a~c 



20 PALAEONTOLOGY. 



ARTICULATA. 



CRUSTACEA. 



PARADOXID^. 



Genus CONOCORYPHE, Corda. 

 OoNOCOBYPHE (Ptychopaeia) Kingii, Meek. 



Plate 1, fig. 4. 



Conocoryphe (Conocephalites) Kingii^ Meek (1870), Proceed. Acad. Nafc. Sci. Philad., 63. 

 Conocoryplie [Ptyclioparia) Kingii, Meek (1872), Hayden's Ann. Keport U. S. Geol. 



Survey of the Territories, 487. — White (1876), Palseont. of Lieut. Wheeler's 



Survey, 40, pi. ii, figs. 2 ah, c. 



Entire form ovate and much depressed, with breadth equahng' 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 

 outline, 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. Grlabella 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 for- 

 ward 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 continued as rather deep broad furrows along the posterior mar- 

 gins of the cheeks out nearly to the points where the facial sutures cut 

 the margin ; lateral furrows not clearly defined in the specimens, but appar- 

 ently 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 extend forward, until near the anterior margin 

 of the head, where they are a little wider apart than the distance between 

 the ayes, but again curving rather abruptly inward, so as to reach the ante- 

 rior 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 pos- 

 terior end of each eye, and then curve gracefully backward, so as to intersect 



