438 Systematic Paleontology 



FASCIOLARIA ? JUNCEA 11. sp. 



Plate XIV, Fig. 12 



Description. — Shell slender, fusiform, the maximum diameter falling 

 decidedly in front of the median horizontal ; whorls probably about six in 

 number, closely appressed, flattened, regularly increasing in size, converg- 

 ing at an angle of not far from 10° ; body whorl abruptly constricted at 

 the base; external surface sculptured with sharply rounded, somewhat 

 arcuate axial riblets numbering 12 or 13 to the whorl, persistent from 

 suture to suture and evanescing on the ultima about half-way across the 

 base ; spiral sculpture of faint linear striations, twelve in number on the 

 later whorls of the spire and double that number upon the body; pillar 

 closely threaded with some twenty lirse; characters of aperture obscured 

 by the matrix, probably narrow with a thin arcuate labrum and a strongly 

 concave, non-plicate labium ; anterior canal slender, straight and probably 

 rather long. 



Dimensions (imperfect individual). — Altitude 20 mm., maximum 

 diameter 7.3 mm. 



Occurrence. — Monmouth Formation. Brightseat, Prince George's 

 County. 



Collection. — Maryland Geological Survey. 



Fasciolaeia (?) sp. 

 Plate XIV, Fig. 11 

 Description. — The spire of a large univalve, fusoid in outline, was col- 

 lected at Brightseat. The whorls probably numbered eight to ten and 

 increased rather slowly in size. They are very closely appressed, the width 

 of the fasciole being not far from a fifth of the width of the entire whorl. 

 The most striking feature is the axial sculpture, the costa? being narrow, 

 rounded upon their summits and very prominently elevated, numbering 

 about twelve to the whorl and separated by slightly wider intercostal areas. 

 They are uniform in strength from the fasciole to the anterior suture and 

 are apparently overrun by a fine spiral liration, although the surface is 

 so weathered that the details of the sculpture are largely obliterated. The 



