BRACHIOPODA. 
129 
differs from that of Parazyga hirsuta in having the lateral portions united by a 
central lobe, and the entire process supported by a short, septiform median 
buttress. These differences in the hinge-plate are of inconsiderable import¬ 
ance and the loop is essentially like that of P. hir¬ 
suta ; its posterior geniculation being more nearly 
at the middle of its length, the anterior bend 
shorter, the entire upper portion of the loop above 
the geniculation of the lateral branches being 
expanded laterally and the lamellae much broadened. 
Fig. Hi. Loop of 2‘arazyga Deweyi, ILilI. 
(C.) 
Genus ANOPLOTHECA, Sandberger. 1855. 
PLATE LII. 
1853. Terebratwla, Schnur. Beschr. dei’ Eifel. Brachiopoden, p. 180, pi. xxiv, fig. 3. 
1855. AnoplotJieca, F. Sandberger. Sitzungsber. der k. k. Akad. der Wissensch. math, naturw. Class. 
Jit. xvi, p. 5; pt. xviii, p. 102, pi. i, figs- 1-6. 
1856. Productus, Anoplotheca, The Sandberger.s. Verslein. des rhein. Schicht. syst. Nassau, p. 351, 
pi. xxxiv, fig, 18. 
1856. Anoplotheca, Suess. Classification der Brachiopoden von Th. Davidson, p. 94, pi. iii, fig. 26. 
This name was introduced by Dr. Fridolin Sandberger, who described, first 
in April, 1855, the general external and internal characters of the genus, and 
in November of the same year, gave a partial account of the brachial apparatus. 
The following description is a translation of that given by Suess in his German 
edition of Davidson’s “ Classification of the Brachiopoda,” and is derived from 
the two accounts published by Sandberger. 
“ Shell oval in outline, concavo-convex, without pedicle-opening, cardinal 
area or deltidium. The hinge-line is arched, the inner margins somewhat ele¬ 
vated and radially grooved by the impressions of the cilia of the mantle. The 
convex ventral valve is the larger. On its interior, near the hinge, lie two 
stout teeth ; along the median line from the beak, for one-half the length of the 
valve, extends a narrow ridge, which is divided at its lower extremity; on 
either side of this may be seen the impressions of the cardinal muscle, and at 
its lower end the little ovate scar of the adductor. Near the upper end of the 
cardinal scar originates, on each side, the main trunk of the vascular sinuses, 
which passes rather obliquely toward the margins, but before reaching them 
sends off a trifurcate lateral branch toward the center, and is itself divided. 
