556 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



operate for we can not see the multitude of small pores which per- 

 forate the thin test of the tubuliporoid species. The difficulty of 

 oxygenation is very probably the cause of the decadence of all the 

 Cyclostomata with thick carapace. 

 Occurrence. — 



D. 5235. Nagubat Island, east coast of Mindanao; 9° 43' N.; 



125° 48' 15" E.; 44 fathoms; sft. M. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" E.; 



57 fathoms; Sh. 

 Atlantic: Teneriffe, Canary Islands, 30° N. (D'Orbigny). 

 Gulf of Mexico, Havana, 270 fathoms, 23° N. (Smitt). 

 Plesiotypes— Cat. Nos. 8408, 8409, U.S.N.M. 



Family LICHENOPORIDAE Smitt, 1866 



Genus LICHENOPORA Defrance, 1823 



LICHENOPORA RADIATA Savigny-Audouin, 1826 



Plate 88, figs. 1-6 



1826. Melobesia radiata Atjdouin, Explication sommaire des planches de polypes 



de Savigny, Description de l'Egypte, vol. 1, p. 235, pi. 6, fig. 3 (ovicell). 

 1847. Defrancia prolifera Reuss, Die fossilen Polyparien des Wiener Tertiar- 



beckens, Haidinger's Naturwissenschaftliche Abhandlungen, vol. 4, 



p. 37, pi. 6, fig. 1. 

 1877. Defrancia prolifera Manzoni, Briozoi fossile del Miocene d'Austria ed 



Ungheria, Denkschriften der k. Akademie der Wissenshaften, Wien, 



vol. 38, p. 17, pi. 15, fig. 58. 



1895. Lichenopora prolifera Neviani, Briozoi fossili della Farnesina, Paleonto- 



graphica Italica, vol. 1, p. 135. 



1896. Lichenopora prolifera Neviani, Briozoi Postpliocenici di Spilinga (Cal- 



abria), Atti Accademia Gioenia di Scienze Naturali in Catania, 



ser. 4, vol. 9, p. 65. 

 1898. Lichenopora prolifera Neviani, Briozoi neozoici d'alcune localita d'ltalia, 



Bull, della Societa Romona pu gli Studi Zoologici, vol. 4, p. 49. 

 1898. Lichenopora prolifera Neviani, Briozoi della formazione plioceniche di 



Palo, Anzio e Nettuno. Boll. Soc. Geol. Ital., vol. 17, p. 331. 

 1900. Lichenopora prolifera Neviani, Briozoi neogenici delle Calabrie, p. 24. 

 1912. Lichenopora radiata Barroso, Briozoos de la estaci6n de Biologia mari- 



tima de Santander, Trabajos del museo de cisncias naturales, No. 5, 



p. 60. 

 1917. Lichenopora radiata Okada, A report on the Cyclostomatous Bryozoa of 



Japan, Annotationes zoologicae Japonensis, vol. 9, p. 335. 



Variations. — This beautiful species is very easily recognized, as it 

 is bordered by a wide basal lamella radiatcly striated but very 

 fragile, which disappears rapidly after the death of the colony. 

 The fascicles are salient, very regular, they measure most often 

 0.10 mm. in width, but on the large specimens this width can be from 

 0.15 mm. to 0.17 mm. The size and aspect of the central cancelli 

 vary with the locality. They are covered by a porous ovicell. The 



