TRILOBITES. 755 
Harpina minnesotensis. | 
Genus HARPES, Goldfuss, 1839. 
Subgenus HARPINA, Novak. 
HARPINA MINNESOTENSIS, ”. Sp. 
The original of this evidently new form is a part. of a cephalon (considerably 
more than one-half), preserving the outline of the frontal and lateral limb and the 
configuration of the surface. The anterior curve is subsemicircular, broadly round- 
ing to the sides where the margin is straight for a considerable distance, thence 
incurving rather abruptly at the angles of the genal expansions. The outline thus 
formed may be termed subquadrate-ungulate, and its peculiar curve is a distinguish- 
ing character of the species. 
Fig. 76.—Cephalon of Harpina minnesotensis. 
General surface of cephalon moderately elevated. Glabella subtrigonal, tapering 
anteriorly to an obtusely rounded extremity. Length about one-half that of the 
cephalon axially; slightly greater than the width across the base. The top of the 
glabella is somewhat abraded but its lobation is quite distinct, showing that the 
frontal lobe is long and conical, extending for about one-third the glabellar length, 
the first pair of lateral lobes faint, the second pair a little longer; the third pair is 
comparatively large, ovoid, attached by a narrow neck to the basal and most elevated 
portion of the glabella. Of the glabellar furrows the third are largest and deepest. 
Occipital furrow broad and shallow; occipital ring narrow in the middle widening to 
the axial furrows. The frontal limb is broad, convex just in front of the glabella 
becoming deeply conéave and elevated at the margin, to the full hight of the glabella. 
This general concavity of the marginal area is continued over the cheek, to the 
extremity of the cheek-spine, becoming, however, less, posteriorly. The outer 
marginal rim is thickened all around; the inner margin elevated but not thickened 
except at the continuation of the occipital ring on the cheeks. Hyes situated in a 
transverse line which crosses the glabella at about one-third its length from the 
anterior extremity, elevated and widely separated from the glabella by the broad 
dorsal furrows. A low ocular ridge extends from them obliquely backward toward 
the posterior extremity of the glabella. 
