222 SIXTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 

 AMPHION? MATUTINA (n.s.). 



PLATE V A. FIG. 6. 



Glabella gibbous, longer than wide, subovate, rounded and a 

 little wider in front. Occipital ring narrow and straight ; occi- 

 pital furrow narrow. Posterior lobe a little oblique, the furrow 

 deeply impressed and a little expanded at its inner extremity : 

 median lobe with the sides nearly parallel, separated from the 

 anterior lobe by a narrow distinct furrow ; anterior lobe broad, 

 the length somewhat less than half the entire length of the 

 glabella, a scarcely defined depression extending obliquely from 

 near the middle of its length to the front. 



A part of one of the fixed cheeks remaining is semielliptical, a little 

 wider behind than in front. 



The specimen is too imperfect to admit of tracing the facial suture. 



CONOCEPHALITES? (ARIONELLUS?) DORSALIS (n.s.). 



Several small specimens have been observed, preserving the glabella and 

 fixed cheeks. 



Glabella moderately gibbous, minute, truncate-conical, a little 

 wider at base than the length from the occipital farrow, Avith 

 two distinct slightly oblique furrows, the posterior ones most 

 oblique, and reaching about one-third across the glabella : oc- 

 cipital furrow narrow and well defined ; occipital ring wider, 

 more prominent in the middle, and produced into a node (which 

 in the crust has probably been a short spine). Dorsal furrow 

 well defined, and continuing of the same width and strength 

 in front. Fixed cheeks a little wider at base, prominent, and 

 continuing in a convex border in front. 



The specimens have the form and aspect of Arionellus hipunctatus ; but 

 the glabella is more distinctly lobed, and the puncta at the anterior angles 

 do not exist in this one. 



CONOCEPHALITES OPTATUS ( n. s.). 



PLATE V A. Fia. 7 [Figure six times enlarged]. 



Specimens retaining the glabella and fixed cheeks have been observed. 



Glabella narrow conical, and rounded anteriorly. The posterior 

 lobe is small, oblique, and nearly separated from the glabella : 

 the middle lobe is oblique, and longer than the posterior one ; 

 anterior lobe less distinct. Occipital furrow narrow and well 

 defined : occipital ring rounded, prominent, and a little more 

 elevated than the summit of the glabella. 



The glabella slopes to a broad depression in the frontal limb, which is 

 terminated by an abruptly elevated border. The posterior limb of the fixed 

 cheek is much extended laterally ; and the facial suture approaches the 

 glabella near the front, where the fixed cheek preserves a little elevated 

 ridge like a palpebral lobe. 



This species is interesting in preserving the peculiar characteristics of the 

 Genu3 CONOCEPHALITES, and also approaching the C. sulzeri of Europe. 



