ART. 21 CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER 37 



Genus MICROECIA Canu, 1918 



MICROECIA CORNUCOPIA D'Orbigny, 1851 



Plate 28, figs. 5-7 



1899. Prohoscina cornucopia Gregory, Catalogue of Cretaceous Bryozoa in the 

 British Museum, vol. 1, p. 45, pi. 3, figs. 6, 9, 10; pi. 4, fig. 1. (Bibli- 

 ograph,y, geological distribution.) 



Our specimens from Faringdon found incrusting shells correspond 

 fairly well to Gregory's Figure 66. They do not exhibit the large 

 berenicoid expansions like the type specimen, but they have the 

 same small dimensions. 



A specimen from Sainte-Croix appearing to correspond to Figure 

 1, Plate 4, of Gregory, is ovicelled and belongs to the genus Microecia. 



Occvrrence. — Lower Cretaceous: Faringdon, England (Aptian), and 

 Sainte-Croix (Vaud), Switzerland (Valangian). 



Plesiotype.—C&t. No. 69882, U.S.N.M. 



Genus TRIGONOECIA Canu and Bassler, 1922 



TRIGONOECIA SEMOTA, new species 



Plate 1, fig. 5 



Description. — The zoarium incrusts shells; it is suborbicular, bere- 

 nicoid; the zone of growth is thin and irregular. The tubes are 

 long, cylindrical, visible, convex, arched; the peristomes are thin, 

 orbicular or elliptical, much scattered from each other. The ovicell 

 is elongated or transverse, symmetrical, convex, wrinkled transversely; 

 the oeciostomc is small, salient, orbicular, opening on the same plane 

 as the peristomes. 



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

 stome, 0.16-0.18 mm.; distance of peristomes, 0.48-0.64 mm.; sepa- 

 ration of peristomes, 0.64-0.72 mm. ; diameter of oeciostome, 0.07 mm. ; 

 diamet.H' of zoarium, 5 mm. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix, Swit- 

 zerland (common). 



Holotype.— Cat. No. 69883, U.S.N.M. 



TRIGONOECIA TUBULOSA D'Orbigny, 1853 



Plate 4, figs. 13-15 



1853. Diastopora tubulosa D'Orbigny, Pal6ontologie fran^aise, Terrain Cr6tac4 

 vol. 5, p. 827, pi. 635, figs. 1-3. 



Measurements. — Diameter of orifices, 0.09 mm.; diameter of tubes, 

 0.10 mm.; distance of peristomes, 0.90 mm.; separation of peristomes, 

 0.50 mm.; diameter of peristome, 0.12-0.14 mm. 



Structure. — The tubes become dilated in their free terminal por- 

 tion, so that the diameter of the peristome is gi-eater than that of 



