(JarboniferoKS Trllob}te!<. IJl 



nijrrower than the axis, and their lerminal points Join the ex- 

 tremity of the axis. The pygidiiHii is bordered by a plain belt 

 curved downward around the margin, and barely marked by a 

 conlinuation of the articulations — except the two which bound 

 it anteriorly. 



••Number of segments in the axis, 11; in the side lobe, 7; 

 surface the same as in the buckler. 



•' Width of pygidium, .35 inch ; length, .21 ; width of axis at 

 anterior end, .12; width of border, .04; length of buckler of 

 another specimen, 31." 



Geological i^oi^ition and locality. — Goniatite limestone (Wa- 

 verly series), Kockford, Indiana. 



PHILLIPSIA KOCKFOKI>ENSIS, TVinchell. 



PhilUpsia Roclfordeiisis, Winchell, 1865, Proc. Acad. Nat. Sci. Phila., 



Vol. IX. 2d series, p. 188. 

 PJiilUima Rockfordensis, Herrick. 1887, Bull. Sci. Lab. Denison Uuiv., 



II, p. 62. 



Prof. Winchell gives the following description of this species : 

 'Cephalic shield surrounded by a narrow, convex border, which is 

 bounded internally by a narrow but deep groove, and terminates posteriorly 

 in conically tapering genal points. The principal lobe of the glabella is 

 relatively very large, convex, hig'iest in the middle, widened anteriorly, 

 circularly rounded in front, and gently curved on the sides ; no glabella- 

 f urrows are present. The complementary lobes are large, oval, and project 

 laterally further than the main lobe. The surface of the test of the glabella 

 is finely but sharply granulated ; that of the border is finely striated. Size 

 about the same as that of PMllipsia Doris.'' 



Geological position and locality.. — Goniatite limestone (Waverly series), 

 Rockford, Indiana. 



PHII.I.IPSIA HOWI, Billings. 



PMllipsia Hold, Billings, 1868, Can. Nat. , Vol. VIII, p. 209, tig. 

 Phillipsia Hoici, Hartt, Acadian Geol. (Dawson), p. 318, fig. 183. 

 PMllipsia Hoici, Herrick, 1887, Bull. Sci. Lab. Denison L^niv., II, p. 68. 

 The pygidium of this species is thus described by Mr. Billings : — 

 • ' Pygidium semi-elliptical, stronglj'^ convex, width at the anterior margin 

 a little less than the length ; 17 or 18 articulations in the axis ; side-lobes 

 with 10 or 12 ribs and a smooth border. The axis is very prominent, about 

 one-third the width, gradually and uniforml}" tapering and terminating ab- 



