149 



APPENDIX. 



r 



Being a notice and description of the Organic Remains embraced 

 in the preceding paper ; by Samuel George Moktox^ M. D. 



\ 



if^ 



Note. — I have had a good deal of hesitation in naming the Spir- 



already described by naturalists, to whose works I could not gain 

 access in time, to avail myself of them ; such names are, therefore, 

 to be considered provisional only. The Uniones and Ammonites, 

 on the other hand, are decidedly neAV. With respect to the veget- 

 able remains, I have compared them with the figures given by Stem- 

 berg, Brongniart, and Lindley, but in many instances without suc- 

 cess. This department will require much more time, and a diligent 

 comparison of specimens. 



PLATE I. 



Unio^ petrosus. (S. G. M.) Fig. 17. Shell subovate, compres- , 

 sed ; disks somewhat flattened, cuneiform inferiorly ; posterior side 

 subcuneate. 



' Unio tumulatus. (S. G. M.) Fig. 18 and 21. Shell subovate, 

 compressed; posterior end cuneiform ; umbonial slope angular; mar- 

 gin swelling anterior to the middle. 



Unio t err enus. (S. G. M.) Fig, 19. Shell elliptical, elongated ; 

 anterior end rather narrower than the posterior; umbonial slope 

 rounded, indistinct. 



Unio saxulum. (S. G. M.) Fig. 20. Shell elliptical, elongated, 

 compressed ; posterior side cuneiform ; extremity acutely angular. 



Anodonta 7 abyssina. (S. G. JM,) Fig. 22. Fig. 23, view of the 

 fcasal margin. Shell elliptical, ventricose; beaks rather prominent, 

 pointed ; umbonial slope not prominent. 



Ammonites Hildrethi. (S. G. M.) Fig. 24. Smooth, ventricose, 

 with two or three volutions: sutures jugiform, crowded: diameter, 

 two inches and a half. 



This fossil is a silicious cast : it is one of the most remarkable spe- 

 cies I have ever seen, and I have much pleasure in giving it the 

 name of the intelligent author of the preceding paper. 



♦ In determining these species of Unio, I Have availed myself gf the superior 

 judgment of Mr. T. A, Conrad. 



