158 BULXETIN 125, UNITED STATES NATIONAL MUSEUM. 



Family ADEONIDAE Jullien, 1903. 



Genus ADEONA (Lamouroux, 1816) Levinsen, 1909. 



(For description see Bulletin 106, U. S. National Museum, p. 560). 



ADEONA POROSA Canu and Bassler, 1919. 



Plate 6, figs. 22, 23. 



1919. Adeona porosa Canu and Bassler, Geology and Paleontology of the West Indies, Bryozoa, 

 Publications of the Carnegie Institution of Washington, no. 291, p. 94, pi. 6, figs. 22, 23. 



Description.— The zoarium is free, bilamellar. The zooecia are little distinct, 



very elongate, separated by a hardly visible, salient thread; the frontal is porous, 



little convex, surrounded by areolar, parietal pores of which one is larger than 



the others. The ascopore is large, orbicular, median. The apertura and peristomice 



are semilunar with the proximal border somewhat concave. The gonoecia have 



two very large symmetrical, areolar pores and irregular, oral gibbosities. The 



avicularian zooecia have their opesia arranged on the lower part of a pyriform area, 



calcified and deep. 



,, a A i f ha = 0. 12 Tova. „ ■ fl<2 = 0.60mm. 



Measurements. — Apertura-^, • „ ,„ Zooecia < , „ „„ 



^ [(a = 0.12mm. [ (2 = 0.30 mm. 



Affinities. — ^As we possess only the figured fragment the study of this species 

 is necessarily incomplete. The species is very peculiar, for there is no other one 

 provided with a porous frontal and oral gibbosities at the gonoecia. 



Occurrence. — Lower Miocene (Bowden horizon) : Cercado de Mao, Santo 

 Domingo (rare). 



Coty pes. —Cat. No. 68669, U.S.N.M. 



ADEONA HECKELI Reuss. 1847. 



Plate 24, figs. 1, 2. 



1845. Cellepora umbilicata Lonsdale, Report Corals Tertiary formation North America, Quarterly 

 Journal Geological Society, London, vol. 1, p. 507. 



1847. Cellepora heckeli, Reuss, Die fossilen Polyparien des Wiener Tertiarbeckens, Haidinger's 

 naturwissenschaftliche .\bhandlungen, vol. 2, p. 85, pi. 10, fig. 10. 



1849. Lepralia violacea .Iohnston, A History of the British Zoophytes, p. 325, pi. 57, fig. 9. 



1862. Multiporina umbilicata Gabb and Horn, Monograph of the fossil Polyzoa of the Secondary 

 and Tertiary formations of North America, Journal .-Vcademy of Natural Sciences of Phila- 

 delphia, ser. 2, vol. 5, p. 145, pi. 20, fig. 27. 



1880. Microporella violacea Hincks, History of the British Marine Polyzoa, p. 216, pi. 30, figs. 1-4. 



1889. Microporella heckeli Jelly, A synonymic catalogue of the recent marine Bryozoa, p. 184 

 (general synonymy). 



1895. Microporella {Heckelia) violacea Neviani, Briozoi fossili della Farnesina, Paleontographia 

 italica, vol. 1, p. 106, (30), pi. 5, (1), figs. 27-29. 



1900. Microporella heckeli Calvet, Contribution a I'Histoire naturelle des Bryozoaires ectoprocts 



marins, Travaux de I'lnstitut de Zoologie de l'Universit6 de Montpellier, mem. 8, pi 7 

 fig. 1; pi. 8, fig. 15. 



1901. Microporella (Heckelia) violacea Neviani, Briozoi neogenici della Calabrie, Paleontographia 



Italica, vol. 6, p. 177 (63), (local bibliography). 



1902. Microporella heckeli Calvet, Bryozoaires marins de la region de Cette, Travaux de I'lnstitut de 



Zoologie de I'Universit^ de Montpellier, vol. 2, mem. 11, p. 39. 



1902. Microporella heckeli Calvet, Bryozoaires des cotes de Corse, Travaux de I'lnstitut de Zoologie 



de I'Universitfi de Montpellier, vol 2, mem. 12, p. 20. 



1904. ^deoneitopsisumftiiicatallLRicH and Bassler, Maryland Geological Survey Miocene p 417 

 pi. 113, figs. 4, 5; pi. 114, fig. 5. '<>-•. 



