54 A Contribution to the Lower Devonian Faunas of Maryland 



Subgenus SYNPHORIA 



Dalmanites (8ynpiioria) stemmatus Clarke 



Plate XCIII, Fig. 3 



Dalmanites (Synphoria) stemmatus Clarke, 1900, Mem. N. Y. State Mus., 

 vol. ill. No. 3, p. 15, pi. i, figs. 6-16; pi. ii, figs. 1, 2. 



Description. — " Species attaining considerable size. Cephalon convex, 

 abruptly sloping to the genal margins. Genal extremities somewhat pro- 

 duced but relatively short and terminating in broad obtuse angles. Dorsal 

 furrow deep except at the junction of the glabellar lobes with the palpebral 

 lobe, where it becomes shallow and very much elevated. Frontal lobe of 

 glabella large, rounded in front, slightly elongated at the axial extremity, 

 but not projecting beyond the frontal border or facial suture. First lateral 

 furrows long, deep and oblique, extending nearly three-fourths the 

 diameter of the lobe. Glabellar surface l)ehind the frontal lol)e slightly if 

 at all depressed medially. Second and third lobes wholly confluent at their 

 extremities, often but a remnant of the second lateral furrows remaining. 

 Together these coalesced lobes have a subtriangular or subclavate outline 

 and are convex and elevated at their distal extremities, rising above the 

 full height of the glabella and almost to the height of the palpebral lobe. 

 The third lobes are small and narrow, making an annular segment, varying 

 but little in width; their extremities are almost concealed beneath the 

 projecting lobes in front. Occipital furroAV deep ; occipital segment long 

 and very much arched; no central spine or tubercle. Cheeks with steep 

 lateral slopes ; someAvhat concaA e Avithin the thickened margin. Furrows 

 beneath the eyes deep, narroAv Avith elevated margin having a vertical, 

 outAvard slope. Occipital furrow widening from the dorsal furrows out- 

 ward and coming to a rather abrupt termination Avithout meeting the sub- 

 marginal depression of tlie (hceks or extending on the genal expansion. 

 Eyes large, elevated, the palpel)rum higher than the palpebral lobe. 



" The thickened border bears a roAV of crenulations or crescentic orna- 

 mental processes, Avhich are the most extended at the anterior extremity; 



