NORTH AMERICAN EARLY- TERTIARY BRYOZOA. 
3«3 
HIPPOMENELLA ANGUSTAEDES, new species. 
Plate 49, figs. 18, 19. 
Description. — The zoarium is free and formed of two lamellae, back to back, 
and inseparable ; the fronds are of little width , fiabellate, and do not contain more 
than six longitudinal rows of zooecia. The zooecia are elongated, distinct, oval; 
the frontal is convex, smooth, and garnished with a double lateral row of areolae, 
numerous and small. The aperture is elliptical, elongated, divided into equal parts, 
by two cardelles; the peristome very little salient, bears 4 to 6 large distal spines. 
The avicularia are placed laterally in the vicinity of and below the aperture ; they 
have a pivot and their triangular beak is directed downward ; they are never equal 
in size. 
Zooecia 
Zs=0.70-0.S0 mm. 
73=0.46 mm. 
Affinities. — This species differs from Hippomenella transversata in its smaller 
micrometric measurements (Zs< 0.80 mm.) and in its lower placed avicularia, 
which are larger and more oblique. 
It differs from Hippomenella incondita in its much smaller avicularia and 
its orifice exteriorly elliptical and not semilunar. 
It differs from Tlippom enella capitimortis in the size of its avicularia and in 
its aperture exteriorly elliptical (and not semilunar). 
It differs from Hippomenella costulata in its avicularia placed lower and 
with a beak turned downward (and not laterally) and in the presence of oral spines. 
It differs from Hippomenella rotula in its narrow fronds and its elliptical 
aperture garnished with spines. 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (rare). 
Holotype. — Cat. No. 64079, U.S.N.M. 
HIPPOMENELLA INCONDITA, new species. 
Plate 50, figs 1-8. 
Description. — The zoarium is free, formed of two lamellae, back to back, and 
inseparable; the fronds are wide, irregular, and undulated. The zooecia are dis- 
tinct, somewhat elongated, elliptical, swollen; the frontal is convex and garnished 
laterally with a double row of large areolae. The aperture is exteriorly semi- 
lunar; the proximal border has a very convex mucronoicl protuberance. The ovicell 
is hyperstomial, salient, globular, much imbedded in the distal zooecia, never closed 
by the operculum, very irregularly punctate. The avicularia are placed laterally 
on the line of the areolae, close to and somewhat beloiv the aperture; they are 
small, little prominent, and their beak is directed downward. No spines. 
Measurements. — Aperture I 7:a=0.13 mm. „ . I Zs= 0.75-0. 90 mm. 
(exterior) [7a=0.15 mm. ' J °° e ia 1 ?s=0.24-0.25 mm. 
Variations. — The zooecia are long (fig. 2) or short (fig. 3). The punetations 
of the ovicell are very irregular (figs. 5-7) and rarely (fig. 6) it is possible to 
