LIST OF PLATES XV 



To face 

 page 



Plate 23. On the Development of the Teeth, and on the 

 Nature and Import of Nasmyth's " Persistent Capsule." 

 Figs. 1-12 . . , 240. 



Plate 24. On the Structure and Relation of the Corpuscula 

 Tactus (Tactile Copuscles or Axile Corpuscles), and the 

 Pacinian Bodies. 

 Figs. I -10, a-f ... .■ . 290 



Plate 25. On the Ultimate Structure and Relations of the 

 Malpighian Bodies of the Spleen and of the Tonsillar 

 Follicles. 

 Figs, i-io . 299- 



Plate 26. On a Hermaphrodite and Fissiparous Species of 

 Tubicolar, Annelid. 



Figs, i-ii — Protula dysteri . 350 



Plate 27. On the Structure of Noctiluca Miliaris. 



Figs. 1-6 — Noctiluca miliaris . . . . 356 



Plate 28. Further Observations on the Structure of Appen- 

 dicularia Flabellum ("Chamisso). 



Figs. 1-4 — Appe7idicularia flagelhim . 460 



Plate 29. Description of a New Crustacean (Pygocephalus 

 Cooperi, Huxley) from the Coal-Measures. 



Figs. 1-6 — Pygocephalus Cooperi . . 470 



Plate 30. On Dysteria ; a New Genus of Infusoria. 



Figs. 13-15 — Dysteria armata . 475 



Plate 31. On Cephalaspis and Pteraspis. 



Figs. 1-5 — Cephalaspis . . 518 



Plate 32. On Cephalaspis and Pteraspis. 



Figs. 1-4 — Pteraspis ... . . . 518- 



