The E'ew Species of Brachiopoda. 339 



Orthis flabellites var. spania. 

 Plate 4, fig. 4. 

 Orthis flabellites var. spania, Hall. Palaeontology of N. Y., vol. VIII, pt. 3^ 

 expl. pi. Ixxxiv, fig. 10. 1894. 



Shell with the general aspect of 0. flabellites^ Hall, but with 

 very coarse plications, scarcely more than one-half the number 

 usual in that species. 



Niagara dolomites. Wear Milwaukee, Wisconsin, 



Orthis ? Holstoni {Safford\ Hall. 

 Plate 4, figs. 19-21. 

 Orthis ? Holstoni, Safford. Palaeontology of N. Y., vol. VIII, pt. 1, p. 340, pL 

 V a, figs. 35-37. 1892. 



Shell transverse ; outline semicircular, flinge-line long and 

 straight. Pedicle-valve with a high, vertical, cardinal area,, 

 transected by a very broad, uncovered delthyrium ; beak not in- 

 curved ; surface sloping evenly toward the margins, slightly 

 rounded in the median line, and faintly depressed toward the 

 cardinal angles. Brachial valve depressed convex, nearly flat^ 

 with a broad and low median sinus. 



Surface of both valves covered with fine, elevated, radiating 

 striae, crossed by faint, concentric, cancellating lines which have 

 a slight retral bend on the striae. 



This shell has very much the aspect of a Clitambonite^, but of 

 the two specimens examined, neither has evidence of a deltidium 

 plate, and a transverse section across the umbo of one, shows 

 that the dental lamellae, though strong and convergent, did not 

 unite to form a spondylium. Received from Professor Safford. 



Trenton horizon (Glade limestone). Near Nashville, Tennessee, 



Orthis (Plaesiomys) loricula. 



Plate 4, figs. 7-9. 



Orthis {Plcesiomys) loricula, Hall. Palaeontology of N. Y., vol. VIII, pt. 1, 

 p. 341, pi. V a, figs. 32-34. 1892. 



Shell strophomenoid in outline ; reversed convex. Hinge-line 

 long and straight, making the greatest diameter of the shell* 

 Cardinal areas narrow, subequal. In the pedicle-valve the del- 

 thyrium is covered by a convex plate extending for one-half its 

 length ; the area is erect, the beak not prominent. The valve is 



