xviii FOOT-NOTES TO EVOLUTION. 



FIG. PAG8 



24. Section of mature Sacculina (after Lang) . . . , 281 



25. Sacculina attached (after Lang) ..... 282 



26. Sacculina with limbs absorbed (after Lang) . . . 282 



27. Cretin of Aosta (after a photograph by Dr. J. W. Jenks) 2S5 



28. Cretin of Aosta (after Edward Whymper) . . . 286 



FULL-PAGE PLATES. facing 



PLATB rAGE 



Some chipmunks of California, showing distinct spe- 

 cies produced through isolation (after nature, by 

 William Sacketon Atkinson) . . Frontispiece 

 \. — Cephalopoda ; development of Glyphioceras (after na- 

 ture, by Mrs. Frances Rand Smith). . . . 240 



n. — Development of Glyphioceras (after nature, by Frances 



Rand Smith) ........ 242 



IIL — Development of Schloenbachia (after nature, by Fran- 

 ces Rand Smith) ....... 246 



IV. — Development of septa in Ammonites (after nature, by 



Frances Rand Smith) ...... 248 



V. — Forms of Ammonites (after nature, by Frances Rand 



Smith) 252 



