24 PROCEEDINGS OF THE ACADEMY OF 



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 223 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 mast 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 strife. Glabella elongate-paraboloid, tuber- 

 culated. In the middle of the 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 down 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. trancatiilus, Phil- 

 lips, sp. (Geol. Yorks, ii. p. 240. pi. xxii. fig. 13.) but the head is widely dif- 

 ferent. 



From the base of the Burlington limestone. 



Phillipsia Maramecensis ? 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, PL B. fig. 9,) simply in consequence 



[Jan. 



