Contributions to Palceontology. 



137 



there well-marked ocular ridges, and the palpebral lobe is 

 not observed to be distinctly limited by a groove, except 

 in C. anatinus. In the latter character there is no depart- 

 ure from typical Conocephalites ; but in the course of 

 the suture-line in front, there is a departure from the re- 

 cognized species of that genus. 



The species thus grouped are the C. perseus, C. shumardi, 

 C. nasutus, C. oweni, C. ergon, C. anatinus, and C. jpatersoni. 



Among the remains of some of these species we find 

 the "doublure " or lower border of the frontal limb, sepa- 

 rated as a single piece ; presenting a feature somewhat 

 similar to the corresponding part of Paradoxldes, except 

 that its continuity on the posterior margin is not broken 

 by the attachment of the hypostoma. This portion of the 

 front, however, has a distinct, central, vertical suture, as 

 in Asaphus (See fig. 38 a, Plate n). 



Should the species possessing these features be found to require 

 separation from Conocephalites, I would propose the name 

 Conaspis. 



CONOCEPHALITES PEKSETJS (n. s.). 



PLATE II, FIGS. 17-23; AND PLATE III, FIG. 33. 



Glabella cylindrico-conical, gibbous, rounded at the an- 

 terior extremity. Glabellar furrows very distinct ; the 

 posterior furrows oblique and deeply impressed, and ex- 

 tending across the glabella: the second furrows are 

 nearly rectangular to the axis, distinct at the sides, and 

 extending almost across the glabella ; anterior furrows 

 obscure or obsolete, and close to the anterior extremity, 

 the anterior lobe very short. Occipital furrow com- 

 paratively deep, curving forward in the middle and at 

 the extremities : occipital ring as high as the posterior 

 part of the glabella, or sometimes a little higher. Dorsal 

 furrow sharply and neatly defined, and its continuation 

 in front almost as well marked as at the sides. 

 [Trans v.~] 18 



