352 SYSTEMATIC PALEONTOLOGY 



Occurrence. CONOCOCHEAGUE LIMESTONE. Near Scotland, Franklin 

 County, Pennsylvania. Near Funkstown, Maryland. 



Collections. Maryland Geological Survey, U. S. National Museum. 



Family PROETIDAE 



Genus PROETUS Steininger 



PROETUS LATIMAEGINATUS Weller 



Plate LI, Figs. 21-25 



Proetus latimarginatus Weller, 1903, Geol. Surv. New Jersey, Pal., vol. iii, 

 p. 195, pi. xiv, figs. 17-24 (?25). 



Description. " Head sublunate in outline, the genal angles produced 

 into long, sharp spines. Glabella elevated, broadly subconical, rounded in 

 front; lateral furrows nearly obsolete exteriorly, but sometimes their 

 position is indicated by dark lines on the surface, which seem to indicate 

 an internal thickening of the test; the two anterior pairs are short and lie 

 in front of the eye-lobes ; they are close together, and are directed obliquely 

 backward from the margin of the glabella; the posterior pairs are more 

 conspicuous than the others, and are sometimes marked by slight depres- 

 sions ; they are situated a little in front of the middle of the eye-lobes, and 

 are directed obliquely backward from the margin of the glabella, becoming 

 more curved posteriorly, joining the occipital furrow at nearly right 

 angles. The dorsal furrow well defined throughout. Occipital furrow 

 sharply impressed, deeper than the dorsal furrow. Occipital segment 

 with subparallel margins, scarcely as highly elevated as the glabella, 

 marked by a small, rounded tubercle at its central point. Palpebral lobes 

 of moderate width, sub-semicircular in outline, depressed below the level 

 of the glabella. Facial sutures curving into the margin of the glabella, 

 both in front and behind the palpebral lobes; posteriorly they intersect 

 the margin of the head close to the axial lobe; in front of the palpebral 

 lobes they curve outward nearly to the margin of the head, where they 

 make a rather sharp bend and recurve inwardly, intersecting the anterior 

 margin at some distance from its median point. Anterior limb of the 

 cranidium broad, with a convex marginal border, between which and the 



