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EXPLANATION OF PLATE 20 

 Figure Page 



128. Dentalium laqueatum Verrill 98 



129. Dentalinm texasiaimm Philippi 99 



130. Dentalium pilsbrji Rehder 99 



131. Dentalium disparile d'Orbigny 99 



132. Dentalium eboreum Conrad 100 



Fig. a. Apical tip. Fig. b. Complete specimen. 



