GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 121 



Family CONESCHARELLINIDAE Levinsen. 

 Genus STICHOPORINA Stoliczka. 



STICHOPORINA TUBEROSA, new species. 



Plate 53, figs. 9-12. 



The zoarium is free, conical, hollow with very thick walls. The 



peristome is salient, ornamented with small tuberosities ; it bears one 



or two small elliptical avicularia with bar or denticles. The ovicell 



is large, somewhat salient, convex; it is hyperstomial and always 



closed by the operculum. On the lower face, there are large pores 



surrounded by very small ones. 



„ ' A f ha=0.15 mm. 



Measurements. — Apertura 1 7 „ __ 



^ [7a=0.09 mm. 



This is a very elegant species characterized by its peristomial tuber- 

 osities. The ancestrula is visible only in the interior of the zoarium ; 

 it is covered exteriorly b}^ the first zocecia. All the zooecia are sepa- 

 rated from each other by small canals which appear to end in the 

 large, inferior pores. 



This species must not be confounded with Marrvillopora cupula 

 Smitt, 1872. It differs from it in its ovicell which is not bilobate 

 and in its ovarian zooecia which are not larger than the others. 



Occurrence. — Miocene, Banana River, Costa Rica, D. F. McDonald, 

 collector, 1911. 



Gotypes.— Cat. No. 65040, U.S.N.M. 



EXPLANATION OF PLATE 53. 



Ogivalina mutaMHs, new species. 



Fig. 1. The type-specimen, X 20, with large irregular opesia, small ovicell, small 

 gymnocyst and one zoecium with a fusiform avicularium. 

 Emperador limestone, Crocus Bay Hill, Anguilla. 



Cupularia umbellata Defrance. 



Fig. 2. Two zoaria, natural size. 



3. Celluliferous convex surface, X 20. 



4. Concave surface, X 20. 

 Miocene, Banana River, Costa Rica. 



Cupularia canariensis B\;sk. 



Fig. 5. Two zoaria, natural size. 



6. Celluliferous convex surface, X 20. 



7. Concave surface, X 20. 

 Miocene, Banana River, Costa Rica. 



