100 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



Paleonlological bibliography. 



1842. Eschara biapcrta Michelin, IconograpMe zoophytologique, p. 330, pi. 79, fig. 3. 



1859. Lcpralia biaperla Busk, Monograph Fossil Polyzoa of the Crag, PubUcations Paleontographical 

 Society, London, vol. 14, p. 47, pi. 7, fig. 5. 



1862. Replescharcllina comuta Gabb and Horn, Monograph Polyzoa Secondary and Tertiary for- 

 mations of North America, Journal Academy Natural Sciences of Pliiladelpliia, ser. 2, 

 vol. 5, p. 147, pi. 20, fig. 31. 



1875. LepraKa biaperla Manzoni, I Briozoi del pliocene antico di Castrocaro, p. 21, pi. 2, fig. 28. 



1878. Lepralia biaperla Waters, Bryozoa (Polyzoa) from the Pliocene of Bruccoli (Sicily), Transac- 



tions Manchester Geological Society, vol. 14, p. 13, fig. 8. 



1879. Lepralia biaperla Seguenza, Le formazioni terziarie nella Provincia di Reggio (Calabria), 



Reale Accademia dei Lincei, Memorie della Classe di Scienze Fisiche, Matematiche e 

 Naturali, ser. 3, vol. 6, jp. 81, 202. 



1887. Lepralia biapcrta Waters, On Tertiary Bryozoa from New Zealand, Quarterly Journal Geo- 

 logical Society, London, vol. 43, p. 65. 



1895. Sddzoporella biaperla MacGillivray, Monograph Tertiary Polyzoa of Victoria, Transactions 

 Royal Society of Victoria, vol. 4, p. 85, pi. 11, fig. 20. 



1895. Schizoporella biaperla Neviani, Briozoi fossili della Farnesina e Monte Mario presso Roma, 



Paleontographica Italica, vol. 1, p. 110 (sep. 34). 



1896. Schizoporella biaperla Neviani, Briozoi Postpliocenici di Spilinga (Calabria), Atti Accademia 



Gioenia di Scienze Naturali in Catania, ser. 4, vol. 9, p. 33, fig. 16. 

 1896-1898. Schizoporella biaperla Neviani, Briozoi neozoid di alcune localita d'ltalia, Bollettino 

 della Socicta Romana per gli Studi Zoologica, pt. 3, p. Ill (sep. 10); pt. 5, pp. 4, 7. 



1897. Schizoporella biaperla Neviani, Corallari e Briozoi neogenici di Sardigna, Bolletino della 



Societa Geologica Italiana, vol. 15, p. 588 (sep. 20). 

 1901. Schizoporella biaperla Neviani, Briozoi neogenici della Calabrie Paleontographia Italiana, 



vol. 6, p. 195 (sep. 8) (regional bibliography). 

 1905. Schizoporella biaperla Neviani, Briozoi fossili di Carrubare (Calabria), Bollettino Societa 



Geologica Italiana, vol. 23, p. 532 (sep. 30). 



1919. Stephanosella biaperla Canu and Bassler, Geology and Paleontology of the West Indies, 



Paleontology, Publications Carnegie Institution of Washington, no. 292, p. 91, pt. 1, 

 figs. 16-18. 



1920. Stephanosella biaperla Canu and Bassler, North American Early Tertiary Bryozoa, Bull. 



106, U. S. National Museum, p. 344. 



^ . , (7ia = 0.10 mm. „ . lLz = OAO ima. 



Measurements. — Apertura , „ ,^ _ ,„ Zooecia 7 r> or> 



^ |Za =0.10-0.12 mm. [ te = 0.30 mm. 



Variations. — This species is quite variable in its external aspects and in its 

 micrometric measurements. The ovicelled zooecia are oriented in all directions; 

 this absolutely inexplicable phenomenon characterizes this species and contributes 

 much to making it often absolutely unrecognizable. 



We give figures of specimens chosen from different formations which will suffice 

 to enable the reader to avoid errors of determination. The specimens with large 

 tremopores should possibly be separated as a variety, in which case Gabb and 

 Horn's name of comuta would be available. This is one of the few species common 

 to both the Atlantic and Pacific. 



Occurrence. — Miocene (Bowden marl): Bowden, Jamaica (rare). Miocene 

 (Duplin marl): Wilmington, North Carolina (rare). Pleistocene: Los Angeles 

 (rare). Dead Mans Island off San Pedro (very rare), and Santa Monica, California 

 (rare); Vero, Florida (rare). 



Geological distribution. — Miocene of Australia (MacGillivray); Helvetian of 

 France (Michelin), of Sardinia (Neviani), and Italy (Seguenza) ; Zanclean of Italy 

 (Seguenza, DeStefani); Sahelian of Oran (Collection Canu); Plaisancian of England 



