EARLY PALEOZOIC BRYOZOA OP THE BALTIC PROVINCES. 175 



Family FENESTELLIDiE King. 



But a single species of this prolific group of post-Ordovician Paleo- 

 zoic Bryozoa has been recorded from the Russian strata under study. 

 This is a species of the genus Fenestella which Eichwald has recorded 

 from the dolomitic limestone at Borkholm. In America the corre- 

 sponding strata have also afforded a single representative of the same 



genus. 



Genus FENESTELLA Lonsdale. 



Fenestella Lonsdale, Murchison's Silurian System, 1839, p. 677. — Eichwald, 

 Leth^a Rossica, vol. 1, 1860, p. 356.— Shrubsole, Quart. Journ. Geol. Soc. 

 London, vol. 37, 1881, p. 179.— Ulrich, Journ. Cincianati Soc. Nat. Hist., 

 vol. 5, 1882, p. 150.— Hall and Simpson, Nat. Hist. New York, Pal., vol. 6, 

 1887, p. xxii.— Ulrich, Geol. Surv. Illinois, vol. 8, 1890, pp. 395, 534.— 

 PocTA, Syst. Sil. Centre Boheme, vol. 8, pt. 1, 1894, p. 40.— Ulrich, Zittel's 

 Textbook Paleontology (Eng. ed.), 1896, p. 281.— Simpson, Fourteenth Ann. 

 Rep. State Geologist of New 

 York, for the year 1894, 1897, 

 p. 500. — NiCKLES and Bas- 

 SLER, Bull. 173, U. S. Geol. 

 Surv., 1900, pp. 37, 244.— 

 CoNDRA, Nebraska Geol. 

 Surv., vol. 2, pt. 1, 1903, p. 

 49. — Hennig, Archiv fur 

 - Zool., K. Sven. Vet.-Akad. 

 Stockholm, vol. 3, No. 10, 

 1906, p. 1. 



Fenestrella (error) D'Orbigny, 

 Prodr. de Pal., vol. 1, 1850, 

 p. 44. 



Actinostroma Young and Young, 

 Quart. Journ. Geol. Soc. Lon- 

 don, vol. 30, 1874, p. 681.— 

 Vine, Proc. Yorkshire Geol. 

 Polyt. Soc, vol. 9, 1885, p. 84. 



Flabelliporina Simpson, Thir- 

 teenth Ann. Rep. State Geol. 



New York for the year 1893, 1895, pp. 703, 724; Forty-seventh Ann. Rep. 

 New York State Mus., 1895, pp. 897, 918; Fourteenth Ann. Rep. State 

 Geologist New York for the year 1894, 1897, p. 521. 



Zoarium flabellate or funnel shaped, celluliferous on the inner side; 

 branches generally straight, sometimes flexuous, connected at regular 

 intervals by dissepiments; apertures in two rows, separated by a 

 plain or tuberculated median keel. 



Genotype. — Gorgonia antiqua McCoy. Accepted genotype F. pleheia 

 McCoy. Carboniferous of Europe. 



FENESTELLA STRIOLATA Eichwald. 



Text fig. 92. 

 Fenestella striolata Eichwald, Lethsea Rossica, vol. 1, 1860, p. 357, pi. 23, figs. 2a-c. 

 No specimens of this species have come to light in the collections 

 I have studied, but as Eichwald registers the species from Borkholm 



Fig. 92.— Fenestella striolata. a, zoakium, nat- 

 ural size; 6, NONPORIFEROUS SIDE ENLARGED; C, 



small portion of poriterotjs side, enlarged. 

 Early Silurlin of Baltic Russia. (After Eich- 

 wald.) 



