288 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



divided by one distinct ridge, leaving on each side a shallow groove, with 

 a secondary and less distinct ridge close to the margin. Glabella promi- 

 nent, longer than broad, gently rounded and narrowing in front, touching 

 the first ridge. Occipital furrow narrow, flanked at either end by two 

 conspicuous nodes. Occipital ring stronger than any rings on the thorax. 

 Lateral lobes marked by furrows, the anterior on a level with the ante- 

 rior portion of the eye. the middle close and parallel to it, both gently 

 curving downward, while the posterior starts opposite the centre of the 

 ej'e, bifurcating, one arm produced toward the inner edge of the nodes, 

 the other pointing directly across the glabella. Eyes prominent, cling- 

 ing closely to the glabella, and extending nearly one-half its length. 

 The facial sutures in their anterior extension curve outwardly from tht 

 eye, reaching the border so as to divide it into three nearly equal parts. 

 Thorax having ten segments. Mesial lobe prominent, semi-circular, its 

 anterior portion very little narrower than the lateral lobes; these tra- 

 versed by a sharp angular ridge, from which on each side the descent is 

 very conspicuous. Pygidium wider than long. Axis prominent, com- 

 posed of nine or ten well-detined rings, tapering gently almost to a point, 

 scarcely reaching the border. On the lateral lobes are seven or eight 

 annulations, less and less distinctly marked as they approach the termi- 

 nation of the axis. Posterior margin bearing traces of two ridges, such 

 as distinguish the anterior margin. The whole surface rinely granulose. 

 Fig. 9 represents the head with glabella and spines ; also the thorax. 

 The artist, in endeavoring to give expression to ^he two ridges, has 

 slightly exaggerated the breadth of margin. In the Cabinet of the Col- 

 lege is a specimen of the cephalic shield alone, while in the collection of 

 Prof. Pratt is another, showing head, pygydium and shield ; on both the 

 facial sutures are more plainly shown than on the specimen figured. 

 Found in bed Xo. 2. The original of specimen figured was presented to 

 the Academy by the writer. 



[An error occurs in the third sentence of the description of Stereocrinus triangulatus . 

 Instead of reading " whose sides are parallel to those of the anchylosed basal plate" read " the 

 angles of which are equi-dijtaut from the angles of the inscribed pentagon forming the base."] 



Dr. Farquliarson then read the following paper: 



Exploration of a Mound near Moline, Ills. 

 BY J. GASS AND R. J. FARQUHARSON. 



The mound was about three miles above Moline, and was situated on 

 the brow of the elevated plateau. Before the growth of the rather small 

 trees now covering the spot, it must have overlooked the Mississippi river 

 and its valley, here several miles wide. The mound w^as circular, with a 

 circumference of one hundred and fifty feet, and a central elevation of 

 nearly seven feet. Near the centre, a pit some eight feet in diameter and 

 six feet deep had been sunk some days before our visit, so that we had 

 but little digging to do in order to expose the contents of the mound, if 

 any were to be found. In sinking the pit human bones were encoun- 



