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.—Crepidacantha 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 basal wall. As in figure C, dietellae alternate with intermediate spaces, X 55. 
C. The distal part of a zooecium with ovicell, seen from the basal wall, X 55. D. An ancestrula of 
another variety of the same species, X 175. E. Operculum, X 140. F. The proximal part of the 
flagellum, X 200. (After Levinsen, 1909.) 
Family CELLEPORIDAE Busk, 1852. 
Genus HOLOPORELLA Waters, 1909. 
For description, see Bulletin 106, U. S. National Museum, p. 604. 
HOLOPORELLA ALBIROSTRIS Smitt, 1872. 
Plate 7, figs. 9-14; plate 32, figs. 6-10. 
1872. Discopora albirostris 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. Holoporella albirostris Osburn, Bryozoa of the Tortugas Islands, Publication 182, Carnegie 
Institution of Washington, p. 215. 
1919. Holoporella albirostris Canit 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. —Apertura, ha =0.14 mm. 
Zooecia 
Lz =0.40-0.60 mm. 
. la =0.30 mm. 
Avicularium 
'La =0.60 mm. 
la =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 
