EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. llY 



In all probability Eicliwald has described this same species under 

 the name of Micropora rhombica, but his figures and description are 

 of little value for accurate identification. 



Occurrence. — In America EscTiarojJora suhrecta is a common foss0 



Fig. 44.— Eschaeopoka subeecta. a and 6, a titical specimen, natueal size and the basal portion 



OF THE SAME, X9; C, VIEW OF THE CENTRAL PART OF THE SAME ZOARIUM, X9; d AND e, TWO SPECIMENS, 

 NATURAL SIZE, BROADER THAN USUAL, THE LATTER EXHIBITING A ROW OF MONTICULES; /, SURFACE OF 

 THE LOWER PART OF ANOTHER EXAMPLE, X18, SHOWING UNUSUAL CONDITIONS; Q, TANGENTIAL SECTION, 

 X18, CUTTING THE IMMATURE AND MATX7EE PARTS OF THE ZOARIUM; h, PORTION OP A VERTICAL SECTION, 



Xl8. Black Rivee (Decorah) shales, St. Paul and Minneapolis, Minnesota. (After Uleich.) 



in the lower beds of the Black River (Decorah) shales of Minnesota 

 and Iowa. In Europe it is known only from the Wassalem beds 

 (D3) at Uxnorm, where specimens are equally abundant. (Cat. No. 

 57211, U.S.N.M.) 



British Museum, specimen and thin section from the Wassalem 

 beds, at Uxnorm. 



