BRACHIOPODA — TELOTREMA TA. 



303 



298. D. bovidens (Morton). (Fig. 377.) Carbonic. 



Elongate, ovate, averaging about | inch in length by \ inch in 



breadth. Pedicle valve strongly arcuate with prominent, incurved 



beak and broad mesial sinus, extending anteriorly from the middle 



of the valve. Brachial valve 

 almost straight along the 

 median line from the ante- 

 rior margin to about the 

 middle where it begins to 

 curve gently to the beak; 

 mesial fold usually entirely 

 lacking. Surface nearly 

 smooth. This is larger than D. romingen and lacks its broader 

 ovate character. It differs from D. turgidum in its larger size, 

 less gibbous form and less emarginate anterior portion. 

 Widely distributed through the central United States. 



Dielasma bovnlens (Ind. Geol. 



Survey). 



XCI. Euxella Hall and Clarke. 



Differs from Dielasma in the absence of the large hinge plate. 

 Devonic. 



299. E. lincklaeni Hall. (Fig. 378.) Devonic. 



Terebratuloid. Pedicle valve at times with a narrow mesial de- 

 pression ; beak more or less abruptly incurved ; umbonal slopes 

 concave toward the cardinal 

 margin. Surface of both valves 

 marked by fine concentric 

 growth lines. Shell structure 

 punctate. 



Marcellus and Hamilton of 

 New York, Michigan, Indiana. 



XCI I. Tekebratula Klein. 



Form terebratuloid, elongate 

 biconvex generally with median 

 flattening or' depression in each 

 valve. Surface not striate ; 

 deltidial plates complete. Loop 

 short, unsupported by a median septum at any stage of growth. 

 (Fig. 380.) Devonic(?)-Recent. 



Fig. 378. Ennella lincklceni. Views 

 of two individuals showing variation (Pal. 

 N.Y., IV.). 



