94 



PROCEEDINGS OP THE NATIONAL MUSEUM 



VOL. 72 



1923. Schizopodrella floridana Canu and Basslek, North American Later 

 Tertiary and Quaternary Bryozoa. Bull. 125, U. S. National Muse- 

 um, p. 106, pi. 16, figs. 11-15. 



, , , f/ia = 0.17-0.20 mm. 

 Measurements . — Apertures 



[la-- 



\Lz- 



= 0.15 mm. 

 0.85-90 mm. 



Zooeciai , . . . 



us = variable. 



Structure. — In 1923 we figured a group of marginal zooecia oriented 

 and deprived of the large frontal avicularium. The other zooecia are 

 arranged in every way ; they bear an enormous, very salient avicu- 

 larium which has furnished us the mandible. This lack of orientation 

 explains the irregularities of our section of 1923; it approaches, how- 

 ever, that Waters figured, 1918, for ScMzoporella viridis and in which 

 the arrangement indicated the independence of the superposed lamel- 

 lae in the multilamellar colonies. 



Fig. 15.— Genus Schizopodrella Canu and Basslek, 1917. A-C. Schizopodrella pungens, new- 

 species. A, B. Two opercula, X 85. C. Mandible, X 85. D, E. Schizopodrella floridana 

 OsBURN, 1914. D. Operculum. E. Mandible of a large avicularium. F, O. Schizopodrella 

 falcifera, new species. F. Operculum. Q. Mandible of large interzooecial avicularium 



The operculum is light colored. It has no peculiarities of form . 

 On the interior the tremopores are not visible at an enlargement of 

 X20, but they are apparent by transparency; there are no condyles 

 for the articulation of the operculum. 



Biology. — The colonies form voluminous masses attaining the size 

 of the fist, according to the number of superposed lamellae. The 

 latter curve around and surround a small stony fragment; sometimes 

 the substratum is an algal frond and it is necessary that the colony 

 be very light in spite of its large volume. "The color ranges from 

 pure white to dark purplish and red " (Osburn) . The frontal ectocyst 

 is alone colored; the interior of the zooecia as well as all the calca- 

 reous skeleton is not colored. 



Only the young marginal zooecia have the aspect shown in Osburn's 

 figure. The other cells are unoriented, the oral avicularium is lack- 



