Maryland Geological Survey 339 



of which project in some specimens and in internal impressions frequently 

 give the surface a pustulose appearance to the naked eye. 



The Maryland Collection contains two exfoliated specimens of pygidia 

 of moderate size belonging to this species. Both clearly show casts of the 

 tubulipores and one of them the upward suhspatulate extension at its 

 posterior end, the tip of the other being broken. The tubules of the 

 Maryland specimens are apparently closer together and the openings of the 

 tubulipores smaller than in the majority of New York specimens. The 

 outline and other characters of the specimens agree closely with those of 

 this species. Apparently the species is not common in Maryland and these 

 two specimens are preserved in rather coarse arenaceous shales quite sim- 

 ilar in lithologic appearance to shales in which they are most frequently 

 found in central New York. Later, a few additional specimens of this 

 species were found at other localities. 



Length of largest pygidium, the tip of which is gone, about 30 mm. ; 

 width, 42 mm. 



Occurrence. — Romney Formation, Hamilton Member. On road 

 east of Pine Hill about 4 miles north of Oldtown; Williams Road, 3-| 

 miles southeast of Cumberland; Williams Road i mile east of Queen City 

 Hotel, Cumberland; on Hancock-Harrisonville Road about 2 miles north 

 of Hancock ; west of iron bridge over Town Creek northeast of Oldtown ; 

 on east side Warrior Mt. east of Rush. 



Collections. — Maryland Geological Survey; New York State Museum; 

 American Museum of Natural History. 



Family PHACOPIDAE 



Genus PHACOPS Emmrich 



Phacops rana (Green) 



Plate XLIII, Figs. 8-12 



Calymene bufo var. rana Green, 1832, Mon. Trilobites N. A., p. 42. 

 Phacops bufo Emmons, 1860, Man. Geol., p. 138, fig. 124 (G). 

 Phacops rana Hall, 1861, Descriptions New Species of Fossils, etc., p. 55. 

 Phacops rana Hall, 1862, Fifteenth Rep. N. Y. State Cab. Nat. Hist., p. 93. 



