110 
AUG. F. FOERSTE 
arkansana, and Cyphaspis spinulocervix. Prof. Van Ingen has 
very kindly loaned the types of these species to the writer for 
description, and in these descriptions the names proposed by 
Prof. Van Ingen have been retained. The collection loaned by 
Prof. Van Ingen includes also several specimens of a new species 
of Proetus, which I take pleasure in naming after him. 
Calymene altirostris Sp. nov. 
Plate XIV, figs. 1 A, B, C 
Two cranidia are at hand which may not belong to the same 
species. The one in which the anterior or rostral border is most 
conspicuously elevated undoubtedly is the specimen which 
suggested the name altirostris, and must serve as the type of the 
species, although it is an inferior specimen otherwise. 
Length of cranidium, including the anterior border and the 
glabella, but lacking the neck-ring, 5.5 mm. Including the neck- 
ring its original length may have been nearly 6.5 mm. The gla- 
bella alone is nearly 4 mm. in length, and its maximum width 
at the base is estimated at 4.2 mm. The anterior margins of 
the lateral lobes are approximately 1.5, 2.5, and 3 mm. from 
the posterior margin of the posterior pair of lobes. The anterior 
pair is but faintly indicated, while the other two pairs of lobes 
and the median part of the glabella are strongly convex. The 
general elevation of the anterior part of the glabella above the 
lateral parts of the cranidium is about 1.4 mm., and the anterior 
or rostral border rises nearly 1 mm. above the general antero- 
posterior curvature of the median part of the glabella. Viewed 
from in front, the doublure of the rostral part has an elevation 
of 1.2 mm., and its face rises at an angle of 95° with the general 
horizontal plane of the cranidium, inclining slightly forward 
from the vertical. The deep groove between the anterior border 
and the glabella is scarcely a third of a millimeter in width. The 
anterior margin of the glabella tends to be squarish. The sur- 
face of the cranidium is covered by minute granules, visible 
onl}’ under a lens. 
