Maryland G]:oi.o(;ical Survey 681 



Occurrence. — Jennings Formation, Parkhead Member. Two miles 

 north of mouth of Town Creek, 1716. 

 Collection. — Maryland Geological Survey. 



HOLOPEA ? sp. 



Description. — An imperfect specimen possibly of the genus Holopea 

 was found at Town Creek. The shell is subglobose, conical, body volu- 

 tion greatly inflated, number of volutions unknown, sui'face smooth. 

 The body volution of this species is unusually ventricose. The specimen 

 observed is too imperfect to permit illustration. 



Occurrence. — Jennings Formation, Chemung Member. Town 

 Creek, 4769. 



Collection. — -Maryland Geological Survey. 



Family CAPULIDAE 



Genus ORTHONYCHIA Hall 



Orthonychia prosseri n. sp. 

 Plate LXX, Figs. 4-6 



Description. — A single small and apparently somewhat appressed 

 specimen is the only example of the species observed in the Jennings 

 formation. With the known individual variability of these shells it 

 would be hazardous to apply any name to this form were it not for the 

 fact that no species is recorded from the Chemung fauna elsewhere. It 

 may be characterized as follows : 



Shell laterally compressed, nuiking one and one-half to two volutions; 

 early growth decidedly flattened and subcarinate ; expanding abruptly 

 to the aperture and becoming subconvex above but depressed or concave 

 below. Aperture much elongated and narrow, fluted below near the 

 inner lip. 



Height 15 mm. 



Occuri-encc: — Jennings Formation, Chemung ]\Iember. Oakland- 

 Altamont Eoad; National Road 6 miles west of Frostburg. 



Collection. — Maryland Geological Survey. 



