24 
PROCEEDINGS OE THE ACADEMY OE 
about 11°, rapidly increasing with the growth of the shell to 35° or 40® ; 
transverse section laterally compressed, with the dorsum a little more acute 
than the venter ; last chamber fully half the length of the shell. Septa 
transverse, regularly concave. Siphon rather large, terete, somewhat close to 
the dorsal margin. Surface apparently without ornaments ; incremental lines 
forming a variable angle with the septa. 
A specimen which is 2-23 long is "38 in dorso-ventral diameter at the small 
(imperfect) end, and 1*60 at the larger end, being septate the whole length. 
Another specimen must have been about 2-3 in dorso-ventral diameter at the 
larger end. 
PHILLIPSIA, Portlock. 
Phillipsia insignis, n. sp.—Head paraboloid; border wide, broadly and 
deeply furrowed, with the margin reflected upward, and the lateral angles 
continued posteriorly in acuminate prolongations, reaching twice the length of 
the glabella from the anterior end ; the margin and reflected portion of the 
test marked by fine longitudinal strize. Glabella elongate-paraboloid, tuber- 
culated. In the middle of tile posterior border of the glabella is a pair of tu¬ 
bercles, and in front of these a second and third pair, the last resting on the 
middle of the glabella—the whole so arranged as to form two longitudinal 
rows ; opposite the first pair are the two small complementary lobes, with 
four pustules on the summit of each; opposite the second pair, on each side, 
a transversely elongate tubercle with a trifid crest; opposite the first pair, a 
similar tubercle with a bifid crest; the ornaments on the posterior half of the 
glabella being consequently arranged in three transverse series, in the posterior 
of which are ten elevations, in the middle eight, and in the anterior six; the 
anterior half of the glabella is covered by pustules somewhat promiscuously 
arranged, and varying in different specimens. Eyes large, globoid, slightly 
excavated by the palpebral lobe of the fixed cheek, situated opposite the pos¬ 
terior third of the glabella. Occipital ring broad, with its posterior margin 
elevated nearly as high as the posterior extremity of the glabella, and orna¬ 
mented with a row of small, raised points turned backwards. Pygidium very 
convex, semielliptic, the axis very prominent and forming about one-third 
the width at the anterior margin ; consisting of twelve to fourteen rings, each 
bearing six small tubercles, the whole of which are arranged in six longitudi¬ 
nal rows ; the tubercles often worn dow r n on the exterior of the test, but 
always well defined in the cast; lateral lobes bent rather abruptly downwards, 
having ten ribs, which become indistinct and disappear toward the margin, 
and are entirely wanting over the narrow space behind the axis ; the anterior 
ribs showing a faint median groove toward their vanishing extremities, and a 
a few of the posterior ones bearing feeble tuberculations toward their axial 
extremities. 
The pygidium of this species nearly resembles that of P. truncatulus, Phil¬ 
lips, sp. (Greol. Yorks, ii. p. 240, pi. xxii. fig. 13.) but the head is widely dif¬ 
ferent. 
From the base of the Burlington limestone. 
Phillipsia Makamecensis ? Shumard.—Border of head of medium width, 
regularly convex, separated from the glabella by a narrow, distinct furrow. 
Glabella oblong, slightly quadrangular, a little broader behind than before, 
convex, highest in the middle ; complementary lobes obliquely oval, protrud¬ 
ing a little beyond the lateral boundaries of the glabella, from which they 
are separated by shallow depressions ; a diminishing series of three feeble 
lobes in front of each complementary lobe ; surface of glabella smooth to the 
naked eye, but under a lens finely granulated. Eyes opposite the last quarter 
of the glabella. 
The fragment above described is associated with the pygidium described by 
Dr. Shumard, (Mo. Rep. Part ii. p. 199, PI. B. fig. 9,) simply in consequence 
[Jan. 
