-1:96 SYSTEMATIC PALEONTOLOGY 



mm. Small puncta occasionally occur scattered among the larger. L. of 

 s. .049 mm. to .099 mm. Variable. 



Occurrence. — Calvert Formation. Flag Pond, f mile south of 

 Parker Creek, 3 miles north of Parker Creek, Plum Point, ^ mile north 

 of Forest Wharf, Nomini Bay, Chesapeake Beach, God's Grace Point, 

 Fairhaven, 1 mile west of Tracy Landing, 1^ miles southeast of Marriott 

 Hill, 1 mile north of Jewell, 1 mile north of Jones Point, 1 mile south 

 of Chesapeake E. E. Bridge. 1 mile northwest of West Elver, 1 mile 

 east of Marriott Hill. 



Collection. — Maryland Geological Survey. 



BiDDULPHiA TRIDENS Ehreuberg. 



Genus TERPSINOE Ehrenberg. 

 Terpsinoe AMERICANA (Bailey). 



Genus ANAULUS Ehrenberg. 

 Anaulus birostratus (Grunow). 



Genus HEMIAULUS Ehrenberg. 



Hemiaulus bifrons Ehrenberg. 



Hemiaulus polycistuiorum Ehrenberg. 



Hemiaulus solenogeros (Ehrenberg). 



Genus PLOIARIA Pautocsek. 



Ploiaria petasiformis Pautocsek. 



Genus GRAYA Grove and Brun 



Graya argonauta Grove and Brun. 

 Plate CXXXV, Fig. 8. 



Graya argonauta Grove and Bruu, 1S96, Van Heurck, in Treatise on the Diato- 



maceae, (Baxter's translation), p. 458, tig. 187. 

 Oraya argonauta Boyer, 1901, Proc. Acad. Nat. Sci. Pbila., vol. lii, p. 743. 



Description. — Valve elliptical. Surface elevated at the center and 

 ends, subtly punctate near the margin, the puncta becoming more promi- 

 nent along the longitudinal axis, where they are about 7 in .01 mm., 

 radiating from a nodular center. Zonal view quadrangular. L. of s. 

 .099 mm. to .181 mm. 



Occurrence. — Calvert Formation. 1 mile east of Marriott Hill, 

 1 mile north of Jewell, Lyons Creek, 1 mile north of Jones Point, 1 mile 

 south of Chesapeake E. E. Bridge. 



Collection. — Maryland Geological Survey. 



