New Brachiopoda.— Winchell and Schuchert. 287 
rounded, radiating striz, increasing in number by implantation, 
and from 110 to 120 along the outer margin in adult shells, 
crossed by delicate, crowded, concentric lines and a few coarser 
growth marks. 
Brachial valve not deep, evenly convex or with a fold near the 
anterior margin. Cardinal area very narrow, and slightly re- 
flexed. Crural plates prominent, very oblique, coalescing medi- 
ally; upon this thickening at the base two low ridges originate 
which continue upward and outward into the small low cardinal 
processes, about one half of which is covered by the deltidium. 
Immediately underneath the crural plates are two pairs of small 
adductor muscular scars, separated by a low rounded and short 
septum which bifurcates anteriorly. 
Pedicle valve somewhat deeper than the other, evenly convex 
or with a broad shallow sinus near the anterior margin. Hinge 
teeth prominent and joining with the outer elevated margin of 
the short, sub-oval muscular area. This area is centrally divided 
by a low ridge separating the two pairs of adductor and diductor 
scars. 
This species is of the type of S. sénwata (James) Meek (Pal. 
Ohio, vol. 1, p. 87, pl. v, figs. 5a to 5/f), but can be distin- 
guished readily from that species by the smaller size and greate1 
number of striaz, which is about 60, The profound fold and sinus, 
greater size and less numerous strive of S. su/eata de Verneuil, 
will distinguish it from S. scofield/. 
Plate xxx1, figs. 17-20. 
Formation and locality. Ware near the top of the Trenton shales at 
Minneapolis and St. Paul: common near the base of the Galena in asso- 
ciation with Clitambonites diversa at several localities to the south of 
Cannon Falls. 
Strophomena emaciata. 
Shell small, depressed, biconvex, semi-circular in outline; 
hinge-line somewhat less than the greatest width of the valve. 
Surface marked by numerous angulated radiating striz, increas- 
ing in number by interpolation, from 65 to 75 of the large and small 
ones along the anterior margin. 
Pedicle valve depressed convex, sub-angulated medially, great- 
est point of elevation about mid-length. Cardinal area narrow, 
less than 1 mm. in width, strongly elevated with a very convex, 
