ART. 23 CYCIjOSTOMATOUS BRYOZOA CANU AND BASSLEB 36 



SPINOPORA NEOCOMIENSIS, new species 



Plate 26, figs. 6, 7 



Description. — The zoarium is free, siibcylindrical, hollow, branched. 

 The orifices are polygonal, small, arranged in quincunx, separated by 

 very salient tuberosities. The zoarial tubercles are very salient, 

 smooth, much scattered, arranged in quincunx. 



Measurements. — Diameter of orifices, 0.16 mm.; diameter of zoa- 

 rium, 4 mm. 



Affinities. — The zoarial form in this species is very different from 

 that of the genotype, but the external characters are absolutely iden- 

 tical. We have not been able to make sections. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix (Vaud)^ 

 Switzerland. 



Cotype.—C&t. No. 69SS0, U.S.N.M. 



Division OVICELLATA 



Subdivision Parallelata Waters, 1887 

 Family MECYNOECIIDAE Canu, 1918 



Genus MECYNOECIA Canu, 1918 



MECYNOECIA ICAUNENSIS D'Orbigny, 1850 



Plate 1, figs. 1-4 



1850. Entalophora icaunensis D'Orbigny, Prodrome de Pal^ontologie, vol. 2, 



p. 87. 

 1853. Entalophora icaunensis D'Orbigny, Pal6ontologie francaise, Terrain 



Cr6tac6, vol. 5, p. 781, pi. G16, figs. 12-14. 



Measurements. — 



Small Large M.probos- 



brancbes branches cidea 



I Mm. Mm. Mm. 



Diameter of aperture | 0.16 0.12 0.16 



Diameter of peristome.. .24 .24-.30 . 16-.20 



Distance of peristomes 1.20(1.76) 1.20 1.20-1.40 



Separation of peristomes 1 .80 .80 .30-.40 



Affinities. — This species was identified by Pergens, in 1889 with 

 Entalophora prohoscidea Milne-Edwards, 1838, and by Gregory, 1899, 

 with Entalophora virgula Hagenow, 1840. According to these authors, 

 it begins in the Neocomian and still exists in the recent seas. The 

 Neocomian species appears to us distinct and to differ from the recent 

 species in its more crowded and smoother tubes. We figure a few 

 variations. The structure is identical with that of the recent species 

 and of some Tertiary specimens of which we have published sections 



