4 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



RELATION OF THE FAUNA TO A NEAR-BY FAUNA 



A collection of fossils obtained along the Tamiami Trail, in Mon- 

 roe County (sec. 13, T. 54 S., K. 32 E), 9 miles west of Pinecrest 

 (Station 1/1179), were referred to the Pliocene.^ 



This locality is about 13 miles west of that where the fossils were 

 obtained for this paper. The white or light-gray limestone in which 

 the fossils at Station 1/1179 were found was thrown out of shallow 

 ditches to form the roadbed of the Tamiami Trail and carries many 

 individuals of Ostrea^ Pecten^ Spondylus^ and casts of other genera — 

 a fauna unlike that found in the sand to the east. It appears quite 

 probable that the bed at Station 1/1179 either is represented by the 

 3-foot bed in the section 42 miles west of Miami or is a little older 

 and that the underlying sand in the section is older than the lime- 

 stone bed at Station 1/1179. 



SUGGESTED AGE OF THE FAUNA 



The fauna is tentatively placed in the upper Miocene, although 

 it may represent a Miocene-Pliocene transition or a Pliocene fauna. 

 The relative stratigraphic position of the sand in which the fossils 

 occur has not been fully determined with respect to distant deposits. 



The species ^at indicate a Miocene age rather than a later are as 

 follows: Gypraea caroUnensis -jioHdana^ new subspecies {G. caro- 

 linensis Conrad appears to be confined to the upper Miocene) ; Turri- 

 tella cookei gladeensis, new subspecies {T. cookei Mansfield and sub- 

 species occur in the upper Miocene of western Florida) ; Area 

 scalaris Conrad var. {A. scalaris Conrad appears to be confined to 

 the upper Miocene); and Spisida incrassata (Conrad), a Miocene 

 species. 



The species that indicate a Pliocene age are: Vermetus varians 

 d'Orbigny; Macrocallista nimhosa (Solander), a species more char- 

 acteristic of the Pliocene but occurring in the upper Miocene 3 

 miles southeast of Lumberton, S. C. ; Phacoides pensylvanicus (Lin- 

 naeus) var. (a lower and thinner shell than typical). P. pensyl- 

 vanicus (typical) appears to begin in the Pliocene. 



DESCRIPTIONS OF NEW SPECIES 



OLIVELLA TAMIAMIENSIS, new species 



Plate 1, Figure 3 



Deseription. — Shell large, solid, acuminate at posterior end, and 

 consists of 7 whorls. Five early whorls, measuring 2.5 mm. in alti- 



' Cooke, C. W., and Mossom, Stuart, Geology of Florida, 20th Ann. Rep. Florida Geol. 

 Surv., p. 166, 1929. 



