44 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67 



CARDIOECIA FARINGDONENSIS, new species 



Plate 3, figs. 9-15 



Description. — The zoarium is free, cylindrical or compressed, with, 

 bifurcated fronds. The tubes are short, visible, convex, separated 

 by a little developed furrow; the peristomes are obicular, salient, 

 thick, arranged in quincunx or in close verticells. The zone of 

 growth is broad or conical. The ovicell is cordiform, little salient, 

 smooth; the oeciostome is salient, small, orbicular. The base is a 

 little expanded. 



Measurements. — Diameter of orifice, 0.14 mm.; diameter of peri- 

 stomes, 0.28 mm.; distance of peristomes, 0.48-0.60 mm.; separa- 

 tion of peristomes, 0.80 mm. 



Structure. — In longitudinal section the tubes are long, club-shaped, 

 with moniliform walls, much expanded in their terminal portion; 

 they appear closed by pseudofacettes on account of the closeness of 

 the peristomes. The gemmation is triparietal on a median lamella. 



In transverse section the tubes are round, increasing in size toward 

 the periphery, separated by the vesicular tissue of the thickened 

 walls. The median lamella is not always rectilinear. 



In meridian sections the tubes are lozenge-shaped in the axis of 

 the median lamella, which does not entirely traverse the zoarium ; 

 the lateral tubes have the normal form. 



Affinities. — This beautiful species has the exterior aspect of Car- 

 dioecia neocomiensis D'Orbigny, 1853, but it differs in its larger 

 micrometric dimensions in its fronds being much less expanded and 

 more frequently cylindrical. 



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

 (common) . 



Coty pes. —C^dt. No. 69893, U.S.N.M. 



CARDIOECIA PAUPER, new species 



Plate 5, figs. 1, 2 



Description. — The zoarium is free, cylindrical. The tubes are 

 indistinct, scarcely convex, smooth. The peristomes are arranged 

 in transverse rows or in quincunx; they are orbicular, thin, little 

 salient. The zone of growth is an elevated cone. The oviceU is 

 small, elliptical, transverse, little convex, smooth. 



Measurements. — Diameter of aperture, 0.14 mm.; diameter of 

 peristome, 0.18 mm.; distance of peristomes, 0.48-0.56 mm.; sepa- 

 ration of peristomes, 0.64 mm.; diameter of zoarium, 3 mm. 



Affinities. — We figure the two sides of the same specimen in order 

 to show that the peristomes are arranged in transverse rows on one 



