NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
93 
1903. Hippothoa kyalina 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 Magalbaensiche Sammel- 
reise, p. 25. 
1905. Hippothoa hyalina Nordgaard, Hydrographical and biological investigations in Norwegian 
fiords, Bergen Museum, p. 165. 
1906. Hippothoa hyalina Waters, Bryozoa 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 Norwegens, 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 Bryozoa 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 1’ etude des Bryozoaires des cotes 
Armoricaines, II, Bryozoaires provenant de la rade-de Brest, Travaux du Laboratoire de 
Zoologie de Concarneau, vol. 3, p. 2. 
1912. Hippothoahyalina Osbvws, 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 Yidenskabers 
Selskabs Skriften, 1911, no. 3, p. 20. 
1912. Schizoporella hyalina Guerin-Ganivet, Contributions a l’dtude des Bryozoaires des cotes 
Armoricaines, III, Bryozoaires de la region de Concarneau, Travaux scientifiques du 
Laboratoire de Zoologie de Concarneau, vol. 4, p. 14. • 
1912. 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, Societe d’oeeano- 
graphique de Golfe de Gascogne, fasc. 7, p. 26. 
A number of varieties of this widespread recent and fossil species have been 
described. Their present day arrangement is as follows: 
Variety lougainvillei D’Orbigny, 1839, is a distinct species. 
Variety discreta Busk, 1852, is Diazeuxia reticulans 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- 
ha = 0.10 mm. 
la = 0.10 mm. 
Lz = 0A0 mm. 
Zooecia- 
Lz = 0.40 mm. 
lz = 0.20 mm. 
Male zooecia: 
