rate, Dianulites piriformis must be regarded as one of the 

 undetermined species. 



Occurrence. — Formation B, Pulkowa, government of St. Petersburg. 



