82 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
Canu), of Provence (Canu); Sicilian of Italy (Neviani); Quaternary of Italy (Segu- 
enza), of Argentina (Canu). 
Habitat. —Mediterranean; Atlantic, Canary Islands, and Florida. It is com¬ 
mon in the Gulf of Gascony in the Miocene, but it has now disappeared from this 
region. The species has been dredged at a depth of 11 to 48 meters in America and 
from 81 to 113 meters at Madeira. 
Plesiotypes. —Cat. Nos. 68506-68511, U.S.N.M. 
CUPULARIA ROBERTSONIAE, new species. 
Plate 34, figs. 5-7. 
1908. Cupularia canariensis Robertson, The incrusting Cheilostomatous Bryozoa of the West 
Coast of North America, University of California Publications 11, Zoology, vol. 4, no. 5, 
p. 314, pi. 24, figs. 90, 91. 
Description.— The zoarium is discoid, little convex. The zooecia are distinct, 
much elongated, lozenge shaped; their mural rim is thin, sharp. The cryptocyst is 
deep, flat, perforated in the middle -by some irregular pores and laterally by seven 
large opesiules; the opesium is ogival, transverse, with a proximal concave border. 
The vibraculum is large, salient, auriform and provided with a very large opesium. 
Measurements. —Apertura 
Aa = 0.10 mm. 
la =0.15 mm. 
Zooecia* 
'Lz = 0.60 mm. 
Iz =0.30-0.35 mm. 
Affinities. —The few fossil fragments in our collections appear to agree with 
Cupularia canariensis Robertson, 1908, dredged in the Pacific off the shores of 
California. This species is very close to Cupularia umbellata Defrance, 1828; but 
differs in its larger and less numerous opesiules and in its smaller zoarium. It 
differs from Cupularia reussiana Manzoni, 1869, in its more numerous and smaller 
opesiules and in its flatter zoarium. 
Occurrence. —Pleistocene: Santa Monica (Long Wharf Canyon), California 
(rare). 
Habitat. —Pacific, off San Pedro (6 meters) and island of Santa Catalina, 
California. 
Cotypes. —Cat. No. 68512, U.S.N.M. 
Genus CALPENSIA Jullien, 1888. 
1888. Calpensia Jullien, Mission scientifique du Cap Horn, VI, Zoologie, Bryozoaires, p. 78. 
The cryptocyst is entirely developed; it bears two distinct secondary opesia 
[opesiules]. The operculum is semilunar. (After Jullien.) 
The opesiular outgrowths join the lateral walls, forming a closed hollow on each 
side. A simple, feebly chitinized operculum. Numerous pores, but no spines. 
No ovicell. No avicularia. The distal wall consists of a basal horizontal and a 
frontal ascending part, the former being furnished with a narrow transverse group 
of small uniporous rosette plates [ = septulae]. The distal half of each distal wall 
with a single multiporous plate. (Levinsen.) 
Genotype.—Calpensia ( Flustra ) impressa Moll, 1803. Range: Auversian, 
Recent. 
