8G North American 



})ygi(]ium is well marked by a broad limb, which widens out 

 ])osterioi'ly as the ribs become shorter ; the axis is strongly 

 arched, and marked by abont 21 lings, the first five are indis- 

 tinctly outlined, the others aie distinctly indicated. The dorsal 

 furrows are broad and deep, the sides are marked wnth 12 ribs, 

 separated from each other by deep furrows. 

 Length, 24 mm. ; breadth, 2e5 mm. 



PHILLIPSIA MISSOURIKNSIS, Shumarcl. 



Plate 8, Fio-s. 1-2. 



Phillipsia Missouriensu, Shumard, 1858, Trans. Acad. 8ci. St. Louis, Vol. 



I, p. 225. 

 Phillipsia Missouriensis, Herrick, 1887, Bull. Sci. Lab. Denison Univ., 



Vol. II, p. 59. 



We subjoin the original description : 



" Pygidium semi-elliptical, elevated, width greater than length; surface 

 very finely punctate, punctae rather distant and arranged somewhat in quin- 

 cunx ; margin rather broad and smooth ; axial lobe strongly arched trans- 

 versely, gradually tapering, forming not quite four-fifths the total length ; 

 its width equal to about three-fourths the width of one lateral lobe ; rings 

 about 18, rounded on the dorsum and flattened at the extremities, transverse 

 furrow^s narrow, distinctly impressed on the dorsum, becoming nearly obso- 

 lete before reaching the longitudinal furrows ; lateral lobes rather strongly 

 arched transversely, anterior margin angulated. apex of the angle elevated 

 and situated nearest the axial lobe ; segments 11, rounded, curving slightly 

 downwards, not furrowed ; furrows between the segments rather deeply 

 impressed, except the two posterior ones, which are quite shallow. 



Dimensions. — Length of pygidium, .68 inch ; greatest width, .76 ; length 

 of axial lobe. .56 ; greatest width of same, .23." 



Geological position and locality. — Middle Coal Measures, at Lexington, 

 Missouri. 



PHILI.IPSIA MEKAMECENSIS. Shumard. 



Plate 3, Fig. 15. 



Phillipsia Meramecensis, Shumard, 1855, Geol. Missouri, p. 199, pi. B, 



fig. 9. 

 T^hillipsia Meramecensis, Herrick, 1887, Bull. Sci. Lab. Denison Univ., 



Vol. II, p. 59. 

 Phillipsia Rowi, Billings, 1863 ; Can. Nat., Vol. VIII, p. 209, fig. 

 Phillipsia, Vindobonensis, Hartt, 1868 ; Dawson's Acad. Geol., p. 213. 



