EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES, 143 



The large oval zooecia and broad branches with maculse will dis- 

 tinguish P. cydostomoides from the other Baltic species. Among the 

 American forms none of those with a similar growth has zooecia of 

 the same size. 



Occurrence. — ^As stated above, Eichwald records the species from 

 Wesenberg and Erras. Specimens which I have identified with it 

 occur abundantly in the Kuckers shale (C2), Baron Toll's estate; 

 in the Jewe hmestone (Dl), St. Mathias; and in the Kegel limestone 

 (D2) at Kegel, Esthonia, The species is also present in the Chasmops 

 limestone at a locality on the island of Oeland, south of Bodahamn. 



Plesiotype.— Cat. No. 57238, U.S.N.M. 



Specimens from the Jewe hmestone, St. Mathias, Kuckers shale, 

 Baron Toll's estate, and from the Chasmops hmestone, island of 

 Oeland, are in the British Museum collections. 



PACHYDICTYA BIFURCATA (Hall). 

 Text figs. 67, 68. 



Stictopora bifurcata Hall, Twelfth Ann. Rep. Indiana Geol. Nat. Hist., 1883, 



p. 267, pi. 13, figs. 3, 4. 

 Pachydictya bifurcata Foerste, Bull. Sci. Lab. Denison Univ., vol. 2, 1887, p. 163; 



vol. 3, 1888, pi. 15, fig. 10; Geol. Surv. Ohio, vol. 7, 1895, p. 599, pi. 28, fig. 9. 

 Stictopora scalpellum Eichwald (not Lonsdale), Lethaea Rossica, vol. 1, 1860, 



p. 390, pi. 24, fig. 15 a~c. 

 Hhinidictya f Borlcholmiensis Wiman, Bull. Geol. Inst. Univ. Upsala, vol. 5, pt. 2, 



No. 10, 1901, p. 180, pi. 6, figs. 1-7. 



Fig. 67.— Pachydictya bifuecata. a and 6, two fragments, X1.5; c, tangential section, X20, 



SHOWING THE DISTINCT PERISTOME, THICK WALLS, AND WIDE INTERSPACES; d, PORTION OF A TRANSVERSE 

 SECTION, X20, WITH WELL-MARKED MEDIAN TUBXJLI. LTCKHOLM LIMESTONS (F1), KeRTEL, ISLAND OP 



Dago, Esthonia. 



The Lyckholm and Borkholm limestones contain numerous exam- 

 ples of a narrow, parallel edged Pachydictya which agrees in all of its 

 characters with a common American Clinton species described by 



