610 BULLETIN 106, UXITED 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. 



|7wz=0.06mm. 

 Measurements. Apertura i , rt - 



Ua=0.06mm. 



Affinities. This species resembles absolutely Holoporella altirostris 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) ; 3i miles north of Grovania. Georgia (rare). 



Jacksonian (Zeuglodon zone) : Shubuta, Mississippi (rare). 



Cotypes.C&t. No. 64220, U.S.N.M. 



HOLOPORELLA MICROPOKA, 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. 



rh a 0.04 mm. 

 Measurements. Apertura { , ,, 



l&z=0.06mm. 



Affinities. This species is characterized by the extreme smallness of its 

 apertura. It differs from Holoporella pisiformis in its larger zoarium, which 

 may attain 1-| cm. in diameter, in its oblique and not erect zooecia, and in its 

 still smaller apertura. 



Occurrence. Upper Jacksonian (Ocala limestone) : Below Plant System Rail- 

 road wharf, Bainbridge, Georgia (very rare) ; Old Factory, H miles above Bain 

 bridge. Georgia (common). 



Cotypes. Cat. No. 64218, U.S.N.M. 



HOLOFORELLA 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 



