116 



BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



1908. Mir.mpnrfMa malusi Robertson, The incrusting cheilostomatous Bryozoa of the west coast 



of North America, University of California Publications, Zoology, vol. 4, no. 5, p. 282, 

 pi. 18, figs. 3.5, 36. 



1909. Fenestndina malusi Norm.\n, The Polyzoa of Madeira, .Tournal Linnean Society, Zoology, 



vol. 30, p. 297. 



1910. Microporella malusi Water.s, Reports on the marine biology of the Sudanese Red Sea, Journal 



Linnean Society of London, Zoology, vol. 32, p. 168. 

 1912. Microporella malusi Barroso, Briozoos de la estacion maritima de Santander, Trabajos del 

 Museo de ciencias naturales, no. 5, p. 27. 



It is remarkable that this very cosmopoUtan species has never been observed 



in the western Atlantic, fossil as well as recent. 



,, , , . f/ta = 0.08-0. 10mm. „ . fXz = 0.50mm. 



Measurements. — Apertura , - ,„ „ ,„ Zooecia , - „^ ■ 



^ lto = 0.16-0.18 mm. [(2 = 0.36 mm. 



Occurrence. — Pleistocene: Santa Barbara (common), and Dead Mans Island, 



off San Pedro, California (very rare). * 



Fig. 19.— Genus Fenestrulina Jullien, 1888. 



A-J. FeneslruliTM malusi Savigny Audouin, 1826. A. A zooecium X 50 showing all the Gbaracters. 

 B, C. Stellate frontal pores, X 250. (A-C, after Waters, 1903.) D. Portion of surface of a zooecium, 

 X 175. E. Aperture, X 100. (After Levinsen, 1909.) F. Detailed structure of the ascopore (fenes- 

 trule of Julhen) X 175. G. Dorsal face of the zooecia, showing the dietellae X 18. H. Zooecia X 21, 

 several showing the ovicell. (D, F-H, after Levinsen, 1894.) I. Ancestrula and ancestrular zooecia, 

 X 2o. J. Ancestrula. The frontal membrane is typically Flustrine, its calcareous margin bearing 

 ten spines, of which three are oral spines; op, operculum; 6. 6., brown body;/, m., frontal membrane 

 (=ectocyst). (After Harmer, 1902.) 



K. Operculum, X 85. (After Waters, 1877.) L. Fenestrulina parvipora Waters, 1903. Oper- 

 culum, X 85. M. Fenestrulina proxima Waters, 1903. Operculum, X 85. (I, L, M, after Waters, 



