THE SCIENTIST. 
35 
Jy one half >he total length, elevated, 
semi-rrian^>:uliir, or even tippronching the 
!;jemi-elliptical ; anterior width aqual to 
length; surface, smooth; margin broad, 
posterior width being about one sixth 
the length, but taper to one tenth of the 
anterior lateral extremities. Axal lobe 
arched in the center and slightly flat- 
tened at the sides, terminating wdth 
broad deep furrows; width of axal lobe 
about equal to lateral lobe without the 
border, and tapering to an' obtuse termi- 
nation, posteriorly. Annulations twenty- 
three, vertical on the side, but having a 
slight anterior curve on the dorsum 
n here they are distinctly marked, be- 
coming less pronounced on the sides, and 
terminating abdruptly on the margin of 
the broad longitudinal furrows. Each 
segment is studded with a single node at 
its extremities, on the margin of the 
longitudinal lateral furrows, thus form- 
ing a row of nodes along each side of the 
axal lobe. These nodes decrease in size 
toward the posterior, but the annulations 
become better defined. Lataral lobes 
curving downward to the broad margin; 
annulations twelve, forming a reverse 
backward curve, and becoming obscure 
in the broad margin. 
The only difference betwen the pygi. 
dium of this species and that otPhillip- 
sia mojor^ by Shumard, is the row of 
nodes along each side of the axal lobe. 
Dimoisions; length, 2.4 inches; cephalon. 
0.8 inches; thorax, 0.5 inches; pygidium, 
1.1 inches. See Fig. 7', slightly reduced. 
Locality: Oolitic limestone, layer 87 
by Broadhead's general section of the 
Coal Measure rocks of Missouri. 
Phillipsia major, Shumard. 
Plate I. figures 5 and 8 (a, b, c). 
This trilobite was described by Prof. 
S humard in 1858 from the pygidium 
only. Several complete specimens have 
been fund in the Upper Coal Measure 
rocks at Kansas City, and they are un- 
doubtedly idertical v\ iih HalTs Proetiis 
I cr<gicndus described in the 7th N. Y. 
PalfTeontology. Prof. Hall says that this 
specimen may ultimately prove to be a 
Carboniferous fossil, as its geological 
horizon was indefinite; it was found 
about thirteen or fourteen miles north- 
west of Toronto, in Greenwood County, 
Kansas. The writer made a geological 
examination of this locality, some two 
years ago, and obtained a number of 
characteristic fossils of the Upper (Joal 
Measure Group, among them were Mya- 
lina subquadrata, Lophophyllum prolif- 
erum^ FistuUpora nodulijeras, portions of 
the Delocrinus a genus recently described 
by Miller and Gurley; all were obtained 
from the same horizon and locality as 
the trilobite in question. 
Similarities and differences :-The num- 
ber of annulations of the axal lobe in the 
Fhillipsia major being twenty-three, 
while those of the Froetus longicaudus 
is twenty-two, which is not an unusual 
variation of the Fhillipsia mojor^ some 
specimens having only twenty. 
Fhillipsia major ^ width of the pygidium 
slightly greater than length, while in 
Froetus longicaudus^ the width equals the 
length : of six specimens of the former 
examined, the following results were 
obtained: two, width greater than length; 
one, width equal to length and three 
width less than length. 
Admitting these variations of the lat- 
ter, and the corrected geological position 
of the former, Froetus longicaudus must 
be a synonym for Fhillipsia major. 
Phillipsia cliftonensis. 
Plate I. Fig. 6. 
This trilobite has been found in the 
Upper Coal Measure Group of Kansas 
City, and corresponds with the descrip- 
tion of this species by Prof. Shumard; it 
is distinguished from Fhillipsia scitula, 
by fourteen annulations in the axal lobe 
