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BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
pores and is sometimes covered with punctations of pleurocystal origin. The 
aperture is oval, elongate, formed of a large semilunar anter and of a wide proximal 
sinus. The ovicell is deeply embedded in the distal zooecium, little salient, closed 
by the operculum, ornamented by an orbicular and very fragile frontal area. 
Measurements. —Aperturaj 
ha =0.15 mm. 
la =0.12 mm. 
Zooecia* 
Lz =0.60 mm. 
. lz =0.40 mm. 
Affinities. —The punctations of the frontal are quite variable; there is not a 
single zooecium similar to another. In a better preserved state we think that each 
zooecium is surrounded with areolar pores irregular in size and spacing. The frontal 
is a thick and compact olocyst, covered by a pleurocyst which is granular or 
punctured with large pores which do not perforate the zooecial walls. Unfortu¬ 
nately we have not been able to confirm this exterior aspect by sections. 
The possible relationship of this species to Schizopodrella mutabilis Canu and 
Bassler, 1919, has been mentioned under the discussion of that species. 
Occurrence. —Lower Miocene (Bowden formation): Bowden, Jamaica (rare). 
Cotypes. —Cat. No. 68581, U.S.N.M. 
Fig. 17. —Genera of the Microporellae. 
A. Microporella Hincks, 1887; M. ciliata Pallas, 1766, X 43. B. Subgenus Diporula Hincks, 1880; 
D. verrucosa Peach, 1868, X 25. C. Subgenus Ellipsopora, new; E. flabellaris Busk, 1852, X 40. D. 
Subgenus Flustramorpha Gray, 1848; F. marginata Krause, X 40. E. Fenestrulina Jullien, 1888; F. 
malusi Savigny-Audouin, 1826, X 20. F. Calloporina Neviani, 1895; C. decorata Reuss. 1847, X 40. G. 
Inversiulu Jullien, 1888; I. inversa Waters, 1889, X 50. 
