138 BULLETIN 125,- UNITED STATES NATIONAL MUSEUM. 



It is therefore probable that after the passage of the eggs the polypide disappears 

 by histolysis. The zooecia with calcified orifice are not rare. Sometimes a small 

 gibbosity occurs on the frontal. 



Occurrence. — Miocene (Duplin marl) : Wilmington, 8 miles east of Snow Hill, 

 10 miles south of Greenville, and Natural Well, 2 miles southwest of Magnolia, 

 Duplin County, North Carolina (common). Miocene (Yorlvtown formation): 

 Suffolk, 3 miles southwest of Petersburg, and other localities in' Virginia (common) . 

 Miocene (Bowden marl) : Bowden, Jamaica (rare) . Pliocene (Waccamaw marl) : 

 Waccamaw River, Horry County, South Carolina (common). 



Cotypes.—C&i. Nos. 68620-68625, U.S.N.M. 



Genus CYCLICOPORA Hincks, 1884. 



(For description, see Bulletin 106, U. S. National Museum, p. 424.) 



CYCLICOPORA MULTILAMELLOSA, new species. 



Plate 46, figs. 3-6. 



Description. — The zoarium is free, irregularly orbicular, striated concentrically 



on the inferior face and formed of many superposed lamellae. The zooecia are 



heaped upon each other, little raised, nonoriented, distinct, elongated, hexagonal 



or rectangular; the frontal is little convex, tuberous, and formed of a tremocyst 



with scattered pores, resting on an olocyst. The apertura is elliptical, transverse, 



with a concave proximal border; it is placed at one of the zooecial angles. In 



the immediate vicinity of the apertura there is a small orbicular avicularium 



sometimes transformed into a long transverse avicularium. The ovicell is globular, 



salient, very large, partially embedded in the distal zooecium and always closed 



by the operculum; it is covered by the tremocyst. 



,, ^ , \ <. (/ia = 0.15mm. „ . fZ2 = 0.80mm. 



. Measurements. — Apertura , . „. Zooecia , ^ ^„ „ ^^ 



^ |to=0.20mm. ( Z2 = 0.60-0.80 mm. 



Variations. — The zooecial dimensions are quite variable; the zooecia are 

 elongated or transverse. The characteristic of tliis species is the excentric position 

 of the apertura; this and the ayicularium occupy the distal portion of the zooecium. 

 In the interior the aperture occupies its usual median position; it is therefore 

 the irregularities of calcification which causes its exterior aspect. 



Occurrence. — Pleistocene: Mount Hope, Panama Canal Zone (rare). 



Cotyfes.— Cat. No. 68626, U.S.N.M. 



CYCUCOPORA? MANSFIELDI. new species. 



Plate 19, fig. 11. 



Description. — The zoarium incrusts Cellepore bryozoa. The zooecia are 

 distinct, separated by a furrow of little depth, elongated, elliptical; the frontal is 

 little convex and covered with large, widely spaced tremopores. The apertura 

 is suborbicular, the proximal border being simply concave; neither cardelles nor 

 peristome are present. 



Aa = 0.12mm. „ . [Z2 = 0.35mm. 



.¥easuremen<s.— Apertura I „' ;; " Zooecia 



[La =0.12 mm. 



Iz =0.25-0.30 mm. 



