174 



BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



(a marginal pore) in its roof. Two frontal vibracula without a crossbar. The 

 hyperstomial, almost free ooecia, consist of two calcified layers, of which the 

 ectooecium is provided with a number of pores. (Levinsen.) 



Genotype. — Crepidacanfha poissoni Savigny-Audouin, 1826. Recent. 



Fig. 33. — Genus Crepidacantha Levinsen, 1909. 

 A-F. Crepidacantha poissoni, var. crinispina Levinsen, 1909. A. Two zooecia, X 55. B. A zoo- 

 ecium seen from the Ijasal waU. As in figure C. dietellae alternate with intermediate spaces, X 55. 

 C. The distal part of a zooecium with ovicell, seen from the liasal wall, X 55. D. .\n ancestrula of 

 another variety of the same species, X 175. E. Operculum, X 110. F. The proximal part of the 

 flagellum, X 200. (After Levinsen, 1909.) 



Family CELLEPORIDAE Busk, 1852. 



Genus HOLOPORELLA Waters, 1909. 



For description, see Bulletin lOd. U. S. National Museum, p. 604. 

 HOLOPORELLA ALBIROSTRIS Smitt, 1872. 



Plate 7, figs. 9-14; plate 32, figs. 6-10. 



1872. Discopora albiroslris Smitt, Floridan Bryozoa, pt. 2, Kongl. Svenska Vetenskaps-Akade- 



miens Handlingar, vol. 11, no. 4, p. 70, pi. 12, figs. 233-239. 

 1889. Cellepora albirostris Jelly, A synonymic catalogue of the Recent Miocene Bryozoa, p. 45 



(Bibliography). 

 1914. Holoporclla albiroslris Osburx, Bryozoa of the Tortugas Islands, Publication 182, Carnegie 



Institution of Washington, p. 215. 

 1919. Holoporella albirostris Canu and Bassler, Geology and Paleontology of the West Indies, 



Bryozoa, Publications of the Carnegie Institution of Washington, no. 291, p 97, pt 1, 



fig. 19, pi. 7, figs. 9-14. 



Measurements.^ApeTtura. ha =0.1i mm. 



Zooeciaf^^=0-^0-0-60°^^^- 



Avicularium' 



ia=0.60 mm. 



1^=0.30 mm. " ^"""^l Za =0.40 mm. 



Variations. —The apertura is semilunar with a concave proximal border; it is 

 indeed only constant in the interior (pi. 32, fig. 10). Exteriorly the peristomice is 



