U. S. NATIONAL MUSEUM 



~* - - -,- 



BULLETIN 93 PL. 60 



3a 



1-1D, TETRACLITA SQUAMOSA MILLEPOROSA; 2, T. SQUAMOSA FORM CONFINIS; 



3-3B, T. S. PANAMENSIS. 

 FOR EXPLANATION OF FIGURES SEE PAGE 354. 



