I AMi:i.l.ll.K\N( II! ' 

 * umlu.,, i 



< .11 1 1 met tone, I re U raMon to b> 



> occur* In Miiiinv-.:.i .in. I a will )* w.-ll t<. MM ,|- .li ami 



ml. If t: . ijrfntri <*-<-\i: .f tin- slat.' It will in.i-t|ir.. 



:h. (iulcna. 



MWDESMA CNDOv >/>. 



B \\xvi i lu. a. 



Shell <if the same general form as E. orthonntum M. and \V., sp., being ehm- 

 gatc, with the length a little more than twice ami a li.ilf the hight; dorsal and 

 ventral margins suhparallel; posterior edge almost uniformly rounded; anterior 

 ml -hmt. narrowly con\e\ I leak- depressed, wide, strongly" incurved; umbonal 

 ridge IBOOOCptOOOai; medial depression undefined, wide, ratln-r >hallow. Lunule 

 narrnw Imt shaply defined. Kidge and sulcus rather <li-tin't in the anterior half 

 of the posterior dorsal slope of casts. Surface of casts with numerous strong and 

 xini. >\vhat in-regular <-<>ncentric lines of growth; on the dorsal slope and umhonal 

 ri'lp' a number of large and very irregular undulations or depressions. 



Thi- -pecies is distinguished from K. gesneri Billings, sp,., and E. orthonnhtm M. 

 A \V. -p., by its stronger lines of growth,, the irregular surface undulations, and 

 mure uniformly rounded posterior margin. 



formation and^locaiitt. "Upper Buff Beds" of the Tr>>rii<>M fnrinatlon, <>nc and a half miles west 

 f ll.'li>it, WtaootWteTwbWl It wan collf.-i.-<l liy Mr. Charles Schin-hi-rt. 



Hut. Keg. No. 8344. 



ENDODEHMA COMPRESSUM, n. sp. 



\XXVI. KIGS. nd 17. 



Shell elongate, dorsal and ventral margins subparallel, the length two and one- 

 half times the hight. Anterior margin concave above, most prominent and anban- 

 L'lilarly bent down at the middle, beneath which point the upper part of the 

 gradual curve into the basal line is nearly vertical; ventral outline very broadly 

 -innate; posterior margin oblique, most prominent and strongly rounded in the 

 lower half, above passing rather gradually into the hinge line. Beaks compressed, 

 mesial depression or sulcus illy defined but very wide, causing the sinuosity of 

 the ventral margin to extend farther posteriorly than usual. Umbonal ridge 

 rather sharply defined on the upper side by the d. concave character of 



the dorsal slope. Dorsal edge inflected, the intle< ted part extending rather far 

 inward under the beaks (see fig. -'ill Lunule narrow, deep and well defined. 

 Surface of cast with a few ol^i-nre concentric undulations. 



This species seems to be more nearly related to E. gt*ntf\ Hilling, sp.. than 

 to any of the other-. It i- ho\\e\er readily li-tin^ui-lied by the broader sinuo 



-34 



