NORTH AMKKH AN KA1ILY TERTIARY BRYOZOA. 



421 



Genus HOUZEAUINA Pergens, 1889. 



1SS9. Jlaiizi'iiitina PERGENS, Sur fossilen Br.vozoenfauna von \Yola Lnzanska, Bulletin 

 Societe Beige cle Geologie. vol. 3, p. GS. 



The ovicell is hyperstomial and imbedded in the distill zooecia; it is closed 

 by the operculum. The frontal i> an olocyst perforated laterally by some areolae. 

 The avicularium is derived from a lateral areola, but it develops at the middle 

 of the frontal. 



1). Anarthropora E. Aimulosia F. Cyclocolposa G. Cyc 



FIG. 124. Miscellaneous .iieneru of the Escharellidae. 



A. Houzcinihin cnUoxn, new ^iiecies, Y. 20. Middle .Tacksoiiian of Georgia. 



B. C'lirlii-iiiiiii-u cot inn, now srn'i-ics, Y. -t\. Yifksburgian of Alabama. 



C. Kymella polaris Waters, 1904. X 16. Recent. 



] >. Aiinrthroi>oi-/i nmicoxii, new species, K uu. Midwayan of Georgia. 



E. Aimulosia australis Jullien. 1SSS. X 25. Recent. 



F. Cyclocolposti pcrforata. new spiM-ies. X 20. Pliocene of South Carolina. 

 <;. ('/"''"/" >'i< 'II" I'libi'ii, new specie's. I'd. Miocene of North Carolina. 



Genotype. llouscaitlint (Kxi-lmni) jnu'<ill<l<t Reuss, 1869. 



Range. Jacksonian-Priabonian. 



This <renus is very remarkalile and we have no recent equivalent. ~\\"e think 

 that the operculum closes at the same time the ovicell and the /ooecia : the height 

 of the real aperture is, in effect, somewhat larger than that of the external aper- 

 ture. This common operculum is of different form from the operculum of the 

 nonovicelled zooecia. 



The mode of formation and the origin of the median avicularium is as remark- 

 able as unexpected. It was in -tudying the interior of the zooecia that we made this 



