WAVEELY GROUP SPECIES. 323 



TRILOBITA. 



Genus PHILLIPSIA, Portlock, 1843. 

 (Report Geol. London, etc., 305.) 



Phillipsia (GrRiFFiTHiDEs?) LoBiENSis, Meek. 



Plate 18, fig. 3. 



Compare Phillipsia insignu, Winchell (1863) ; Proceed. Acad. N. S., Philad., XV., 24. 



Rather small, with an elliptic general outline, the length being some- 

 what less than twice the breadth ; cephalic shield forming rather more 

 than a semicircle, with the posterior lateral angles terminating in acutely 

 pointed spines that extend back to the third thoracic segment ; anterior 

 and lateral margins rounded in outline, and provided with a more or less 

 flattened border, ornamented above with a row of small tubercles,* that 

 extend back a little upon the posterior lateral spines, while it is some- 

 what thickened and finely striated on the under side; glabella small, 

 longitudinally oval, moderately prominent, separated from the cheeks 

 on each side by a well-defined furrow, but without visible lateral furrows 

 of its own (unless there may be a posterior one on each side separating 

 a little tubercle) ; whole surface occupied by about twenty-five distinct 

 tubercles or coarse granules ; eyes small, tuberculiform, rather prominent, 

 and situated near and opposite the posterior third of the glabella, with 

 the visual surface smooth or very minutely reticulated; cheeks occupied 

 by comparatively coarse, prominent tubercles, like those on the glabella; 

 thorax with middle lobe somewhat wider and higher than the lateral, 

 from which it is separated by well-defined furrows ; segments of mesial 

 lobe ornamented with tubercles, arranged so as apparently to form five 

 longitudinal rows ; pleurae each provided with two nodes, arranged so as 

 to form two rows along each lateral lobe, those of the outer row being a 

 little larger than the others, and situated somewhat within the middle 

 of each lateral lobe at the point where the pleurae bend to form the slope 

 to their lateral extremities; pygidium semielliptic, with length and 

 breadth as three to four, very convex ; mesial lobe very prominent and 

 equaling more than one-third the entire breadth at the anterior end, 

 rather rapidly tapering backward to an obtuse, prominent termination 

 before quite reaching the posterior margin, provided with twelve or thir- 



* Not represented in the figure, or clearly seen in the specimen drawn, but observed 

 in others. 



