SUPPLEMENT 
BRACHIOPODA INARTICULATA. 
DESCRIPTIONS OF NEW SPECIES 
REFERRED TO IN THE PRECEDING PAGES OR ON THE ACCOMPANYING PLATES. 
Lingula compta, sp. nov. 
PLATE I, FIG. 16. 
Shell very narrow, with lateral margins nearly parallel for most of their length; 
the anterior margin transverse and the posterior less abruptly rounded. 
Shell-substance thin. Surface marked by fine concentric striae. 
The interior of the brachial (?) valve bears two strong lateral muscular 
ridges which meet in the median line at about one-third the length of the 
shell from the anterior margin. A narrow median furrow extends from just 
behind the center of the valve nearly to the anterior margin. Length of this 
valve, 9 mm., greatest width, 4.5 mm. 
This species is allied to L. densa, Hall, but differs in its narrower form and 
thinner shell. 
Hamilton group. Tichenor's Gully, Canandaigua Lake , N. Y. 
Lingula scutella, sp. nov. 
PLATE I, FIG. 30. 
Shell broad, subquadrate; lateral margins parallel for a short distance, but soon 
rounding to the extremities, which have about equal curvature. Length to 
width as 2 to 3. Surface covered with more or less distinct concentric lines 
and wrinkles. The interior of the original valve, a cast of the interior, 
