SUPPLEMENT 



BRACHIOPODA IN ART I C U LATA. 



DESCRIPTIONS OP 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 narroAV 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 Chilly, 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. 



