A. Winchell on supposed New Cephaloy 
(Proc. Acad. Nat. Sci. Phil., June, 1861, p. 147; saith this Jour., 
pb xxxii, 174). W. planidorsalis bears an extremely close re- 
onship to NV. digonus, Meek and Worthen, from the Rockford 
x i donitae bed” in Indiana (Proc. Acad. Nat. Sci. Phil., Oct., 
1860, p. 470). It differs, however, by having a very distinct 
longitudinal groove along each lateral boundary of the dorsal 
area, and extending apparently the whole length-of the shell, 
while NV. digonus “is marked by two very obscure lateral depres- 
sions near the aperture. ” —N. digonus also is “ rounded stirs 
mto the umbilicus,” from the angle which bounds the do 
area, while in N. planidorsalis, the “regularly rounded” area is 
parated from the dorsum by a dorso-lateral area which is con- 
Navtitus Coe EeORs n. sp. 
ture of the — jeae not pote me to ascertai n wh ether 
fl the center is marked = a narrow groove. The dorso- 
i The a are rather dee y sinuous—a arene sinus 
broad 
HE 
“ieee 
gl 
cd 
ip 
4 
a 
& 
8 
=] 
q. 
ti 
i 
B 
8 
& 
ee 
depth of dicta sinus "07; of intern sinus 14; interse; 
tance on the dorsum ‘17. 
‘Marsh 
Navritus fifscuicontova) STRIATULUS, 0. Sp. 
Shell small, rapidly enlarging, whorls not impressed, flattened 
on —— eceee fot AA ide of: the peripheral line, and thence 
into the umbilical expanse; aes sec- 
ton somewhat ah ere with the major axis correspondi 
to the 
Septa sli aaoaak one 
rse diameter of the shell. — > gre 
1 shallo tending across the sid 
| the dorsum, ee finely A elegantly fluted longitudinally. 
| The largest fragment of this species is about half a volution, 
