EAELY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 



123 



the beautiful surface character of the zooecia, forms one of the pret- 

 tiest species in the Baltic Ordovician. The specific name is in honor 

 of Dr. J. H. Bonnema, of The Hague, Holland, in appreciation of his 

 excellent work upon the Ostracoda of the Kuckers formation. 



Occurrence. — A common fossil in the Kuckers shale (C2), Baron 

 Toll's estate, Esthonia. Specimens referred to the species occur also 



Fig. 48. — Geaptodictya bonnemai. a, portion of a zoabium, natural size, showing the pointed 



BASE AND FREQUENCY OF BRANCHING; 6, TANGENTIAL SECTION, X20, CUTTING BOTH MATURE AND IMMA- 

 TURE regions; C and d, several ZOCECIA of the same, X40, with one still FURTHER ENLARGED, 



X60; e, vertical section, x20, illustrating the prominent superior hemiseptum. Kuckers 

 SHALE (C2), Baron Toll's estate, Esthonia. 



in the Jewe limestone (Dl), Baron Toll's estate, and in the Wesen- 

 berg limestone (E) at Wesenberg, Esthonia. 



Coupes.— Cat. No. 57213, U.S.N.M. 



Specimens from the Kuckers shale (C2), Baron Toll's estate, are in 

 the collections of the British Museum. 



GRAPTODICTY.'V PROAVA (Eichwald). 

 Plate 8, fig. 2; plate 9, figs. 1-6; text figa. 49, 50. 



Gorgonia proavus Eichwald, Urwelt Russlands, vol. 2, p. 44, pi. 1, fig. 5. 

 Coscinium proavus Eichwald, Lethsea Rossica, vol. 1, 1860, p. 398. 

 Stictoporella cribrosa Sardeson (not Ulrich), Journ. GeoL, vol. 9, 1901, p. 157, 



pi. B, figs. 7-9. 

 Clathropora flabellata Hall, Foster and Whitney's Rep. Geol. Lake Superior Land 



District, pt. 2, 1851, p. 207, pi. 24, figs. 2a, h. 

 Stictoporella flabellata Nickles and Bassler, Bull. 173, U. S. Geol. Surv., 1900, 



p. 416. 

 f Coscinium proavium Billings, Geol. Canada, Geol. Surv. Canada, 1863, p. 158, 



fig. 122. 



This splendid species, with its large, cribrose zoarium and con- 

 spicuously striated, pointed base, furnishes probably the most showy 

 cabinet specimen of any of the Russian bryozoans. Fragments are 

 abundant in the Wassalem beds (D3) at several localities in Esthonia, 



92602°— Bull. 77—11 10 



