Marylaxd Geological Survey 493 



ing in posterior margin, extending directly and very obliquely inward and 

 forward to the palpebral lobes, thence directed obliquely outward and 

 forward to marginal sulcus where they curve sharply inward and forward 

 to the frontal margin. Glabella U-shaped, moderately and regularly con- 

 vex, bounded by a deep, well-defined sulcus which widens markedly near 

 the palpebral lobes; basal lobes pyriform, slightly alternate anteriorly, 

 oblique, conspicuous; baso-lateral furrows well marked, very convex on 

 inner side, antero-lateral furrows obsolete ; frontal area regularly convex 

 to marginal sulcus. 



Eyes large, very prominent, visual area semicircular, palpebral lobes 

 small. Cheeks small, sloping steeply to marginal sulcus; a well-defined 

 furrow running from base of genal angles obliquely inward and forward, 

 almost parallel to facial suture, to posterior extremity of palpebral lobe ; 

 occipital furrow narrow but sharply marked; occipital ring moderately 

 broad on axis, tapering laterally. Thorax elongate, subequally trilobate ; 

 segments thirteen ( ?) ; axis well arclied, but slightly depressed medially, 

 of same width to two-thirds or more of the distance from cephalon, then 

 tapering posteriorly; pleurge depressed on interior portions, abruptly 

 deflected distally ; each annulation bearing a longitudinal furrow which 

 runs from near the anterior side in the axial region obliquely to the middle 

 of the annulation, becoming obsolete distally ; the smaller anterior portion 

 of each annulation with a small spine at fulcrul line as in C. crespedota. 

 Pygidium not seen. Surface of cephalon smooth; that of the thorax 

 covered by small irregular pustules, which are more numerous on the axis. 



This species bears a close resemblance to C. crespedota of the Hamilton 

 of New York, but is quite distinct. C. ccelebs of the Lower Helderberg 

 of that state differs widely from this species especially in the features of 

 the axis of the thorax. Only a single individual of this genus has so far 

 been reported from the Lower Devonian of Maryland. The exact horizon 

 is unknown. 



Occurrence. — Helderberg Formatiox. Cumberland. 



Collection. — George M. Eoeder. 



[Ohern.] 



