EARLY TERTIARY CHEILOSTOME BRYOZOA. 61 



continued into an expansion which forms a partial partition be- 

 tween the ovicell and the zooecium; uniporous septulae; no peris- 

 tome." (Levinsen, 1909.) 



Genotype, — IlippoiJodina {Lepralia) feegensis Busk, 1884. 



Range. — Jacksonian-Recent. 



HIPPOPODINA VIBRACULIFERA, new Bpecies. 



Plate 5, fig. 8. 



Description. — The zoarium is free, biLamellar; the two lamellae 

 back to back are easily separated. The zocecia are elongated, large, 

 hexagonal; the frontal is convex and formed of a tremocyst with 

 very numerous pores placed on a very finely perforated olocyst from 

 which it is separable. The apertura is formed of a very large orbic- 

 ular anter and of a narrower poster with proximal lip straight and 

 denticulated; the vestibular arch is clearly visible. The endozooecial 

 ovicell is immense and takes the place of a zooecium; it is convex 

 and perforated with tremopores; the apertura of the ovarian zocecia 

 is much larger. Two auriculate vibracula are placed symmetrically 

 on the distal part of the zocecia. 



1^/7=0.25 mm. 

 MeasuveTnents. — Apertura of ordinary zooecia j ^__q 28 jj^ni. 



|7m=:0.25mm. 

 Apertura of ovarian zocecia [ ^^—-q 35 mm 



IZs=0.90-1.10mm. 

 Zocecia I ?2=0.80-1.00mm. 

 Occurrence. — Middle Jacksonian: Wilmington, North Carolina 

 (common). 



Upper Jacksonian (Ocala limestone) : Old factory, 1^ miles above 

 Bainbridge, Georgia (rare). 

 Type.—C^t No. 6260-1, U.S.N.M. 



Genus METRARABDOTOS Canii, 1914. 



1914. Mctrarahdotos Canu, Les Bryozoires fossiles Sud-Ouest France. Bul- 

 letin Societe Geologique France, ser. 3, vol. 14. p. 472. 



The ovicell is endozooecial. The apertura is semilunar, with a 

 rimule and lyrule. The frontal is surrounded with lateral areolae 

 and formed of an olocyst surmounted by a pleurocyst. 



Genotype. — Metrarabdotos {Eschara) moniliferum Milne-Ed- 

 wards, 1838. 



Range. — Priabonian-Astian, 



The genotype is a common and characteristic Yicksburgian fossil 

 of the Southern States. 



