NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 117 
Geological distribution. —Burdigalian of Catalogne (De Angelis); Patagonian 
of Argentina (Canu); Miocene of Australia (MacGillivray) and New Zealand (Waters); 
Plaisancian of England (Busk) and of Italy (Manzoni); Astian of Italy (Seguenza); 
Sicilian *of Italy (Seguenza, Neviani); Quaternary of Italy (Seguenza, Neviani). 
Habitat. —Arctic Ocean: Finmark (16-48 meters). North Sea: Norway, Den¬ 
mark (29-45 meters), England. Eastern Atlantic: England, English Channel, 
Gulf of Gascony (10-180 meters), Madeira. Mediterranean: Cette, Corse, Naples, 
Oran. Adriatic (32-89 meters). Southern Atlantic: Tristan da Cunha (228-243 
meters), Falkland Islands (8-34 meters). Eastern Pacific: Queen Charlotte 
Islands, California (32-48 meters). Southern Pacific: Tahiti, Australia (5-13 
meters), New Zealand. Western Pacific: Japan, Cape Tizard (China Sea) (44meters), 
Indian Ocean, Red Sea. Antartic Ocean: Cape Horn (5-300 meters), Malouines 
Islands, Terra del Fuego. 
Plesiotypes. —Cat. No. 685S2, U.S.N.M. 
FENESTRULINA POROSA, new species. 
. Plate 37, fig. 4. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, very little elongated; the surface is convex, very porous and 
perforated in its middle portion by a crescentric ascopore. The apertura is semi¬ 
lunar, transverse, surrounded by a little salient, very thin peristome. The ovicell 
is globular, covered with scarcely visible tuberosities and surrounded by a salient 
ring. 
Measurements. —Apertura 
ha = 0.13 mm. 
la = 0.26 mm. 
Zooecia- 
Lz = 0.65 mm. 
Iz = 0.50—0.65 mm. 
Affinities. —The peristome frequently bears two spines. The frontal is often 
covered with a double pellicule. 
This species is very close to Fenestrulina malusi, but differs from it in its greater 
number of frontal pores and in its triple instead of double rows of pores present 
between the aperture and the ascopore. 
Occurrence. —Pleistocene: Santa Monica (Long Wharf Canyon), California 
(rare). 
Holotype. —Cat. No. 68583, U.S.N.M. 
Genus MICROPORELLA Hincks, 1877. 
1877. Microporella PIincks, On British Polyzoa, Annals Magazine Natural History, ser. 4, vol. 20, 
p. 526. 
The operculum closes the ovicell and is semielliptical. The frontal is an 
ordinary tremocyst. Avicularia are present. Thirteen to fourteen tentacles. 
Genotype .— Microporella ( Eschara) ciliata Linnaeus, 1759. 
Range. —Miocene-Recent. 
Under this well-known genus we recognize three subgenera, as follows: 
Diporula Hincks, 1879, characterized by a horseshoe-shaped orifice, slightly 
contracted by two lateral projections. 
Ellipsopora, new subgenus, characterized by a transverse, elliptical apertura. 
