316 
Aug. F. Foerste 
from the Trenton limestone^ at Lowville, New York. I have 
been unable to identify either form, with certainty, with de- 
scribed species from Cincinnatian rocks, and the descriptions 
here given are intended merely to call attention to the chief 
characteristics observed, with the view of further collecting. 
48. Technophorus punctostriatus — quincuncialis, var. nov. 
(Plate II, Figs. 13 A, B) 
The shell or carapace of the minute crustacean here called 
Technophorus quincuncialis so closely resembles that of Techno- 
phorus punctostriatus, Ulrich, that it can be best described by noting 
the differences. If a line be drawn vertically downward from the 
beak toward the basal margin, then the basal margin of Techno- 
phorus quincuncialis, posterior to this line, will be found to be 
more convergent with the dorsal margin, forming an angle of 
about 10 degrees with a horizontal line. Moreover, the two sig- 
hioid ridges crossing the posterior half of the carapace, from the 
beak toward the lower part of the posterior margin, are more 
oblique, the anterior one forming an angle of about 40 to 43 degrees 
with a horizontal line ; the convex part of the curve near the beak 
is relatively much longer, and the concave part, toward the pos- 
tero-ventral angle, is correspondingly shorter. Only one specimen, 
among those at hand, shows the character of the ornamentation 
between the two sigmoid ridges, and in this case it consists of 
striae, about 3.5 in a width of half a millimeter; these striae are 
much wider than the concentric striae on the main body of the 
carapace but occur at about the same intervals as the concentric 
striae where the latter are most distant from each other on the 
anterior part of the body; in direction, they form angles of about 
55 degrees with a horizontal line, or about 15 degrees with the 
general trend of the anterior sigmoid ridge, in this respect resem- 
bling Technophorus divaricatus rather than Technophorus punc- 
tostriatus. The posterior or cardinal wing, behind the second 
signioid ridge, bears no ornamentation of any kind on any of the 
specimens at hand. The interior ridge or so-called clavicle ex- 
tending from the anterior part of the beak toward the basal 
margin is 2 mm. in length. Its position frequently can be detected 
on the exterior of the carapace. Along the upper part of the 
body, between the clavicle and the anterior sigmoid ridge, the 
