209 



Fig. 116. Spirifer sculptilis. 

 (from Hall). 



Brachial and pedicle valves 



with the su ra- 

 ni i t flattened 

 or grooved; 

 small number 

 of sharp and 

 abrupt angular 

 plications, and zigzag laraellose lines of growth. 



Found in the Encrinal limestone, at Section 5, etc. 



Spirifer (Delthyris) consobrints. D'Orbigny. (Fig. 

 117.) (Pal. N. Y., Vol. IV., p. 222, PI. XXXV., S. zig- 

 zag. ) 



Distinguishing Characters.— General appearance like a 

 short- winged, bulging and robust S. mucronatus ; high con- 

 cave cardinal area of pedicle valve; incurved beak; sharply 

 defined sinus, bounded by strong plications; abruptly 



Fig. 117. Spirifer consobrinus. Dorsal, ventral, cardinal, profile, and front views of a 

 large and well-preserved specimen (from Hall). 



elevated mesial fold on the brachial valve, flattened or 

 grooved along the top ; few (sixteen to twenty-four on each 

 valve) strong, elevated, angular plications, which are 

 crossed by concentric zigzag lamellose lines of growth, with 

 finer lines between; radiating striae occasionally observed. 



Found in the lower Moscow shales, two to five feet above 

 the Encrinal limestone, at Sections 4, 5, etc. 



