BRACBIOPODA. 801 
faces are vertical and their upper surfaces small and subtriangular. 
They do not unite with each other at any point, but each is 
curved slightly back of the cardinal line, and 
on its ante-lateral angle supports a crus. The 
jugum is situated at about the center of the 
primary lamelle, bends backward for a short 
distance, and then forward at an abrupt angle. 
Beyond this angulation its length is about 5, 974. agit oe Bara: 
twice that before it. It terminates as in zygahirsuta, Hall. 
TremarosPira, in a short, sharp and simple horizontal process 
directed posteriorly. 
Type, Parazyga hirsuta, Hall. Hamilton group. 
Distribution. Devonian. 
Anoplotheca, Sandberger. 1855. 
(Plate 39, figs. 1-8.) 
Synonym; £zjida, Davidson, 1882. 
Shells small, oval, concayo-convex; surface with a few sparse, 
coarse plications, crossed by fine, often imbricating, concentric 
lines. Pedicle-valve with a conspicuously arched dorsum ; 
brachial valve with a distinct median depression. On the 
interior of the pedicle-valve the teeth are large and stout, artic- 
Fig. 372, Fig. 373, 
The brachidium of Anoplotheca lepida, Goldfuss (sp.). 
Fig. 372,—A lateral view, showing the relations of the jugum to the median septum and ridge. 
Fia. 373. A posterior view. 
ulating in deep socketson either side of a broad, thickened, 
slightly elevated hinge-plate. The volutions of the spirals are 
few and the cones are directed toward the lateral slopes of the 
pedicle-valve. The jugum arises at about the halflength of the 
primary lamellz, the lateral branches uniting near the center of 
the internal cavity and forming a simple upright stem whose 
extremity is fitted into a longitudinally grooved callous in the 
pedicle-valve. In the brachial valve is a strong median septum 
; 101 53 
