260 
Aug. F. Foerste 
from the beak. Cardinal area fully 2.5 mm. in height in the larger 
valves. Muscular area not obcordate, but narrowed anteriorly 
so as to give the deepest part of the area a rounded rhomboidal 
form with the greater axis extending parallel to the length of the 
shell. Adductor impressions occupying almost one-third of the 
width of the area, distinctly limited as far as the beak. Anterior 
to the middle of the adductor impression, there is a narrow thick- 
ening of the shell along the middle line, but this can be traced only 
a short distance. Laterally and antero-laterally from the muscu- 
lar area there are long and rather distant radiating striae, usually 
called ovarian markings, but these rarely are preserved. 
Brachial valve moderately and rather evenly convex. Cardinal 
process long, narrow, and thin. Crural plates strongly defined 
and terminating in sharp points. Anterior to the cardinal proc- 
ess the shell is thickened so as to produce a low broad elevation 
extending slightly farther than the anterior edge of the posterior 
adductor impressions. The posterior adductor impressions are 
only faintly delimited, and the anterior ones not at all, in the 
specimens seen so far. 
Surface marked by rather angular plications, increasing by inter- 
calation, about 5 or 6 in a width of 5 mm. along the anterior 
margin of the shell. Concentric striae lamellose, varying from 8 
in a length of 4 mm. near the middle of the shell, occasionally 
to 12 in the same length near the anterior margin. 
6. Dalmanella centrilineata, Hall 
The types of this species were found, associated with Trinucleus 
and Dalmanella, at Lorraine. If our interpretation of this shell 
is correct, it is nothing but a small form of the ordinary Dalmanella 
so common at Lorraine, Pulaski, and elsewhere in the New York 
Lorraine. It is not mentioned by Hall and Clarke in their mono- 
graph on Palaeozoic Brachiopoda, in vol. viii of the Paleontology 
of New York. 
7. Strophomena planumbona, variety 
{Plate II, Figs. 4 A, B) 
A species of Strophomena, (plate II, Fig. 4 A) belonging to the 
planumbona group, but sub triangular in outline, is labelled as 
