264 DESCRIPTION OF A COLLECTION OF FOSSILS, 



PART I. TERTIARY FOSSILS. 



The Tertiary fossils were described, as before said, in the American Journal of 

 Conchology. Besides the species mentioned in that paper, there were others, too 

 imperfect for positive determination, except the two following:— 



Semele solida, Graj' ; a cast. 



OsTREA IRIDESCENS, Gray; a wide-spread species. 



The following forms are here figured for the first time : — 

 Fusus PAYTENSis, G., PI. 35, fig. 1, la; Jour. Conch, v. 4, p. 25. 

 Tritonium pernodosum, G., pi. 35, f. 2; Jour. Conch., v. 4, p. 26. 

 EuspiRA ORTONi, Gabb, PI. 35, fig. 3. 

 Ampullina Ortoni, G., Jour. Conch., v. 4, p. 27. 

 Cerithium l^viuscultjm, G., pi. 35, f. 4; Jour. Conch., v. 4, p. 27. 

 LiTTORiNA laqueata, G., PI. 35, f. 5; Jour. Conch., v. 4, p. 28. 



VOLTJTODERMA PLICIFERA, Gabb, PI. 35, fig. 6. 



Volutilithes id., Gabb, Jour. Conch., vol. 4, p. 28. 



TuRRiTELLA cocHEEiFORMis, G., PI. 35, f. 7; Jour. Conch. V. 4, p. 29. 



R^TA GiBBOSA, G., PI. 35, fig. 8, 8a; Jour. Conch., v. 4, p. 30. 



Cardium (LiEViCARDiuM) PERTENtE, G., PI. 35, f. 9, 9a; Jour. Conch., v. 4, p. 30. 



Arca (Scapharca) raimondii, G., pi. 35, f. 10, 10a; Jour. Conch., v. 4, p. 31. 



PART II. SECONDARY FOSSILS. 



In consequence of the scanty stratigraphical information accompanying the 

 specimens, it is in some cases impossible to assign the species to their proper geo- 

 logical horizon with any degree of certainty. I have therefore united all of the 

 undoubted secondary forms in a consecutive series, quoting with each species such 

 information as I possess. Dr. Raimondi gives the altitude at which each was 

 found, and I have in most cases added it, although not a matter of very great 

 interest. 



CEPHALOPODA. 



AMMONITES, Brug. 



A. ATTENUATUS, Hyatt, PI. 36, f. 1, la, lb. 



JBuchiceras attenuatum, Hyatt, Proc. Bost. N. H. Soc, v. 17, p. 372. 



Shell flattened on the sides and back ; whorls increasing somewhat rapidly in 



size; nodose and marked by obsolete radiating ribs. In the young shell these ribs 



start on the inner edge of the whorl, in contact with the preceding volution, cross 



