NOKTH AMERICAN LATEK TERTIARY AND QUATERNARY BRYOZOA. 195 



Family MECYNOECIIDAE Canu, 1918. 



Forma ENTALOPHORA Lamouroux, 1821. 



(For remarks see Bulletin 106, U. S. National Museum, p. 734.) 



ENTALOPHORA FASCICULIFERA, new species. 



Plate 41, figs. 1-.5. 



Description.— The zoarium is free, cylindrical, mth the Entalophora form of . 

 growth. The tubes are long, distinct, separated by a furrow, convex, and slightly 

 striated transversely: at their extremity they are bent almost perpendicularly 

 to the zoarium and are prolonged in a long, free peristomie; they are sometimes 

 bigeminate. The peristomes are thin and widened. 

 Measurements: 



Diameter of the little salient peristomes 0.14 mm. 



Length of the peristomie 0-50 mm. 



Diameter of the peristome at the extremity of the long 



peristomies - --- 0-20 mm. 



Diameter of the tubes on the zoarium 0.30 mm. 



Distance between the peristomes. - 1-00 mm. 



Diameter of the branches 0.80 mm. 



Affinities.— The characteristic of this species is furnished by the presence of 

 small bundles formed of two tubes partially joined by their peristomie. The 

 species differs from Mecynoecia prohoscidea Milne-Edwards, 1838, in its smaller 

 micrometric dimensions and in the frequent presence of bigeminate zooecia. 



Occwrrence.— Pleistocene: Santa Monica (Tremochal Canyon) (rare), and 

 Dead Mans Island, off San Pedro, California (very rare). 

 Cotypes.—C&t. No. 68732, U.S.N.M. 



Family ONCOUSOECIIDAE Canu, 1918. 



Forma FILISPARSA D'Orbigny, 1853. 



FILISPARSA CLARKI, new species. 



Plate 41, figs. 11-19. 



Description.— The zoarium is free, compressed, bifurcated: the zooecia are 

 placed on the anterior face; the dorsal is convex, striated longitudinally and trans- 

 versally. The tubes are visible, convex, curved outward at their extremity and 

 terminated by a rather long peristomie; the peristomes are thin, orbicular, arranged 

 in quincunx or in oblique rows. 

 Measurements: 



Diameter of tlie orifice 0.14 mm. 



Diameter of the peristome 0.18-0.20 mm. 



Zooecial diameter (on the zoarium) 0.24 mm. 



Distance between the peristomes ...--. 1 .00 mm. 



Separation of the peristomes 0.76-0.80 mm. 



