100 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Deceived by an erroneous observation of Levinsen, 1909, we have 

 classed the Corbula group of Waters, 1898 in Hincksina. It is neces- 

 sary to make a special genus since Harmer has observed that the 

 ovicell is hyperstomial. All the fossil species which we described in 

 1920 are correctly classified; two species only which did not show 

 the ovicell belonging perhaps to the new genus. 



The recent species which must be classed in this genus with cer- 

 tainty from the appearance of the figures are as follows: 



Pyrulella (M embranipora) pyrula Hincks, 1881. 

 Pyrulella {Membranipora) corbula Hincks, 1881. 

 Pyrulella (M embranipora) maderensis Waters, 1898. 

 Pyrulella (M embranipora) sceletos Busk, 1858. 

 Pyrulella (M embranipora) corniculifera Hincks, 1882. 



PYRULELLA PYRULA Hincks, 1881, variety 



Plate 5, fig. 11 



1879. Membranipora lineata MacGillivray, Prodrome Zoology Victoria, dec. 3, 



p. 34, pi. 26, fig. 3. 

 1881. Membranipora pyrula Hincks, Polyzoa from Bass Straits, Annals and 



Magazine Natural History, ser. 5, vol. 8, p. 51 (sep) pi. 1, fig. 2. 



1886. Membranipora pyrula MacGillivray, Prodrome Zoology Victoria, dec. 13, 



p. 103, pi. 127, fig. 1. 



1887. Membranipora pyrula MacGillivray, Catalogue of the Marine Polyzoa 



of Victoria, p. 20. 

 1889. Membranipora pyrula Waters, Bryozoa from New South Wales, Annals 



and Magazine Natural History, ser. 6, vol. 4, p. 3. 

 1889. Membranipora pyrula Jelly, Synonymic Catalogue of Marine Polyzoa, 



p. 162. 

 1898. Membranipora pyrula Waters, Observations on Membraniporae, Linnean 



Society's Journal, vol. 26, p. 665, pi. 49, fig. 13. 

 1908. Membranipora pyrula Canu, Iconographie des Bryozoaires fossils de 



1' Argentine, Anales des Museo de Buenos Aires, vol. 17, p. 257, pi. 1, 



fig. 10. 



Measurements. — 



n • f^o = 0.30-0.35 mm. ~ • jLz = 0.50-0.55 mm. 



Opesium 7 nnn nnn Zooecium 7 „ „ 



(lo = 0.20-0.22 mm. \lz = 0.40 mm. 



Our specimen was dead; it incrusted a fragment of shell. 



We have classed the specimen figured in Pyrulella pyrula because 

 of the large spines, but in the form of the cells it is closer to P. corbula 

 Hincks, 1881. The publication of this figure moreover is to recog- 

 nize Harmer's genus and to indicate its presence in the Philippines. 



Occurrence. — D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 

 15" N.; 119° 09' 52" E.; 175 fathoms; fine S, co.; 13° C. 



Geological distribution. — Patagonian of Argentina ''Canu). 



Habitat. — Pacific, Australia. 



Plesiotype.—Csit. No. 7863, U.S.N.M. 



