112 



BULX.ETIN 125, UKITED 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 oviccU is deeply embedded in the distal zooecium, little salient, closed 



by the operculum, ornamented by an orbicular and very fragile frontal area. 



,, . A ^ f^a.=0.15mm. r, ■ fis =0.60 mm. 



Measurements. — Apertura , . , „ Zooecia , _ . _ 



^ 1 Za =0.12 mm. I Iz =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. 



A.Microporella 



B. Diporula 



*) 



D.Flustramorpha E. FenestruVna F.Calloporina G . Inversiula 



Fig. 17. — Genera of the Microporellae. 



A. MicToporclla Hincks, 1887; Jlf. dliata Pallas, 1766, X 43. B. Subgenus Dipomia Hincks, 1880; 

 D. verrucosa Peach, 1868, X 25. C. Subgenus KZipsoporo, new; E. fiahellans Busk, 1852, X 40. D. 

 Subgenus Flustravwrpha Gray, 1848; F. marghmta Krause, X 40. E. Fencstrulina Jullien, 1888; J^. 

 maltm Savigny-Audouin, 1826, X 20. F. Calloponna Neviani, 1895; C. decorata Reues. 1847, X 40. G. 

 Inversiulu Jullien, 1888; /. inversa Waters, 1889, X 50. 



