58 Cretaceous. 



his convolutus; from the Yellow Stone, 31-elania anthonyi, now Hydro' 

 hia anthonyi; and from near the head waters of the Little Missouri, 

 Cerithium nebrascense, now Cerithidea nehrascensis. 



From (the Fort Pierre Group)* No. 4, of the Cretaceous in Nebraska, 

 Actoion suhellijiticus, Turbo nebrascensis, now Margarita nebrascensis, 

 Bostellaria biangulata, now Aporrhais biangulata, Helcion sexsulca- 

 tus, now Anisomyon sexsulcatum. H. patelUformis, now A. patelli- 

 ^orme, H. alveolus, now A. alveolus, II. snbovatus, now A. siibovatum., 

 Sulla occidentalis, now Haminea occidentalism Turritella convexa, 

 Ammonites halli, now Phylloceras halli, Ancyloceras nebrascense, now 

 Heteroceras nebrascense, A. cheyenense, now II. cheyenense, Avicula 

 fibrosa, rxovf Pseudojitera fibrosa; fv'om \i.Qa.Y th.Q month, of Milk river, 

 Bulla subcylindrica^ now Haminea suhcylindrica, Venus circularis, 

 now Thetis circularis, Cytherea pellucida, now Callista pellucida; 

 Cuculloia exigica, now Trigonarca exigua, Gervillia subtortuosa, Ino- 

 ceramus incurvus, and Ostrea patina; from the Great Bend of the Mis- 

 souri, ITucula obsoletastriata. 



From (the Fox Hills Group)f No. 5, of the Cretaceous in Nebraska, 

 Scalaria cerithiformis, now Cheranitzia cerithiformis, JVatica am- 

 bigua, now Vanikoro amhigua, Natica occidentalis, now Lunatia occi- 

 dentalis, Turbo tenuilineatus, now Spironema tenuilineatum, Fusus 

 dakote7isis, F. galpinanus, now Fasciolaria galpinana^ F. contortus, 

 F. flexuocostatus, now Fasciolaria fiexiiocostata, F. newberryi, now 

 Pyrifusus newberryi, F. culhertsoni, now Fasciolaria culbertsoni, Py- 

 rula bairdi, now Pyrop)sis bairdi, Fasciolaria cretacea, F. buccinoides, 

 Buccinum nebrascensis, now Pseudo-buccinum nebrascense, Bulla vol- 

 varia, now Cylichna volvaria, B. minor, now Haminea minor, Turri- 

 tella moreaucnsis, now Cerithiopsis moreauensis, Belemnitella bulbosa. 



From the mouth of Judith river, on Cherry creek, and on Moreau 

 river, Pholadomyaundata, now Cymella undata, Goniomya americana, 

 Solen subplicatus.^ now Solenoniya suhplicata, Tellina gracilis, now 

 Thracia gracilis, Tellina Cheyennensis, T. scitula, T. subelliptica,r\ovf 

 Corbicula subelliptica, T. prouti, now Thracia prouti, Cytherea de- 

 weyi.^ now Callista deweyi, Cytherea nebrascensis, now Callista nebras- 

 censis, Corbula moreauensis^ now Neaera moreauensis, C. ventricosa, 

 now -Z\r. ventricosa, C. gregaria, now Corbulamella gregaria, Astarte 

 gregaria, now Eryphyla gregaria, Nucula scitula, now Yoldia scitula, 

 IT. evansi, now Y. evansi, If. mquilateralis, now Ifuculana oiquilater- 



* Proc. Acad. Nat. Sci., vol. 8. 

 t Proc. Acad. Nat. Sci., vol. 8. 



