BRACHIOPODA — TELOTREMATA. 



34i 



brachial valve the mesial fold merges into the rest of the surface. 

 Nova Scotia var. contractu in Chester of Illinois, Ohio and 

 Nevada. 



CVI. Syringothyris A. Winchell. 

 Spiriferoid, usually large. Pedicle valve with high, erect, cardinal 

 area ; that of brachial valve low. Dental lamellae strong, surround- 

 ing the broad, muscular impressions. A tube (syrinx), open along 

 its inner margin, extends from the apex of the pedicle valve be- 

 tween the dental lamellae and the deltidium (when present) for 



Fig. 436. Syringothyris texla. (Ind. Geol. Survey. ) 



about half the length of the valve. It is formed by the deposition 

 of accretions to the margins of the delthyrium. Shell punctate. 

 Entire surface marked by minute, elongated pits, giving (under a 

 lens) the appearance of twilled cloth. Mississippic. 



383. S. carteri (Hall). Mississippic. 



Length usually more than half the width or subequal. Cardinal 

 extremities nearly rectangular. Pedicle valve the more convex ; 

 prominent at the umbo. 



Waverly, Burlington and Chouteau of Ohio, Missouri, Iowa, 

 Montana, Nevada. 



