WORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 93 



1903. Hippoihoa hyalina Norman, Notes on the Natural History of East Finnmark, Annals Magazine 



Natural History, ser. 7, vol. 12, Polyzoa, p. 108. 



1904. Schizoporella hyalina Calvet, Bryozoen, Ergebnisse der Hamberger Magalhaensiche Sammel- 



reise, p. 25. 



1905. Hippothoa hyalina Nordqaard, Hydrographical and biological investigations in Norwegian 



fiords, Bergen Museum, p. 165. 



1906. Hippothoa hyalina Waters, Br\'ozoa from Chatham Island and d'Urville Island, New Zealand. 



Annals Magazine Natural History, ser. 7, vol. 17, p. 19. 



1906. Celleporella hyalina Nordgaard, Die Bryozoen des westlichen Norwegena, Bergen Musuem 



Meeres-fauna von Bergen, p. 87. 



1907. Schizoporella hyalina Calvet, Bryozoaires, Expedition scientifiques Travailleur et Talisman, 



p. 415. 



1907. Hippothoa hyalina Nordgaard, Campagne arctique de 1907 de Due D'Orleans. Bryozo- 



aires, p. 9. 



1908. Schizoporella hyalina Robertson, Incrusting Cheilostomatous Br>-ozoa of the West Coast 



of North America, University of California Publications, Zoology, vol. 4, No. 5, p. 289, 

 pi. 19, fig. 43-45 (not synonomy). 



1911. Schizoporella hyalina Guerin-Ganivet, Contributions a I'^tude des Bryozoaires des cotes 



Armoricaines, II, Bryozoaires provenant de la rade de Bres£, Travaux du Laboratoire de 

 Zoologie de Concarneau, vol. 3, p. 2. 



1912. Hippothoa hyalina Osburn, The Bryozoa of the Woods Hole Region, Bulletin Bureau Fisheries, 



vol. 30, 1910, p. 235, pi. 24, fig. 47 (American bibliography). 

 1912. Hippothoa hyalina Nordgaard, Revision av norske Bryozoer, Kgl. norske Videnskabers 

 Selskabs Skriften, 1911, no. 3, p. 20. 



1912. Schizoporella hyalina Guerin-Ganivet, Contributions a I'^tude des Brj-ozoaires des cotes 



Armoricaines, III, Brj'ozoaires de la region de Concarneau, Travaux scientifiques du 

 Laboratoire de Zoologie de Concarneau, vol. 4, p. 14. 

 19i2. Schizoporella hyalina Barroso, Briozoos de la estacion maritima de Santander, Trabajos del 

 Museo de ciencias naturales, no. 5, p. 16. 



1913. Schizoporella hyalina Guerin-Ganivet, Bryozoaires de la Mission arctique, Society d'oceano- 



graphique de Golfe de Gascogne, fasc. 7, p. 26. 



A number of varieties of tliis widespread recent and fossil species have been 

 described. Their present day arrangement is as follows: 



Variety hougainvillei D'Orbigny, 1839, is a distinct species. 

 Variety discreta Buslv, 1852, is Diazeuxia reticularis Jullien, 1888. 

 Variety muricata Busk, 1852, is Diazeuxia Icerguelenensis Jullien, 1888. 

 Variety cornuta Hincks, 1880, from Australia belongs to another genus. 

 Variety cornuta Hincks, 1880, from Natal is another species. 

 Variety from Santa Cruz (Hincks, 1880) is a distinct species. 

 Variety from Australia (MacGillivray) is a distinct species. 



Measurements. — Ordinary zooecia: Apertura , „' „ 



•^ I ia = 0.10 mm. 



rj . [1,2 = 0.40 mm. 

 Zooecia , . , , 



[ te = 0.14 mm. 



^ . „ , . , ^ fAa = 0.06mni. 



Ovicelled zooecia: Apertura 



Zooecia 



Za = 0.08 mm. 



f is = 0.40 mm. 



Z0 = O.2O mm. 



,, , . A i. { ha = 0.0i nma. 



Male zooecia : Apertura , „ „ . 



^ \ la = 0.04 mm. 



Zooecia' 



i2 = 0.24 mm. 

 Z2 = 0.12 mm. 



