A Contribution to the Lower Devonian Faunas of Maryland 49 



C'ephaloii convex depressed, havino- the shape of a flaring U, lateral Imes 

 rectilinear, making with each other an angle of about 54°, anterior margin 

 somewhat broadly rounded. Length to width about as 2 to 3 ; genal angles 

 rather abruptly but regularly rounded. Facial sutures originating in 

 genal angle nearer the lateral margin, thence running obliquely forward, 

 rounding and passing inward parallel to posterior margin of cephalon 

 toward points posterior to the eyes, thence again obliquely inward to the 

 eyes, thence forward to anterior margin. Ko transverse suture observed, 

 but may be present. 



Glal)ella subescutcheonoid, broader posteriorly, lateral margins almost 

 rectilinear, but slightly concave outw^ards, anterior angles rounded, pos- 

 terior angles sliarp, length five-eighths, or less, that of the cephalon, 

 lateral furrows undefined in specimens observed. Cheeks free, sinuous 

 on surface and abruptly deflected marginally. Eyes situated on large 

 elevated protuberances which are slightly elliptical parallel to the lat- 

 eral margin of the cephalon and each Iwunded by a wide shallow furrow 

 which is less definite adjacent to lateral margin of the cephalon. Visual 

 areas small, nearly circular, but slightly elongate parallel to the longer 

 axis of the protuberances upon which they are situated. 



The description is from two specimens belonging to the U. S. National 

 Museum from near Franklin, Pendleton County, West Virginia. One 

 shows the genal angles well, but neither has the anterior extremity of the 

 cephalon. So far as the writer knows these two specimens and a fragment 

 in the Xew York State jVfuseum are the only specimens of the cephalon 

 of this species yet discovered. 



Occurrence.— OmsKA^Y Formation, Ridgely Member. Knobly 

 ^Mountain near Cumberland, Maryland; opposite Franklin, West Virginia. 



Collections. — Maryland Geological Survey, U. S. Xational Museum. 



Family PHACOPIDAE 



Genus F^HACOPS Emmiich 



Phacops logani Hall 

 Plate XCl, Figs. 1-4 



Phacops logani Hall, 1859, Nat. Hist. N. Y., Pal., vol. ill. p. 353, pi. Ixxiii, figs. 



15-25, 1861. 

 Phacops logani Weller, 1903, Pal. N. J., vol. ili, p. 231, pi. xl, figs. 3, 4. 



