478 SYSTEMATIC PALEONTOLOGY 



Occurrence. — Choptank Fokmatio.v. Jones Wharf. Calvert For- 

 mation. Plum Point. 



Collection. — Maryland Geological Survey. 



Polymorphina regina Brady, Parker and Jones. 

 Plate CXXXIIT, Fig. 7. 



rohjiiiorpMna regina Brady, Parker and Jones, 1870, Trans. Linn. Soc. London, 

 vol. xxvii, p. 341, pi. xli, tig. 32, a, b. 



Description. — The external ornament of closely set, regular longi- 

 tudinal costse serve to separate this species from its congenitors, P. pro- 

 hlema and P. ohlonga. There are six or seven chambers clustered about 

 a central axis and with deeply depressed septal lines. Species of striate 

 Polymorphina are comparatively rare and but few occur. In present 

 oceans this species is confined to shallow waters near islands in the Pacific. 



Occurrence. — Calvert roR:MATiON. Chesapeake Beach. 



Collection. — Maryland Geological Survey. 



Genus UVIGERINA d'Orbigny. 



The essential features of the genus Uvigerina consist of an elongated 

 spire of irregular shaped chambers arranged in three series and termin- 

 ating in an elongated tubular neck upon which is situated the everted 

 lij) around the aperture. The normal triserial arrangement is not 

 always adhered to and biserial forms occur as well as those with more 

 than three chambers in one series. The surface of the shell is also 

 variously ornamented and in other cases the chambers are smooth. 



Morphologically it is related to the Pohjmorphince but the aperture 

 alone is sutficient to distinguish the two. It dates from the Eocene 

 period and exists in present oceans at all depths and over all seas. 



Uvigerina canariensis d'Orbigny. 

 Plate CXXXIII, Fig. 8. 



Uvigerina vanariensis d'Orbigny, 1839, Foram. Canaries, p. 138, pi. i, figs. 25-27. 

 Uvigerina canariensis Bagg, 1898, Bull. Amer. Pal., No. 10, p. 31. 



Description. — The test of Uvigerina canariensis is recognized by its 

 smooth surface although faint indications of strige are sometimes seen here 

 and in the form described by d'Orbigny under the name of U. urnula 



