APPENDIX II. A Waverly Trilobite. 
Since the preceding synopsis of Trilobites was put in type, a fine 
specimen of Phillipsia shumardi, (missouriensis, Shumard, ) was found 
in the Waverly, south of Granville, by W. F. Cooper, which makes it 
possible for us to complete the description quoted on page 58, and to 
correct a few minor inaccuracies. This identification, which can 
hardly be open to the slightest question, will throw additional light on 
the position of the Lithographic limestone of Missouri. 
Phillipsia shumardi, Herrick. 
( Plate VII, Fig. 14. ) 
Proetiis missouriensis, Shum., Geol. Surv. Missouri, p. 196. (See 
ante, p. 58.) 
The description following is based upon an entire and nearly per- 
fect specimen from the Waverly freestone at Granville, O.; 
General form elongate, oblong elliptical, axial portions strongly 
elevated ; outline of head somewhat parabolic, nearly twice as broad 
as axial length. Head shield very high axially, the height of the gla- 
bella being considerably more than one-fourth the entire width of the 
head shield ; cheeks produced into spines reaching about to the third 
thoracic segment. The glabella is short and broadly rounded anteri- 
orly, margin in front thickened to form a high mural ridge or lip sepa- 
rated from the prominent frontal portion by a deep sulcus ; axial por- 
tion about one-third as wide as the entire head shield and scarcely ex- 
panded anteriorly, marked by three lateral sulci. The basal (postero- 
lateral) lobes are large and oblique, separated by an interval equalling 
about half the width of glabella. The sulcus anterior to the lobes has 
a slight tendency to bifurcate and the two in front of it are faint and 
less oblique. The palpebral lobes are very large. The cervical 
groove is deep and abrupt and the cervical segment does not rise to 
the level of the median axial portion. The cheeks are extensive and 
decline greatly to a submarginal groove. The spine is of moderate 
