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-Becent. 
ROMANCHEINA HEXAGONA, new species. 
Plate 53, fig. 26. 
D eseription . — 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 zooeci-um; 
Fig. 120. — Genus Romancheina Jullien, 1888. 
A. Romancheina martiali Jullien, 188S. Zooecia, X 20. (After Jullien, 18S8.) 
B-D. Romancheina prestans, var. Waters, 1889 (not Hindis). B. Zooecia with cleft 
mucro, X 25. C. Operculum X 85. D. Avicularian mandible, X 85. (After Waters, 1889.) 
the peristome is little salient, very thick, ornamented with 4 distal, hollow spines 
with a proximal mucro little salient. The oviccll 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. 
r _. . rZs=0.60-0.80 mm. 
M easurements. Zooecia { Zb=0 . 60 _ 0 . 70 mm . 
f7«=0.10znm 
Apertura { Aa= oi 2mm . 
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. 
