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PROCEEDINGS OP THE NATIONAL, MUSEUM 



Structure. — -The zoarial aspect is that shown in D'Orbigny's figure. 

 The siibcolonies are superposed and joined to each other by tubes of 

 greater diameter. In each of them the tubes are arranged in quin- 

 cunx. The visor is sahent and triangular. The visors are very 

 fragile; they disappear at the least weathering; then the tubes and 

 cancelli are indistinguishable and appear as polygonal tubes with 

 thickened walls of an aspect very similar to that of D'Orbigny's 

 figure (14). 



The ovicells are visible only in the protected parts of the zoarium. 

 They have the usual aspect of the ovicells in the Lichenoporidae, but 



a remarkable phenomenon is that the 

 tubes between which they are arranged 

 are grouped in radial uni- or biserial 

 lines and that on the zoarial surfaces 

 the tubes are arranged in quincunx 

 and never in lines or in fascicles with 

 adjacent tubes. 



In longitudinal sections the tubes 

 are cylindrical, with dorsal gemma- 

 tion; the cancelli are ramifications of 

 more or less length and of a diameter 

 almost equal to that of the tubes. 

 The interior spines of the cancelli, 

 although visible exteriorly, are very 

 fragile and disappear in sections. 



The subcolonies are little distinct 

 in small zoaria. 



Occurrence. — Lower Cretaceous 

 (Aptian) : Faringdon, England. 

 Plesioty pes. —Cat. No. 69910, U.S.N.M. 



Fig. 31.—Multigalea canui Gregory, 1909. 

 Longitudinal section, X 16. Lower Cre- 

 taceous (Aptian): Faringdon, England 



MULTIGALEA MARGINATA, new species 



Plate 19, figs. 7-10 



Descriytion. — The zoarium is large, cylindrical, borne upon an ex- 

 panded base. The subcolonies are orbicular, convex, bordered by a 

 smooth lamella of more or less width. The tubes are polygonal, 

 arranged in irregular quincunx, provided superiorly with a short and 

 fragile visor. The cancelli arc little distinct from the tubes. 



Affinities. — This species differs from Multigalea canui Gregory, 

 1909, in its tubular walls little thickened and in the presence of smooth 

 margins around the subcolonies. 



Occurrence. — Lower Cretaceous (Aptian) : Faringdon, England. 



Holotyjye.— Cat. No. 69911, U.S.N.M. 



