NATURAL SCIENCES OF PHILADELPHIA. 421 



51. Helicoceras Mortoni, Hall & Meek, sp. 



Hamites Mortoni, Hall & Meek, 1854, Mem. Am. Acad. Arts and Sci. v. N. S. 



pi. iv. fig. 3. 

 Helicoceras tenuicostatum, M. &. H. March 1858, Pr. Acad. Nat. Sci. Phila. 56. 



52. Helicoceras cochleatum, Meek & Hayden. 



Turrilites {Helicoceras) cochleatus, M. & H. March 1858, Pr. Acad. Nat. Sci. 



Phila. 55. 

 Helicoceras cochleatum. M. & H. May 1860, Pr. Acad. Nat. Sci. Phila. 185. 



53. Helicoceras Nebrascense, Meek & Hayden. 



Ancyloceras ? Nebrascensis, M. & H. March 1856, Pr. Acad. Nat. Sci. Phila. 71 . 

 Turrilites Nebrascensis, M. &H. Nov. 1856, " " 280. 



54. Helicoceras tor turn, M. & H. March 1858, " " 54. 



55. Helicoceras C h eyenn en s e, Meek & Hayden, 



Ancyloceras ? Cheyennense, M. & H. March 1856, Pr. Acad. Nat. Sci. Phila. "71. 

 Turrilites Cheyennensis, M. & H- Nov. 1856, " " 280, 



56. Helicoceras angu latum, M.& H.May 1860, " " 176. 



57. Helicoceras umbilicatum, Meek & Hayden. 



Turrilites? umbilicatus, M. & H. March 1858, Pr. Acad. Nat. Sci. Phila. 56. 

 Helicoceras umbilicatum, M. & H, May 1860. " " 185. 



58. Ptychoceras Mortoni, M,&H. May 1857, " " 134. 



59. Baculites o vat us, Say, Jour. Acad. Nat. Sci. Phila. vi. pi. v. fig. 5, 6. 



60. Baculites grandis, Hall & Meek, 1854, Mem. Am. Acad. Arts and Sci. 



Boston, v. N. S. 402. 



61. Baculites asperoides, Meek & Hayden (MSS.) 



62. Baculites compressus, Say, Am. Jour. Sci. ii. 41. 



63. Aptychus Cheyennensis, Meek & Hayden (MSS.) 



64. Aptychus fragilis, Meek & Hayden (MSS.) 



GASTEROPODA. 



MURICID^E. 



65. Fusus (Neptunea) D a k o t e n s i s, M. & H. March 1856, Pr. Acad. Nat. Sci. 



Phila. 65. 



66. Fusus (Pyrifusus?) Newberry i, M. & H.March 1857, Pr. Acad. Nat. Sci. 



Phila. 66. 



67. Fusus sub turrit us, M. & H. May 1857, Pr. Acad. Nat. Sci. Phila. 139. 



68. Fusus intertextus, M. & H. " " " 139- 



69. Fusus? flexicostatus, M. &H. March 1856, " " 66- 



70. Fusus Vaugh an i, M. & H. May 1857, " " 139. 



71. *Fusus vinculum, Hall & Meek sp. 



Buccinum? vinculum, H. & M. Mem. Acad. Sci. and Arts, Bos.v.N.S. pi. 3, fig. 5. 

 Fusus vinculum, M. & H. May 1860, Pr. Acad. Nat. Sci. Phila. 183. 



72. Fusus Scarborough i, M.&. H.May 1857, " " 139. 



*It is not improbable that this species may be found to possess affinities to some section 

 of the genus Tritonium Link. It is certainly not a true Buccinum. 



1860.J 



