New Brachiopoda.— Winchell and Schuchert. 293 
of growth observable. Shell structure fibrous and apparently im- 
punctate. 
Plate xxxIv, figs. 55-58. 
Formation and loculity. Common in the “Glade” limestone at Lebanon, 
Tenn.; also near the top of the Birdseye limestone at High Bridge, Ky. 
Hallina nicolleti. 
Shell small, rostrate, biconvex, oval or sub-cireular in outline. 
Pedicle (ventral) valve convex; point of greatest elevation about 
mid-length, with a shallow, very narrow sulcus down the centre, 
bordered on each side with a low rounded ridge, which towards 
the anterior margin becomes more prominent. ©The antero-lateral 
limits of the shell may be smooth, or with as many as five low 
rounded plications or marginal undulations. Beak strongly in- 
curved, and with a small, oval pedicle opening, bordered by rudi- 
mentary deltidial plates on each side. 
Brachial (dorsal) valve evenly conyex, and trilobed toward the 
anterior Margin; in some specimens the lateral lobes may have 
as Many as six low rounded plications along the front margin. 
Calcified brachial supports much as in LHallina saffordi, except 
that the outer bands are curved laterally, while the anterior, 
recurved portion is shorter. Articulating processes and muscular 
sears unknown. 
Halling nicolleti is an easily recognized species, in its small 
size and camarelloid exterior. It differs from /allinu saffordi 
in the fold and sinus, and the usually obsolete marginal plica- 
tions. Its associated species are the same. 
Plate xxx1v, figs. 59-62. 
Formation and locality. Abundant in the upper third of the Trenton 
limestone at Minneapolis, Mantorville, St. Charles, Rochester and Foun- 
tain. Also at Decorah, in Towa, and Beloit, Wis. 
Rhynchotrema inequivalvis var. laticostata. 
In the shales of the lower portion of the Galena south of Can- 
non Falls R. tnaquivaleis (= R. inerebescens) often attains a far 
greater width than is usual for the species. The four plications of 
the fold are closely arranged, while the five or six on each side of 
it are spread out, and are therefore larger than in that species. 
The junction of the two valves along the anterior margin is also 
more largely flattened. These specimens if found alone would be 
