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. 



. , ^ \ha = 0.14 mm. 

 Measurements. — Young zooecia: Aperturaj^^ =o 12 mm. 



(is = 0.60 mm. 

 Zooecia 1^^ = 0.28-0.30 mm. 



. , , fAa = 0.24mm. 

 Old zooecia: Aperturaj^ ^^^^ ^^ 



(1,2 = 0.70 mm. 

 Zooecia |^^ =0.24-0.30 mm. 



Affinities. — The genus Metrarahdotos contams more species in America than in 

 Europe. The present species differs from Metrarahdotos moniliferum Milne-Edwards, 



Hippaliosina G.Tremogasterina 



^ Fig. 29. — Genera of the Hippopodinidae Levinseii, 1909. 



A. Hippopodina Le\inson, 1909; n. fcegeensis Busk, 1884, X 35. B. Cheilopora Levinsen, 1909; 

 C. sintera Smitt, 1867, X 20, G. Chciloporina. new genus; C. haddoni Hanner, 1902, X 44. D. Met- 

 rarahdotos Ganu, 1914; M. moniliferum Milne-Edwards, X 25. E. Watersipora Neviani, 1895; IK cucul- 

 lata Busk, 1853, X 35. F. Hippaliosina Ganu; H. rostrigera Smitt, 1872, X 20. G. lycnwgastmna 

 Canu 1911; T. horrida, new species, X 20. 



1836, common in the French Miocene, in its granukted costules on the ovicell, in 

 the absence of a pseudol.yrulc at the peristomice, and in the absence of oral avic- 

 ularia. It differs from Metrarahdotos grandis of the Vicksburgian, which also forms 

 large fronds, in its greater zooecial width and in much less deep intercostular spaces 



