40 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67 



Structitre. — Although very beautiful, D'Orbigny's figure is not com- 

 plete. A considerable number of tubes bear at their base large trans- 

 verse wrinkles. They are not constant, it is true; when the tubes 

 are very long and are inserted between two peristomes (distance of 

 1.20 mm.), the wrinkles are quite visible in the inferior nonsalient 

 portion; when the tubes are short (distance, 0.70 mm.), the wrinkles 

 have disappeared. 



We have not observed the ovicell, but we classify the species 

 provisionally in the genus Trigonoecia because the sections are identi- 

 cal with those of other species of the genus. The fronds being un- 

 dulated, there is never perfect symmetry in the sections. Pergens 

 and Gregory have erroneously identified this species with Diastopora 

 compressa Goldfuss, 1827, in which the micrometric measurments are 

 much smaller. 



Occurrence. — Lower Cretaceous: Sainte-Croix, Switzerland (Val- 

 angian) ; Morteau (Jura), France (Urgonian). 



Plesiotype.— Cat. No. 69887, U.S.N.M. 



Genus CARDIOECIA Canu and Bassler, 1922 



The ovicell is triangular, transverse, cordiform, little convex, 

 smooth, symmetrical; the oeciostome is small, salient, median. The 

 tubes are club-shaped, with triparietal gemmation on a basal lamella. 



Genotype. — -Cardioecia (Bidiastopora) neocomiensis D'Orbigny, 1853. 

 Lower Cretaceous (Neocomian, Aptian). 



The ovicell is less salient and more expanded than in Trigonoecia. 

 The tubes are longer and club-shaped. The latter character is clearly 

 visible in transverse sections, which have a larger number of tubes 

 and increase regularly from center to circumference. We have 

 observed only the free forms of growth, but encrusting forms are 

 quite possible. The oeciostome always measures 0.10 mm. and the 

 oeciopore 0.06 mm. No exceptions to this have been found. 



CARDIOECIA NEOCOMIENSIS D'Orbigny, 1853 



Plate 2, figs. 1-7 



1853. Bidiasiopora neocomiensis D'Orbigny, Paleontologie frangaise, Terrain 



Cr^tac6, vol. 5, p. 800, pi. 784, figs. 9-11. 

 1902. Bidiastopora campicheann Canu, Bryozoaires fossiles. Collection Campich. 



Bull. Soc. Geol. France, ser. 4, vol. 2, p. 11. 



Measurements. — Diameter of aperture, 0.10 mm. ; diameter of peri- 

 stome, 0.16 mm. ; zooecial diameter, 0.20 mm. ; distance of peristomes, 

 0.40-0.50 mm.; separation of peristomes, 0.50 mm.; width of large 

 fronds, 3 mm. 



Variations. — This species is very irregular and D'Orbigny's figure 

 represents only one phase of it. In their perfect form the tubes are 

 visible and salient (fig. 2) . This character disappears easily even on 



