EXPLANATION OF PLATE XXII. 
PAGE 
Hig. 1. Rubbing=stonen—— (2\s, (Cats Now 5-32) eee ser ces erste le einen ieee eee eee 48 
Hie: 2.. Rubbing-stone, ——-()) a (NataMius. of (Costa ities ase een eer ees 48 
Ei¢.73. Rubbing-stone,——(@)s9, (Nat. Muss of Costa Rica) 45. eee 48 
Fig. 4. Rubbing-stone. —(4). (Nat. Mus. of: Costa Riea),.......................5... 48 
Fic: 5. Rubbing=stone,;=—(@): (Cat. No, 2335). on see oe oni BES Sih rake 49 
Fig. 6. Rubbing-stone,—= (2): 7 (GatNor 2538) ae eee opto a ers ane eee 48 
138 
