NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 117 



Geological distrihution. — 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, CaUfornia (32-48 meters). Southern Pacific: Tahiti, Australia (5-13 

 meters) , New Zealand. Western Pacific : Japan, Cape Tizard (China Sea) (44 meters) , 

 Indian Ocean, Red Sea. Antartic Ocean: Cape Horn (5-300 meters), Malouines 

 Islands, Terra del Fuego. 



Plesioty^es.— Cat. No. 68582, 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. 



,, . 1 , fA,a = 0.13 mm. „ . fL2 = 0.65mm. 



Measurements. — Apertura , _ „„ Zooecia , n t^n n aa „ 



^ [ id = 0.26 mm. [ 42 = 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 Hincks, On British Polyzoa, Annals Magazine Natural History, ser. 4, vol. 20, 

 p. 526. 



The operculum closes the ovicell and is semicUiptical. The frontal is an 

 ordinary tremocyst. Avicularia are present. Thirteen to fourteen tentacles. 



Genotype. — Microporella {Eschara) ciliata Linnaeus, 1759. 



Range . — ^Miocene-Recent . 



Under this weU-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, eUiptical apertura. 



