38 R. P. Whaitfield—New Forms of Fossil Crustaceans 
EcHINOCARIS PUSTULOSA, 0. sp 
Carapace ovate, widest anterior to the middle, the greatest 
height equal to three-fourths of the length ; hinge- line straight, 
rather more than half as long as the valve, while nearly one- 
third the length of the valve projects behind its extremity ; 
margin of the valve bordered by a narrow, thickened rim; 
anterior end of the valve slightly excavated below the hinge 
extremity, and the margin broadly rounded in front; posterior 
end more pointed, while the basal line is broadly id evenly 
curved. At the posterior end of the hinge the margin is also 
slightly constricted as in front. Surface of the valve convex 
and marked by the characteristic nodes or ridges. The prin- 
cipal ridge commences in an oval node, which is situated just 
within the anterior third of the length of the valve; is placed 
vertically, just above the middle of the height, and the hori- 
zontal portion, which is sharply elevated and slightly curved, 
is situated almost in the middle of the width, and terminates a 
little less than one-fourth of the length from the posterior 
extremity. The second ridge commences at the hinge-line 
near the middle of its length, and descends with a slightly 
forward direction to within a very short distance of the top of 
the vertical portion of the principal ridge. The anterior ridge, 
corresponding to the anterior node or tubercle of EF. sublevis, is 
arrow and nearly vertical; of a slightly sigmoid form, and 
originates near the anterior extremity of the hinge-line; the 
lower end reaching more than one-third the depth of the valve. 
The surface of the ridges and of the valve in the postero-dorsal 
field, as also of the space below the principal horizontal ridge, 
is marked b correspondingly large and distinct postules. 
Abdomen and telson unknown. 
This species differs from &. sublevis in its slightly Ma 
form, and in the want of the obliquity of the axis of the va 
with the hinge; in the narrower posterior extremity, pisttildae 
surface, and in the form of the surface ridges; most notably in 
the anterior one being ridge-like and vertically sigmoid instead 
of round. The individual used in description is half an inch 
in length and three-eighths of an inch in its greatest height. 
Formation and locality.—In calcareous concretions in the Erie 
shales, at Leroy, Lake County, Ohio. 
EcuINOCARIS MULTINODOSA, ND. Sp. 
Carapace elongate-subovate, about twice as long as high, 
rounded in front and somewhat pointed behind; the basal 
line straightened along the middle portion and parallel to the 
hinge-line; cardinal line straight and nearly half as long as 
the length of the valve, and a little nearer the anterior than 
to the posterior end of the carapace. Margin of the valves 
