NORTH AMERICAN L.\TER TERTIARY AND QUATERNARY BRYOZOA. 23 



1911. Manbranipora tehuelca Guerin-Ganivet, Contributions a I'etude des Bryozoaires des cotes 



Armoricaines II, Bryozoaires provenant de la rade de Brest, et recueilles par les freres 

 Crouan, Travaux scientifiques du Laboratoire de Zoologie de Concarneau, vol. 3, fasc. 5, 

 p. 6, fig. 3. 



1912. Membmnipora tehuelca Osburn, The Bryozoa of the Woods Hole Region, Bulletin Bureau 



Fisheries, vol. 30, 1910, p. 231, pi. 24, fig. 40. 



We agree with Norman that this species is indeed that of Bosc, who indicated 

 it as very abundant on the algae of the Sargossa Sea. These algae, swept along by 

 the eciuatorial current, have transported to America a considerable number of 

 European species. This particular one has made the tour of America. One of our 

 fossil specimens still retains its ectocyst and its corneous opercular valve. 



Occurrence. — Pleistocene: Santa Monica (Rustic Canyon), California (rare). 



Halitat. — Eastern Atlantic off France, Senegal, Madeira, and Angola. Western 

 Atlantic: United States, Chagos Isles, Pernambuco, Rio Janeiro, Patagonia. 

 Pacific : Kursachee and California. 



Plesiotype.~Cat. No. 68406, U.S.N.M. 



MEMBBANIPORA VAUGHANI Canu and Bassler, 1919. 



Plate 2, fig. 1. 



1919. Membranipora vaughani Canu and Bassler, Geology and paleontology of the West Indies, 

 Bryozoa, Publications of the Carnegie Institution of Washington, no. 291, p. 77, pi. 2, fig. 1. 



Description. — The zoarium incrusts shells. The zooecia are little distinct, 

 united among themselves by their mural rim, elongated, hexagonal; the mural 

 rim is flat, granular, everywhere of equal width. The opesium is elliptical or oval, 

 finely crenulated. Between the zooecia at the angles of junction large rounded 

 tubercles occur. 



^ . (^0 = 0.32 -0.36 mm. „ . fi2 = 0.40- 0.44 mm. 



Measurements.-Oj,esm>^ ^^ ^ ^ 22 - 0.24 mm. Zooecia^ ^^ ^ ^ 3^ ^^^^ 



Affinities. — A single specimen has been found and its zooecia are somewhat 

 deformed by the substratum. The species differs from Membranipora tubercuJata 

 Busk, 1859, from the Enghsh Crag in its much larger micrometric measurements. 

 It differs from Membranipora tuberculata Bosc, 1802 (not Busk, 1859) in the much 

 more reduced and very different form of its interzooecial tuberosites. 



Occurrence. — Lower Miocene (Bowden horizon) : Cercado de Mao, Santo Domingo 

 (very rare). 



Holotype.— Cat. No. 68407, U.S.N.M. 



MEMBRANIPORA (7) TUBERIMARGO. new species. 



Plate 9, fig. 12. 



Description. — The zoarium incrusts shells. The zooecia are distinct, separated 

 by a deep furrow, elongated, elliptical. The mural rim i§ thin, rounded, a httle 

 enlarged at the base; it bears one pair of distal and two pairs of lateral tuberosities. 

 The opesium is large, anterior, elliptical. 



^ . fAo = 0.40 -0.45 mm. „ . (is = 0.45 mm. 



Measurements.-Opesm^ ^^ ^ ^ 25 - 0.30 mm. ^ooecia| ^, ^ ^^ 3 . _ ^^^ ^^^^ 



