NATURAL SCIENCES OF PHILADELPHIA. 63 



while those of the other two are directed more obliquely backward, particu- 

 larly the posterior one, which is almost parallel to the longitudinal axis of 

 the body. These furrows are so deep and broad as to give the three ments 

 of each lateral lobe the appearance of six irregular ridges, the irregularity 

 being produced by the posterior two segments instead of passing along the 

 middle of each segment, being curved backward so as to divide these seg- 

 ments very unequally, leaving the anterior part much broadest. No fine sur- 

 face markings are preserved on the specimen. 



Entire length of the imperfect specimen, 2-75 inches, of which remaining 8 

 thoracic segments form 1-70 inch; breadth of the thorax, exclusive of tbe 

 free spiniferous ends of the pleura?, 2-05 inches, and including the projecting 

 ends of the pleura?, 2-40 inches; length of what remains of the pygidium, 1-03 

 inch ; breadth of do., about 1-80 inch. Supposing it to be a true Paradox- 

 ides, with not less than sixteen thoracic segments, the entire specimen, when 

 complete, could not have been far from six inches in length. 



It is possible I should call this species Olenus or Conocoryphe Nevndemis, 

 but its large size seems to be an objection to placing it in any section of either 

 of these genera. In the possession of a node or spine on each of the thoracic 

 segments, as well as in the direction of the posterior segments of the lateral 

 lobes of the pygidium, it agrees with the type of Parabolina, but unfortunately 

 the specimen is not in a condition to show whether or not these segments of 

 the pygidium terminated in produced marginal spines, while the furrows of 

 its pleura have not the obliquity of those seen in that type, but agree more 

 nearly with those of some species of Conocephalites. The comparatively large 

 size of its pygidium, and the nodes or spines on its thoracic segments, as well 

 as the nature of the furrows of the pleura?, are rather against its reference to 

 Paradoxides, and lead me to think that it may belong to an undescribed genus. 



Conocoryphe (Conocephalites) Kingii, Meek. 

 Entire form ovate, and much depressed, with breadth equaling about two- 

 thirds the whole length. Cephalic shield semicircular, or a little wider than 

 long, with the anterior and antero-lateral borders regularly rounded in out- 

 line, and provided with a narrow, slightly defined marginal rim ; posterior 

 margin nearly straight, with the lateral angles terminating in abruptly pointed 

 extremities, so short as scarcely to project as far backward as the posterior 

 margin of the second thoracic segment. Glabella depressed nearly even with 

 the cheeks, about two-thirds as long as the entire head, and between one-third 

 and one-fourth the breadth of the same behind, but narrowing forward to its 

 subtruncated anterior end, and separated from the cheeks on each side and in 

 front by a shallow furrow ; occipital furrow moderately well defined, and con- 

 tinued as rather deep broad furrows along the posterior margins of the cheeks 

 out nearly to the points where the facial sutures cut the margin ; lateral fur- 

 rows not clearly defined in the specimens, but apparently consisting of four 

 pairs. Facial sutures directed at first, for a short distance, forward from the 

 inner anterior end of each eye, then curving gracefully outward as they ex- 

 tend forward, until near the anterior margin of the head, where they arc a 

 little wider apart than the distance between the eyes, but again curving rather 

 abruptly inward, so as to reach the anterior margin nearly on a line with each 

 eye; posteriorly these sutures extend at first outward, nearly at right angles 

 to the longitudinal axis, from the posterior end of each eye, and then curve 

 gracefully backward so as to intersect the posterior margin between one- 

 fourth and one-third the distance from the lateral angles, inward toward the 

 glabella. Eyes rather depressed, slightly arched outward, and separated irom 

 each other by a space somewhat less than half the entire breadth of the head. 

 and placed less than their own length in advance of the posterior margin, and 

 about once and a half their length behind the front margin of the head ; vis- 

 ual surfaces narrow, and not showing any lenses under a good magnifier 

 Thorax with its length bearing the proportions to that of the head, of 79 to 



1870.] 



