EAELY PALEOZOIC BEYOZOA OF THE BALTIC PEOVINCES. 321 



DIPLOTRYPA MONILIFORMIS, new species. 

 Text fig. 199. 



Cir.DiplotrypaneglectaVi.Ricn, Geol. and Nat. Hist. Surv. Minnesota, vol.3,pt. 1, 

 1893, p. 287, fig. 19. 



The species for which the above new name is proposed is closely 

 related to the form described by Ulrich from the Nematopora bed of 



Fig. 199.— Diploteypa monilifoemis. a, side view of a zoaeium, natueal size; 6, tangential sec- 

 tion, X20, EXHIBITING MESOPOEES MOEE NUMEEOUS THAN USUAL; C, VEETICAL SECTION, X8, PASSING 

 THEOUGH SEVEEAL SUCCESSIVE MATURE AND IMMATUEE EEGIONS, ELLUSTEATING THE VEET IREEGU- 

 LAB CEENULATED WALLS AND THE SIMILAE TABULATION OF BOTH SETS OF TUBES; d, POETION OF THE 

 SAME SECTION, X20, SHOWING WALL STEUCTUEE MOEE CLEAELY. JEWE LIMESTONE (Dl), BAEON 



Toll's estate, Esthonia. 



the Trenton formation at Hader, Minnesota, as Diplotrypa neglecta. 

 Each agrees in having irregularly arranged polygonal zooecia with 

 rather few mesopores, variable in size and distribution, and often 

 distinguished from the zocecia with difficulty. The aspect in vertical 

 section is likewise very similar, although the irregularity of the walls 



