132 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Upper Jacksonian (Ocala limestone) : 3i miles north of Grovania, Georgia 

 (very rare) ; Alachua, Florida (very rare) : 9 miles north of Ocala. Florida (very 

 rare) . 



Habitat. Mediterranean : off France and Italy. Atlantic : the Madeira Islands 

 and Tristan da Cunha. China Sea. at Tizard. Pacific: Japan (var. japonica Ort- 

 mann, 1890). 



PIesiotypes.C*t. Nos. 63894, 63895, U.S.N.M. 



GRAMMELLA TRANSVERSA Canu and Bassler, 1917. 

 Plate 25, figs. 7, S. 



1917. Grammclla transversa CANU and BASSI.EK, Synopsis of American Early Tertiary 

 Cheilostonie Bryozoa, Bulletin 96, United States National Museum, p. 20,'pl. 2, 0g. 6. 



Description. The zoarium incrusts bryozoa. The zooecia are but little elon- 

 gated, broad, distinct; the mural rim is thin, sharp edged, regular. The opesium 

 is of the same form as the zooecium. The ovicell is salient, globular, smooth, 

 and carinated. The avicularium is interzooecial small, elliptical, and the pivot is 

 never median; its longitudinal axis is transverse with respect to the zooecial axis. 



Measurements. Opesia 



0=0.45 mm. . |Zs=0.55-0.60 mm. 



/ooecia 



^0=0.35-0.40 mm. Uz=0.4G-0.50 nun. 



Affinities. The avicularium is generally elliptical, but it is sometimes tri- 

 angular (fig. 8). The mural rim exhibits a rare and interesting peculiarity. It is 

 not provided with a side which merges into the zooecium so that the opesium is 

 bounded by the termen itself of the mural rim. 



The present form differs from other described species of GrammeUa in its small 

 avicularia transversally oriented. 



Occurrence. Middle Jacksonian: Wilmington. North Carolina (rare) ; Eutaw 

 Springs, South Carolina (very rare). 



Cotypes.Cat. No. 62579, U.S.N.M. 



GRAMMELLA PUS1LLA, new species. 



Plate 25, figs. 9-13. 



Description. The zoarium incrusts other bryozoa and calcareous algae. The 

 zooecia are small, elongated, distinct, oval, or elliptical, with or without a very small 

 gymnocyst; the mural rim is quite prominent, thin at the top, enlarged at the base, 

 finely granulated. The opesium is elliptical. The ovicell is globular, granulose, 

 deeply excavated, ornamented, with a callosity, and distinct from the mural rim. 

 The aucestrula is small and its mural rim very thin. The avicularium is inter- 

 zooecial, somewhat larger than an opesium; its pivot is placed a little below the 

 transverse axis of the opesial ellipse. 



[A0=0.26 mm. 



Measurements. Opesia , 1" Zooecia 



170=0.18 mm. 



Zs=0.40 mm. 

 fe=0.22-0.26 mm. 



