4 Bulletin 3 (86) 



Conclusions drawn from the present paleontological 

 study. 

 The last mentioned part is followed by ( i ) a detail account of 

 all the localities or stations whence the Tertiary fossils were ob- 

 tained, (2) a table showing at a glance the geographical distribu- 

 tion of the Eocene molluscan species in Texas and their geologi- 

 cal range in this State and others farther east, (3) a table showing 

 the bathymetric distribution of the Galveston well fossils, pp.4 10- 

 434, and (4) 36 large octavo plates illustrating the species men- 

 tioned or described in Parts 2 and 3. 



The article published by the Academy contained the description 

 of the new species of Part 2 and the figures belonging thereto ; the 

 majority of that part, and which alone is of present strati graphic 

 value, still remains in manuscript. 



This Bulletin is practically a condensation of Part 3. It seems 

 advisable that this unique material should no longer remain 

 unpublished, for up to this date no other marine Neocene 

 fossils are known from the Gulf slope west of Mississippi. The 

 opinions expressed, regarding the age of the deposits penetrated, 

 in the American Journal of Science, vol. 46, p. 42, and in the 4th 

 Annual Report of the State Survey, 1893, are still maintained ; in 

 brief the section is as follows : — 



. Depth in feet. Geological horizon. 



46 to 458 Pleistocene. 



548 to 1,510 Doubtful. 



1,510 to 2, 158 Upper Tertiary. 



2,158 to 2,920 Miocene (Upper). 



Specific Characteri^jation. 



PBI/KCYPODA. 



PECTEN. 



Peden sp. 



Syn. Pecten, sp., 4th Ann. Rep. Tex. Surv., 1893, P- 121. 



Characterization. - Subcircular in outline ; right valve general- 

 ly inflated about the umbonal region, with 16 or 17 smooth flat 

 ribs equal in width to the interspaces ; interspaces with more or 



