610 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
rated from a convex poster by two small cardelles. On the frontal is an oval 
avicularium with pivot and pointed beak and placed obliquely with respect to the 
apertura. The ovicell is hyperstomial, salient, globular, smooth. The deep zooecia 
have an analogous apertura and an oral pedunculate avicularium quite salient, 
just to the level of the superficial zooecia. The incomplete zooecia are abundant; 
they are formed either by simple cavities or by zooecia deprived of frontal. 
lr , . \ka=0.0Q mm. 
Measurements .- — Apertura ■ , 
lZa=0.06mm. 
Affinities. — This species resembles absolutely Holoporella aUirostris in all its 
general characters. It differs from it only in its smaller micrometric dimensions, 
the smaller oral avicularium, and the absence of the two spines of the peristome. 
It appears like a minor variety. The true difference is in the appearance of the 
zoarium which particularly affects the convexity of shells. 
Occurrence.- — Middle Jacksonian: Baldock, Barnwell County, South Caro- 
lina (very common) ; one-half mile southeast of Georgia Kaolin Co. mine, Twiggs 
County, Georgia (rare) ; 34 miles north of Grovania, Georgia (rare). 
Jacksonian (Zeuglodon zone) : Shubuta, Mississippi (rare). 
Cotypes. — Cat. No. 64220, U.S.N.M. 
HOLOPORELLA MICROPORA, new species. 
Plate 76, figs. 7-10. 
Description. — The zoarium is free, massive, and globular. The superficial 
zooecia are small, little erect, simple, oblique; the frontal is smooth and convex; 
it is terminated by an aviculiferous salient beak. The apertura is quite small 
and semilunar; two small cardelles separate the concave poster from a larger 
anter. The deep zooecia have their umbo completely developed. The interzooecial 
avicularia are rather large, elliptical, rare. 
, r . |7ta=0.04mm. 
M easurements. — Apertura , r ,„ 
1 [te=0.06 mm. 
Affinities. — This species is characterized by the extreme smallness of its 
apertura. It differs from Holoporella pisiformis in its larger zoarium, which 
may attain 14 cm. in diameter, in its oblique and not erect zooecia, and in its 
still smaller apertura. 
0 ccurrence.- — Upper Jacksonian (Ocala limestone) : Below Plant System Bail- 
road wharf, Bainbridge, Georgia (very rare) ; Old Factory, 14 miles above Bain 
bridge, Georgia (common). 
Cotypes. — Cat. No. 64218, U.S.N.M. 
HOLOPORELLA SEPOSITA, new species. 
Plate 102, figs. 7-9. 
Description. — The zoarium is free, massive, globular, and of the size of a 
pea or fastened on the bryozoa in small, very convex masses. The superficial 
