36 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.69 



Porellina D'Orbigny, 1851, Bry. Cret., p. 476. First species, Eschara nuwro- 

 cheila Reuss, 1848. Foss. Poly, des Wiener, pi. 8, fig. 14 { = Um1)onula) 

 Second species, Eschara coscinophora Reuss, Idem, pi. 8, fig. 20 {=Adeonel- 

 lopsis). Not recognized. 



Poricella Canu, 1904 (subgenus of Adeonellopsis) . Family Adeonidae. 



Poricellaria D'Orbigny, 1852. Not figured. Synonym of Diplodidymia. 



Porina D'Orbigny, 1852. Bry. Cret., p. 432. First species Eschara filograna 

 Goldfuss, 1826. Genus reserved for incompletely studied fossil species, 

 having a pore below the aperture. Lang erroneously chose Eschara gra- 

 cilis Lamarck, 1816 as the genelectotype, as this species belongs to Acro- 

 pora Reuss, 1869, vphere Pergens correctly placed it in 1889. 



Porinula Levinsen, 1916. Synonym of Cylindroporella. 



Poristoma Canu, 1907. Synonym of Bracebridgia. 



Posterula JuUien, 1905. Family Stomachetosellidae. 



Prattia D'Archiac, 1847. Family Mamilloporidae. 



Prodromopora Lang, 1916. Family Lagynoporidae. Cretaceous cribrimorph. 



ProsoporeUa Marsson, 1887. Pal. Abh., vol. 4, p. 100. Type and only species, 

 Semiescharipora cornuta Beissel, 1865. Synonym of Decurtaria Jullien, 

 1886. Cretaceous. 



Prosotopora Lang, 1916. Family Rhacheoporidae. Cretaceous cribrimorph. 



Prostomaria MacGillivray, 1895. Fossil. Not recognized without more study. 

 Family Prostomariidae MacGillivray, 1895. 



Pseudoflustra Bidenkap, 1897. Family Escharellidae. 



Pseudostega Brydone, 1918. Family Biflustridae. 



Psileschara Busk, 1860. Family Reteporidae. 



Psilopsella, new genus. Family Phylactellidae. 



Pterocella Levinsen, 1909. Family Catenicellidae. 



PuelUna Jullien, 1886. Family Costulae. 



Punviscaria Gabb and Horn, 1862. Jour. Acad. Nat. Sci. Phila., ser. 2, vol. 5, 

 1862, p. 179. Genotype, "Alveolites glomeratus " Say. Not recognizable. 



Pyriflustrella D'Orbigny, 1853. Bry. Cret., p. 569. First species Hippothoa 

 tiiberculum Lonsdale, 1845. Not recognized. Founded on poor interpreta- 

 tion of Lonsdale's figure. 



Pyriflustrina D'Orbigny, 1853. Bry. Cret., p. 580. Type species, P. elegana 

 D'Orbigny, 1853. Cretaceous. 



Pyripora D'Orbigny, 1852. Family Electrinidae. 



Pyriporella Canu, 1911. Family Alderinidae. Cretaceous. 



Pyrulella Harmer, 1926. Family Alderinidae. 



Quadricellaria D'Orbigny, 1851. Family Biflustridae. 



Quadricellaria Sars, 1863 (preoccupied). Synonym of Tessaradoma. 



Ragionula, new genus. Family Stomachetosellidae. 



Ramphonotus Norman, 1894. Family Alderinidae. 



Rectonychocella Canu and Bassler, 1917. Family Oi>esiulidae. 



Reginella Jullien, 1886. Type, CribriUna furcata Hincks, 1882. Family 

 Costulae. 



Reptadeonella Busk, 1884. Genotype, R. violacea (Johnston). Synonym of 

 Adeona. 



Reptelectrina D'Orbigny, 1852. Bry. Cret., p. 333. Synonym of Electra. 



Reptescharella D'Orbigny, 1852. Bry. Cret., p. 464. First .species described and 

 figured, R. {Escharina) lorieri D'Orbigny, 1852. Cretaceous cribrimorph. 



Reptescharellina D'Orbigny, 1852. Bry. Cret., p. 451. Selected genotype, 

 R. horrida D'Orbigny, 1852. Idem, p. 456, pi. 715, figs. 7-9. Cretaceous. 



Rept eschar inella D'Orbigny, 1852. Bry. Cret., p. 429. Genotype selected by 

 Lang Cellepora subgranulata Hagenow, 1851. Cretaceous. 



