NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



407 



avicularia are triangular, thin, transverse, rarely disposed symmetrically. Four 

 spines. Back of the apertura there is a distal armature bearing laterally two large 

 condyles; these condyles limit the orifice of the compensatrix. 



Genotype. Romancheina martiali Jullien, 1888. 



Range. Jacksonian-Recent. 



ROMANCHEINA HEXAGONA, new species. 



Plate 53, fig. 26. 



Description. The zoarium incrusts free bryozoa. The zooecia are large, some- 

 what elongated, hexagonal, enlarged in the median part; the frontal is convex and 

 formed of a tremocyst with numerous small pores in quincunx. The apertura is 

 semilunar somewhat elongated, removed from the distal border of the zooecium; 



C '35 



A 20 



FIG. 120. Genus Romancheina Jullien, 1888. 



A. Romancheina martiali Jullieu, 1888. Zooecia, X 20. (After Jullien, 1888.) 

 B-D. Rwnanclielna, prestans, var. Waters, 1889 (not Hincks). B. Zooecia with cleft 

 mucro, X 25. 0. Operculum X 85. D. Avicularian mandible, X So. (After Waters, 1889.) 



the peristome is little salient, very thick, ornamented with 4 distal, hollow spines 

 with a proximal mucro little salient. The ovicell is large, little convex, of the 

 same nature as the frontal; it is hyperstomial, deeply imbedded in the distal 

 zooecium and it opens into the peristomie. The two symmetrical avicularia are thin 

 very long, disposed transversally, and with very pointed beak. 



(7,3=0.60-0.80 mm. . ffo=0.10mm 



1^=0.60-0.70 mm. a |Aa=0.12m m . 



Measurements. Zooecia 



Affinities. This species differs from Romancheina parvipunctata in its non- 

 terminal and nonoblique apertura, the distal part of the peristome being on the same 

 level as the proximal portion, in its less salient mucro and in its greater zooecial 

 width. 



