IQ PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 



Family ESCHARELLIDAE Levinsen, 1909 

 Genus ARTHROPOMA Levinsen, 1909 



ARTHROPOMA CECILI Savigny-Audouin. 1826 



1925. Arthropoma cedli Canu and Basslek, Les Bryozotiires du Maroc et de 

 Mauritanie, Memoires de la Society des Sciences naturelles du Maroc, 

 vol. 10, p. 23. (Biology.) 



1929. Arthropoma cecili Canu and Bassler, Bryozoa of the Philippine Region, 

 Bull. 100, vol. 9, U. S. National Museum, p. 2D6, pi. 32, fig. 1. 



A single living ovicelled specimen on a Cellepore, dredged April 9, 

 1888. At La Jolla, Calif., we have observed specimens ovicelled on 

 Sept. 18, 1918. 



Occurrence. — Galapagos Islands, D. 2815. La Jolla, Calif. 



Cat. No. 8484, U.S.N.M. 



Genus SCHIZOPODRELLA Canu and Bassler, 1917 



SCHIZOPODRELLA (STEPHANOSELLA) BIAPERTA Michelin. 1842 



Plate 2, Figures 1, 2 



1923. Stephanosella tiaperta Canu and Bassler, North American Later Terti- 

 ary and Quaternary Bryozoa, Bull. 125 U. S. National Museum, p. 99, 

 pi. 16, figs. 4-9. (Bibliography, geologic and geographic distribution.) 



1925. Stephanosella Uaperta Canu and Bassler, Les Bryozoaires du Maroc et de 

 Mauritanie, M6moires de la Societe des Sciences naturelles du Maroc, 

 vol. 10, p. 30, pi. 7, fig. 5 (operculum). 



Measurertien ts. — 



[A«=0.10-0.12 mm. (2.^=0.40-0.50 mm. 



Apertura j z^=o.08-0.10 mm. Zooecmm | ^^=o.34 mm. 



A-fJinities. — The small oral avicularia are triangular and the trem- 

 opores are rather large. These are the noticeable differences from the 

 European specimens. The ovicelled zooecia are also much better 

 oriented, but they have the same cribriform 

 frontal area. The affinities are essentially with 

 the fossils from the California Pleistocene fig- 

 ured by Canu and Bassler, 1923 (more exactly 

 with their figures 4-8). In tangential section the 

 "■^r./lix^r tremopores appear very small. 

 ELLA) BIAPERTA Thc number of distal spines varies from 6 to 8. 

 iwo'o''pEEcuL; x'ss The operculum is the same as in typical Schizo- 

 podrella. Also as the ovicellarian area does not 

 correspond to any evident or known function there is no need to 

 maintain the genus Stephanosellco. 



The genotype itself, a fossil of the French Miocene has a smooth 

 frontal. In our mind, the specimens of the genus Stephanosella were 

 provided with a olocystal frontal, but it is indeed true that this 

 appearance is only the result of an alteration in the fossils. It is also 



