LIST OF ILLUSTRATIONS. 



The Chilean Mummy . . . . 



Clay Bust of Filipino Youth 



Micaceous Gneiss ...... 



QuARTzosE Vein in Micaceous Gneiss 

 Sketch Map of Manhattan Island . 

 The Fully Formed Mollusk Larva, or Veliger 

 The Slipper Limpet or Boat Shell 

 Fig. a. Unfertilized Egg 

 Fertilized Egg 



a. The Individual Egg 



b. The Fertilized Egg 



Fig. B. 

 Model i, 

 Model i, 

 Fig. C. 

 Model 2. 

 Model 3. 

 Model 4. 

 Model 5. 

 Model 6. 

 Model 7. 

 Model 8. 

 Model 9. 

 Model 10. 

 Model ii. 

 Model 12. 

 Model 13. 

 Model 14. 



First Cleavage 

 Completion of First Cleavage 

 Resting Stage After the First Cleavage 

 Beginning of Second Cleavage 

 Second Cleavage 

 Second Cleavage Completed . 

 Third Cleavage 

 Third Cleavage Completed 

 Fourth Cleavage Begun 

 Fourth Cleavage Completed 

 Fifth Cleavage Completed . 

 Sixth Cleavage Completed . 

 Separation from the Left Posterior Large 

 Single Cell .... 

 Model 15. Division of Mesentoblast 



Fig. D. 



Fig. E. 



Model 16. 

 Model 17. 

 Model 18. 

 Model 19. 

 Model 20. 

 Model 21. 

 Model 22. 



Second Division of Mesentoblast 



Spreading of Ectoblasts Over the Surface of Egg 



ECTOBLASTS COMPLETELY ENCLOSING THE EgG 



Larva Beginning to Assume its Definite Form 

 Formation of the Veliger Larva .... 49 



Mollusk Larva, or the Veliger, Completed . . 50 



Section of the Veliger Showing Internal Anatomy . 51 

 The Jesup Loving Cup: 



Anthropology-Forestry Panel ) 



Zoology-Palaeontology Panel >• . . . Opposite p. 55 



Obverse Side ) 



Cell of a 



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