NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
163 
oral avicularia. The ovicell is endozooecial, enormous, borne by a considerably 
enlarged zooecium; its frontal is garnished with radiating and granulated costules. 
= 0.14 mm. 
= 0.12 mm. 
Measurements. —Young zooecia: Aperturaj^ 
Zooecia 
( 1,2 = 0.60 mm. 
[Iz =0.28-0.30 mm. 
Old zooecia: Apertura 
ha = 0.24 mm. 
la =0.16 mm. 
Zooecia 
[7,2 = 0.70 mm. 
\lz =0.24-0.30 mm. 
Affinities. —The genus Metrarabdotos contains more species in America than in 
Europe. The present species differs from Metrarabdotos moniliferum Milne-Edwards, 
A. Hippopodina 
D. Metrarabdotos E AVatersipora 
F. Hippaliosina G.Tremogasterina 
Fig. 29.—Genera of the Hippopodinidae Levinsen, 1909. 
A. Hippopodina Levinson, 1909; H. feegeensis Busk, 1884, X 35. B. Cheilopora Levinsen, 1909; 
C. sincera Smitt, 1867, X 20, C. Cheiloporina , new genus; C. haddoni Harmer, 1902, X 44. D. Met¬ 
rarabdotos Canu, 1914; M. moniliferum Milne-Edwards, X 25. E. Watersipora Neviani, 1895; W. cucul- 
lata Busk, 1853, X 35. F. Hippaliosina Canu; H. rostrigera Smitt, 1872, X 20, G. Tremogasterina 
Canu 1911; T. horrida, new species, X 20. 
1836, common in the French Miocene, in its granulated costules on the ovicell, in 
the absence of a pseudolyrule at the peristomice, and in the absence of oral avic¬ 
ularia. It differs from Metrarabdotos grandis of the Vicksburgian, which also forms 
large fronds, in its greater zooecial width and in much less deep intercostular spaces 
