OF DENISON UNIVERSITY. 
59 
is continued for a short distance almost transversely, the other bends 
back nearly to occipital sinus and, with the main branch, partially 
encloses a large oval lobe on either side, the lobes [basal lobes] sep- 
arated by a space about one-half width of glabella ; middle pair of 
furrows shallow, curving backwards in a direction nearly parallel with 
the posterior ones, but considerably shorter, anterior pair feebly im- 
pressed, a little oblique ; occipital sinus a little convex toward the 
front, shallowest in the middle ; occipital ring [neck-lobe] wide, 
flattened, much lower than the plane of glabella. Pigidium semi- 
circular, flattened convex, width double the length, margin broad and 
slightly concave; axial lobe almost as wide as the lateral lobes, 
rounded at the extremity, segments lo, separated by well-marked 
furrows ; surface thickly studded with granulse, which are rather smaller 
than those of the glabella. Length of head, 8^ lines; greatest width, 
7^ lines; length of pigidium, 6^ lines; width i inch. 
This species is also described from the Lithographic limestone 
said to be of Chemung age, but it occurs to in the VVaverly (sub- 
carboniferous) of Ohio, at Granville. As this species is certainly a 
Phillipsia the name was preoccupied by Phillipsia 7nissoiLriensis, 
Shumard, from Middle Coal Measures at Lexington, Mo., described 
in 1858, Trans. Acad. Sci., St. Louis. 
Phillipsia meramecensis , Shumard. 
Pigidium [only portion known] semi-elliptical, rather wider than 
long, very convex; 'border moderately narrow; axial lobe not quite as 
wide as the lateral lobes, and considerably elevated above them; an- 
terior extremity arched ; posterior extremity obtusely rounded ; rings 
13. convex on the dorsum, but shallow and narrow on the flattened 
sides; lateral lobes strongly arched downward; ribs about 12, indistinct, 
except the last two or three ; the first four from the thoracic margin 
marked by a shallow, but distinct furrow, which is situated very near 
the posterior edge ; furrows between the ribs rather deeply impressed. 
Surface very finely granulose. Length, six lines ; width, 6}4, lines.” 
Described from the so-called Archimedes limestone, in St. Louis 
Co., Mo. There is nothing characteristic about the pigidium de- 
scribed, though it may be readily distinguished from the previous one. 
Phillipsia inissouriensis , Shumard. 
Pigidium semi-elliptical, elevated, width greater than length ; sur- 
