PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 23 

 Table II. — Measurements — Continued. 



note: OIV SHEIil^S FRo:n COI^TA RICA KITCmiEIVraiDDEIV, COIi- 



liSCTED BV urs. fliivt anjd braivsfobd. 



By TV. H. DAL.L. 



In their arcliaeological explorations in Costa Rica, while examining 

 the shell-mounds of Culebra near the western coast, a number of shells 

 were obtained from the mounds to exhibit the species of which the 

 shell-heaps were composed. They are, of course, in a semi-fossil condi- 



