AKT. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER. 49 



Genus PLATONEA Canu and Bassler, 1920. 



1920. Platonea Canu and Bassler, North American Early Tertiary Bry- 

 ozoa, Bull, 106, U. S. National Museum, p. 759. 



The type of this genus, Rcptotubigera 'philUpsae Harmer, 1915, is 

 an incrusting species with the ovicell spread out between the fascicles 

 over the entire zoarial width. The following new species are inter- 

 esting because they exhibit the same ovicell structures in the erect 

 forms of growth. Under the old classification these two species and 

 the incrusting type would be assigned to three quite different genera. 



PLATONEA SCALARIA, new species. 



Plate 11, figs. 1-5. 



Description. — The zoariiun has the Idmonea form of growth, some- 

 what enlarged at the bifurcations. The fascicles are salient, close 

 together, alternate or opposite, formed of 3 or 4 tubes. The tubes 

 are little distinct, hardly convex; the peristome is thin, orbicular 

 or rectangular. The ovicell is large, convex, wide spread between 

 the fascicles over the whole zoarial width ; the oeciostone is elliptical, 

 transverse, provided distally with a sort of raised lip, less wide than 

 a tube, hardly salient and orthogonal. 



Zooecial diameter 0.20 mm. 



Width of fascicles .25 mm. 



Distance between fascicles ,40 mm. 



Dimensions of oeciostome . 26 by 0. 14 mm. 



Zoarial width 1.20mm. 



Variations. — This species is well characterized by its fascicles regu- 

 larly arranged according to scale and quite close together, and also 

 by the form of its ovicell. We have been rather fortunate in finding 

 many ovicells and to recog-nize among them some variations. They 

 are enlarged at the bifurcations. The oeciostome is absent or 

 isolated or adjacent to a tube. In the last case the oeciostome is 

 turned toward the bottom, although the orifice placed at the base 

 of the peristomie must be in the habitual position. The form bent 

 back toward the base of the oeciostome appears therefore to be due 

 to the closeness of the distal tube. 



Occun^ence. — Sirun (Sulu Archipelago, Tawi Tawi group) ; Philip- 

 pine Islands {Albatross station D. 5151). 

 Cotypes.—CRt. No. 7375, U.S.N.M. 



PLATONEA HIRSUTA, new species. 

 Plate 11, figs. 6, 7. 



Description. — The zoarium is a short, claviform Filisparsa. The 

 tubes are little distinct, short, terminated by a very long peristomie, 



Mea,surements. — 



