I9I3.] REGION ABOUT NATAL, BRAZIL. 457 



The carnahiiba palm is a typical plant of the alluvial deposit. It 

 does not grow in the sandstone series. 



This alluvial deposit in the valley occurs farther back into the 

 interior than Macahyba. It could be seen as a wide flat depression 

 many kilometers beyond this point, but its limit was not exactly 

 determined. 



List of Quaternary Shells from an Excavation in the Bed of Rio Ceara- 

 MiRiM, Ten Kilometers Northwest of Extremoz, Rio Grande do Norte. 



Pelecypoda. 



fi. Anaiiialocardia braziliana Gmelin. 



*2. Area (Scapharca) braziliana Lamarck. 



*3. Area (Cunearea) deshayesii Hanley. 



$4. Area {Scapharaea) pexata Say var. holmesii. 



*5. Cardium muricatum L. 



$6. Chione pectorina Lamarck 



$7. Corbula swiftiana C. B. Adams. 



*8. Divaricella quadrisulcata d'Orbigny. 



Xg. Phacoides antillaruin Reeve, 



fio. Phaeoides pectinatus Gmelin. 



$11. Laevicardium serratum L. 



$12. Maeonia eonstrieta Bruguiere. 



*I3. Ostrea equestris Say. 



J14. Peeten (near antillensis) . 



*!$. Tellma lineata Turton. 



Gastropoda. 



*i6. Anaehis lyrata Sowerby. 



*!•/. Bulla striata Bruguiere. 



*i8. Cerithiuin algicola C. B. Adams. 



*I9. Cerithkini ihomasiae Sowerby. 



*20. Hemifiisiis mono Lamarck. 



t2i. Nassa vihex Say. 



*22. Neritina virginea Lamarck. 



Explanation. 



* Shells compared with those collected on the Branner-Agassiz expedi- 

 tion to Brazil and identified by Dr. Dall.s 



5 W. H. Dall, " Molluska from the Vicinity of Pernambuco," Proeeedings 

 of the Wash. Acad. Sci., Vol. VIII., pp. 139-147. April 15, 1901. 



t Shells compared with those from collections from Florida. These are 

 also listed in this same paper of Dr. Dall's. 



t Shells identified by Dr. Dall, November 21, 1912, who says: 



"These shells are (except Peeten) identical with West Indian forms 



