EAKLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 



291 



and tangential sections. Another characteristic of the mesopores is 

 their comparatively straight walls which are in contrast with those 

 of other species of the genus. 



The hemispheric growth, great abundance of mesopores, large, 

 distinct maculae, absence of acanthopores, and the distinct tabulation 

 of both zooecia and mesopores, form a combination of characters 

 which amply distinguish the present form. 



Fig. 177.— Hemipheagma mxjltipoeatum. a, side view of the type-specimen before sectioning; 



6, TANGENTIAL SECTION, X8, SHOWING A MACULA IN THE LOWER PART OF THE FIGURE; C, PORTION OP 

 THE SAME, X20, "WITH THE MESOPORES SHADED TO DISTINGUISH THEM FROM THE ZOCECIA; d, VERTICAL 

 SECTION, X20, INCLUDING A MACULA; e, A PART OF THE SAME SECTION, X20, SHOWING THE DIFFERENCE 

 IN TABULATION BETWEEN ZOCECLi. AND MESOPORES. KUCKEES SHALE (02), BaEON TOLL'S ESTATE, 

 ESTHONIA. 



Occurrence. — Rare in the Kuckers shale (C2), Baron Toll's estate, 

 Esthonia, and in the Echinospherites limestone (Cl), at Duboviki, 

 on the Wolchow River, government of St. Petersburg. 



Eolotype.—<^Sit. No. 57421, U.S.N.M. 



British Museum, thin section of specimen from the Kuckers shale, 

 Baron Toll's estate. 



