209 



Fig. llfi. Spirifer tivulptilis. 

 (from Hall). 



Brachial and pedicle valves 



with the suiii- 

 m i t liattened 

 or grooved; 

 small mimber 

 of sharp a n d 

 abrupt angular 

 plications, and zigzag laniellose lines of growth. 



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



Spirip^er (Delthyris) co.vsobrints. D'Orbigny. (Fig- 

 117.) (Pal. N. Y.. Vol. lY., p. 222, PI. XXXY^ S. zig- 

 zag.) 



Distingiiisbing Charncters. — General appearance like a 

 short-winged, bulging and i-obust *S'. mucronatus ; high con- 

 cave cardinal area of pedicle valve; incurved beak; sharply 

 defined sinus, bounded bv strong plications: abruptly 



-. 1" 



^: 



.^ 



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

 large and well-preserved specimen (frona Hall). 



elevated mesial fold on the brachial valve, fiattened or 

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

 valve) strong, elevated, angular plications, which are 

 crossed by concentric zigzag lamellose lines of growth, with 

 finer lines between ; radiating stritie occasionally observed. 



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

 the Encrinal limestone, at Sections 4, .1. etc. 



