104 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



STVLOPOMA MINUTA, new species. 



Plate 3, fig. 8. 



Description. — The zoarium incrusts shells. The zooecia are distinct, separated 

 by deep furrows, elongated, small; the frontal is convex and provided with small 

 tremopores. The apertura is small, transverse, semielliptical with a narrow rec- 

 tangular rimule on the proximal, rectilinear border; the peristome is thin, sharp, 

 salient. The ovicell is very large, globular, provided with protuberances and en- 

 tirely covers the apertura. In the vicinity of the apertura there is a small triangular 

 avicularium with pivot, the beak of which is turned obliquely toward the top. 



{ha = 0.05 mm. „ . f is =0.40-0.45 mm. 



Measurements. — Apertura \ j „ „„ Zooecmm ] ■, r, c^r r, on ^ 



^ [ la =0.07 mm. I tz = 0.25-0.30 mm. 



This is the smallest known species of the genus Stylopoina. 



Occurrence. — Miocene (Bowden marl) : Bowden, Jamaica (rare). 



Holotype.— Cat. 68556, U.S.N.M. • 



Genus SCHIZOPODRELLA Canu and Bassler, 1917. 



(For description, see Bulletin lOG, U. S. National Museum, p. 338.) 



SCHIZOPODRELLA ACULEATA, new species. 



Plate 31, figs. 13, 14. 



Description. — The zoarium is massive, very large and formed of many super- 

 posed lamellae. The zooecia are little distinct, elongated, separated by an irreg- 

 ular furrow, elliptical or rectangular; the frontal is a tremocyst with large, widened 

 pores. The apertura is suborbicular and bears a wide, rounded rimule of little 

 depth; the peristome is thin, complete and salient on the zooecia of the internal 

 lamellae. The ovicell is globular, salient, covered with tremopores. The avic- 

 ularium with pivot is placed in the vicinity of the apertura; it is very long and 

 terminates in a point. 



Measurements. — Apertura | , r.\r, r^ -.r Zooecia 1 , ~ Ar 



uo =0.12-0.15 mm. U2 = 0.25 mm. 



Affinities. — This species differs from ScMzoporella cumulata Ulrich and Bassler, 

 1904, in the length of its avicularium (Z=0.40 mm.). It differs from Sc/ii- 

 zopodrella longirostris Hincks, 1886, wliich also bears a large avicularium, in the 

 much greater width of its rimule. When the large avicularium is not much de- 

 veloped S. aculeaia much resembles Stylopoma spongites Pallas, 1766; it differs from 

 it in its rimule which is wide and concave and not small and rectangular and also in 

 the different form of the ovicell. It differs from ScMzopodrella unicornis Johnston, 

 1847, in which the apertura is identical, in the presence of a single very large 

 avicularium. 



Occurrence. — Pliocene (Waccamaw marl) : Waccamaw River, Horry County, 

 South Carolina (very rare). 



Cotypes.—C&t. No. 68557, U.S.N.M. 



