MARYLAND GEOLOGICAL SURVEY 361 



anterior pair of glabellar furrows starting from opposite the anterior 

 extremities of the eyes, directed obliquely backward and each one extend- 

 ing over a little more than one-third the width of the glabella; second pair 

 of glabellar furrows shorter and a little shallower than the first, directed 

 obliquely forward; third pair of glabellar furrows directed toward the 

 axis of the glabella for a short distance and then bending abruptly back- 

 ward and joining the occipital furrow, leaving the small, basal glabellar 

 lobes wholly detached. Occipital furrow rather deep and broad. Occipital 

 segment rather broad, its elevation about even with the glabella in front, 

 its posterior margin convex. Palpebral lobes prominent, their elevation 

 being nearly that of the glabella, separated from the glabella by the deep 

 dorsal furrow, and marked by a conspicuous furrow just within the 

 border of the eye. Eyes large, lunate, their inner margins elevated nearly 

 or quite to the height of the glabella, their anterior ends opposite the first 

 glabellar furrows and their posterior ends reaching nearly to the occipital 

 furrow. Cheeks, outside the eyes, sloping rather abruptly to the lateral 

 margins of the head ; marked along the posterior margins to a point about 

 one-half the distance from the eye to the margin by the narrow, but rather 

 sharply impressed, occipital furrow, whose distal extremity is rather 

 abrupt; the lateral borders marked by an ill-defined marginal furrow, 

 which originates at the outer extremity of occipital furrow, and after 

 passing forward nearly parallel with the margin, joins the dorsal furrow 

 just in front of the eye. 



" Pygidium subtriangular in outline, rather abruptly rounded or sub- 

 angular posteriorly. Axis prominent, but rather narrow, its margin 

 slightly incurved and abruptly rounded behind, marked by from eight to 

 ten somewhat sinuous annulations ; the pleurae slightly flattened adjacent 

 to the axis, but soon curving rather abruptly to the lateral margins, 

 marked by about six grooved segments, with slight traces of others 

 posteriorly. 



" Surface of the glabella, palpebral lobes, occipital segment and cheeks 

 inside the marginal furrow distinctly pustulose, the little tubercles being 

 more or less irregular in size; upon the cheeks outside the border of the 



