EXPLANATION OP THE FIGUBES. 



Fig. I Fig. 



a pedicle ; h, i, separation into > 373 

 segments ; d, a segment become j 

 free; *, form of the adult. 374 

 [Sarsl 



367 Portion of a horny sheathed 



polyp (Campanularia) : a, 375 

 cup, which bears tentacu 

 b, the female cell, containing [ 

 eggs ; c, the cells in which the i 376 

 young are nursed, and from 

 which they issue . Steenstrup 



368 The young of the same, with 



its ciliated margin, magnified. 377 



369 Transformations of the canker 



worm (Geometra vernalis): 378 

 a, the canker worm ; b, its 

 crysalis; c, female moth; 379 

 d, male moth. . Agassiz 380 



370 Metamorphoses of the Duck- 

 barnacle (Anatifa)^ a, eggs 

 magnified ; &, the animal as 



381 



382 

 383 

 384 



it escapes from the egg ; c, 

 the stem and eye appearing, 

 and the shell enclosing them ; 

 d, animal removed from the j 385 

 shell, and further magnified ; 

 e,f, the mature barnacle af-|386 

 fixed by its pedicle . Ibid, i 



371 Metamorphoses of a star-fish 



(Echinaster sanguinolentus), 

 showing the changes of the 

 yolk, e ; the formation of the 

 pedicle, p; and the gradual 

 change into the pentagonal 

 and rayed form . . Ibid. 



372 Comatiila, a West Indian spe- 



cies, ia its early stage attached 

 to a r,e:a . . Agassiz 



387, 



389 



390 



The same, detached and swim- 

 ming free . . . Ibid. 



Longitudinal section of the stur- 

 geon, to show its cartilaginous 

 vertebral column . Ibid. 



Amphioxus, natural size, show- 

 ing its imperfect organiza- 

 tion .... Ibid. 



Section of the earth's crust, 



showing the relative position 



of the rocks composing it. 



[Agassiz 



Fossils of the Palaeozoic age. 

 [Murchison. 



Homalonotus delphinocephalus. 

 [Konig 



Pterichthys { . . Miller 



Coccosteus 6uspidatus . Ibid. 



The Flora of the coal period. 



[Richardson 



Foot-prints of birds . Ibid. 



Plesiosaurus rugosus . Owen 



Pterodactylus crassirostris. 



[Goldfuss 



Jaw of the Thylacotheriwn, 

 magnified. . Richardson 



Fossils, shells, and Hemiciduris 

 from the oolitic rocks. 



[Phillips 



388 Fossil shells from the 

 greensand strata of the Isle of 

 Wight . . . Mantell 



Fossil shells, and Mammalian 

 remains, from the locustrine 

 tertiary strata of the Isle of 

 Wight, to illustrate the fauna 

 of that period . . Ibid. 



The Megatherium. 



[Pander and D'Alton 



