158 SIXTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 



This description of the species is taken from numerous specimens ob- 

 tained at Trempaleau ; while a single specimen from near Lacrosse ( Plate 

 viii, f. 31), with the same proportions, has the glabella more bent down- 

 wards in front, and the sides are more indented by the furrows, only two 

 of which are distinctly seen. The fixed cheeks are precisely as in the 

 Trempaleau specimens. 



A separate cheek, apparently of this species, is subtriangular, depressed 

 convex, a little prolonged in front and apparently obtuse behind, with a 

 thickened border and small eye. 



A pygidium, associated with these specimens, is short and wide, with a 

 strong prominent axis, which has three distinct annulations besides the 

 anterior one, with two or three distinct ribs on the lateral lobes. The entire 

 width is 0.47 of an inch, and the length 0,21 ; the axial lobe being 0.19 

 of an inch wide, 



CONOCEPHALITES ANATINUS ( n. s,). 



PLATE VII, FIGS, 34 k 35 ; AND PLATE VIII, FIG. 29. 



Glabella depressed-convex, subovate-conical, slightly subangular 

 along the middle, rounded anteriorly, the sides curving, the 

 base nearly straight, leugth a little greater than the width at 

 base. Furrows shallow and often indistinct : occipital furrow 

 narrow and shallow ; occipital ring comparatively^ wide, flat- 

 tened on the top, a little higher than the base of the glabella ; 

 dorsal furrow shallow, and continued in front of the glabella. 

 Facial suture making a gentle curve outwardly from where it 

 cuts the contour in front, and thence nearly straight to the 

 anterior margin of the palpebral lobe, and slightly curving 

 outwards again returns beneath the eye, almost to the dorsal 

 furrow, and then turns very abruptly outwards. 

 Fixed cheeks very narrow, spreading a little in the middle, and 

 separated from the elongate palpebral lobe by a sliallow groove : 

 posterior limb narrow. Frontal limb extended, with a shallow 

 depression close to the glabella, beyond ^hich it is very gently 

 convex and rounded at the extremity. 



This species is peculiar, and very well marked in the curving 

 anterior margin of the frontal limb, the elongate palpebral lobe, 

 and the shallow narrow dorsal furrow, which is sometimes scarce- 

 ly distinct. 



Associated in the same specimens with these glabellas there are several 

 movable cheeks and other parts of the body, which may belong to this 

 species. All the cheeks have the facial suture terminating at some distance 

 within the posterior angle, which is extended in a long curving spine. The 



