400 



GEOLOGY OF THE BLACK HILLS. 



J URASSIC— Continued. 



Name. 



Lamellibranchiata — Continued. 



Psoudomonotis (Eumicrotis) curta Hall 



orbiculata.u.sp . 



Avicula (Oxytoma) iiuicrouata M. & H 



Gervillia recta Mock, in MS 



Gramniatodon iiioruatus M. & H 



Mytilus whitci.n.Hp 



Volsclla (Modiola) formosa M. «fc H 



pertenuis M. & H 



Astarte fragilis M. & H 



Trapezium bellefourcliensis, n. sp 



aubequalis, n. sp 



Pleuromya newtoni, n. sp 



Tancredia (!) inornata M. «fc H 



corbuliforniis, n. sp 



bulbosa, n. sp , 



postica, n. sp 



warrenana M. & H 



Dosinia jurassica, n. sp 



Psammobia ? prematura, n. sp 



Thracia sublevis M. & H 



Neasra longirostra, u. sp 



Saxicava jurassica, n. sp 



CEPHALOPODA. 



Ammonites cordiformis M. & H 



var. distans 

 Bclcmnites densus M. & H 



Locality. 



Two miles south of tlio 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)' 



Redwater Valley 



East of the Belle Fourche 



Red Canon Creek 



Two miles south of the-Bellc Fourche . . . 



East of the Belle Fourche 



do 



do 



do 



Redwater Valley 



East of the Belle Fourche, &c 



do 



Redwater Valley 



do 



do 



Page. 



354 



356 

 357 

 358 

 359 

 360 

 361 

 362 

 363 

 364 

 365 

 367 

 368 

 370 

 370 

 371 

 372 

 373 

 374 

 375 

 376 

 376 



Redwater Valley 378 



Two miles south of the Belle Fourche 



I 



380 



East of the Belle Fourche i 381 



CRETACEOUS. 



Systematic name. 



Division. 



Locality. 



Page. 



LAMELLIBRANCHIATA. 



Cyncvclonema ri'^ida M. & H ... 



Ko. 

 4 



4 



4 

 4 

 4 

 2 and 3 



Forks of the Cheyenne River 



383 

 384 



385 

 386 

 387 

 389 

 390 ! 



Pteria liuguiformis E. «fcS 



Cheyenne River, near French Creek, 



(Oxytom.n) uebrascana E. «fc S 



(I'seudopteria) librosa M. »fc H 



sublevis, u. sp 



Cheyenne River, near Rapid Creek... 



Old Woman Fork 



East fork of Beaver Creek 



fragilis H&M 



2 and 3 



Beaver Creek 



• Only indication of locality given. 



