SOME NEW SPECIES OF DEVONIAN FOSSILS 550 
Hinge line about one-third the width of the shell. Cardinal 
area very narrow and inconspicuous. 
Brachial valve not known: Pedicle valve showing a lightly 
impressed muscle scar and a distinct median septum, which latter 
is traceable about one-half the length of the shell. 
Surface showing distinct growth lines and rather indistinct 
radiating markings. These latter can hardly represent the surface 
spines, but suggest them. 
Horizon and locality.—Amherstburg dolomite, Stony Island Dry 
Cut, Livingston Channel, Detroit River, near Trenton, Michigan. 
Loxanena inculta n.sp. 
PrAre Tl icss 7 AND) S 
Shell tapering gradually to a high spire; apical angle 35°. 
Six or more volutions which are moderately convex or somewhat 
flattened on the outer surface but rather abruptly curving on the 
lower side of the whorl. Aperture subelliptical. Surface marked 
by strong regularly elevated striae, which turn gently backward 
from the suture and then forward, completing the curve before 
the periphery of the whorl is reached and below which they have 
been preserved. 
Horizon and locality.—Amherstburg dolomite, Stony Island Dry 
Cut, Livingston Channel, Detroit River, near Trenton, Michigan. 
Callonema perlata n.sp. 
PrateE III, Fics. 1 AND 2 
Shell depressed turbinate; spire low, consisting of five or more 
volutions which increase in size gradually and are oval in cross- 
section. Apical angle 138°. Umbilicus large and shallow. Suture 
moderately depressed and marking the outer margin of the preced- 
ing whorl. 
Surface marked by medium to coarse striae of growth, which 
pass obliquely outward from the suture, continue over the periphery, 
from which they curve gently backward, and then disappear in 
the umbilicus. The coarseness of the striae increases with distance 
from the apex of the spire. 
