466 



GEOLOGY OF THE BLACK HILLS. 



JURASSIC— Continued. 



Name. 



Lamellibranchiata — Continued. 



Pseudomonotis (Eumicrotis) curta Hall 



orbiculata, n. sp , 



Avicula (Oxytoma) nmcronata M. & H 



Gervillia recta Meek, in MS 



Grammatodon inornatus M. & H 



Mytilus wkitei,n. sp 



Volsella (Modiola) formosa M. & H 



pertenuis M. & H 



Astarte fragilis M. & H 



Trapezium bellefourckensis, n. sp 



subequalis, n. sp 



Pleuromya newtoni, n. sp 



Tancredia (?) inornata M. & H 



corbuliformis, n. sp 



bulbosa, n. sp 



postica, n. sp 



warrenana M. &H - , 



Dosinia jurassica, n. sp 



Psammobia ? prematura, n. sp 



Tbracia sublevis M. &H 



Netera longirostra, n. sp 



Saxicava jurassica, n. sp 



Locality. 



Two miles south of the Belle Fourche, &c . 



(September 19)* 



Two miles south of the Belle Fourche . . . 



Sun Dance Hills 



Locality label not legible 



Sun Dance Hills 



Big Horn Mountains 



(September 20)* 



Eedwater Valley 



East of the Belle Fourche 



Red Canon Creek 



Two miles south of the Belle Fourche . . . 



East of the Belle Fourche 



do 



do 



do 



Eedwater Valley 



East of the Belle Fourche, &c 



do 



Eedwater Valley 



do 



do 



Page. 



CEPHALOPODA. 



Ammonites cordiformis M. & H 



var. distans 

 Belemnites densus M. &H 



Eedwater Valley 



Two miles south of the Belle Fourche 

 East of the Belle Fourche 



354 

 356 

 357 

 358 

 359 

 360 

 361 

 362 

 363 

 364 

 365 

 367 

 368 

 370 

 370 

 371 

 372 

 373 

 374 

 375 

 37li 

 376 



378 

 380 

 381 



CEETACEOUS. 



Systematic name. 



Division. 



Locality. 



Page. 



LAMELLIBRANCHIATA. 



Cyncyclonema rigida M. & H.. 



No. 

 4 



4 



4 

 4 

 4 



2 and 3 





383 

 384 



385 

 386 



387 

 389 

 390 



Pteria linguiformis E. &S 



Cheyenne Biver, near French Creek, 

 &c. 



(Oxytoma) nebrascana E. & S 



(Pseudopteria) fibrosa M. & H 



Cheyenne Eiver, near Eapid Creek... 







2 and 3 





* Only indication of locality given. 



