742 THE PALEONTOLOGY OF MINNESOTA. 



ICybele wlnchclll. 



Genus CYBELE, Loven, 1845. 

 CYBELE WINCHELLI, n. sp. 



There is a single extended individual of this genus, considerably defaced about 

 the head, so that the glabella is wholly lost; but the outline and proportions of the 

 cephalon and the structure of the other parts are preserved. General outline 

 linguate, tapering from the head backward to a subacute extremity; axial length 



Fig. 59. Cybele winchelli. 



36 mm., greatest width 26 mm. Surface convex, flattened above. Cephalon transverse, 

 broadly rounded at the sides, somewhat concave on the frontal margin which was 

 slightly elevated. Length 10 mm.; width 26 mm. As the structure of the glabella 

 is lost, a figure is here introduced copied from one of Schmidt's drawings of 



Fig. 60. Cephaloa of Cybele bellatula (after Schmidt). 



C. bellatula Dalman. This shows the three distinct pairs of lateral lobes, the rather 

 small frontal lobe and the peculiar projection of that portion of the shield lying 

 between the upper anterior extremities of the facial sutures. 



Eye-nodes large and elevated, situated near the transverse diameter of the shield 

 and directed somewhat anteriorly. Facial suture taking its origin on the outer margin 

 considerably above the genal angles, whence its course may be traced as far as the 

 eye-node. Margin of the cephalon thickened, convex and somewhat spreading 

 on the ante-lateral limb, receding and becoming concave posteriorly, thence 

 produced into rather short divergent genal spines. Occipital ring and groove well 

 marked. 



Thorax subquadrate, tapering; 20 mm. in width at the anterior extremity; 

 8 mm. in width at the posterior extremity; length 20 mm. Composed of twelve 

 segments. Axis proportionally narrow and convex throughout, having about 



