OF THE SPONGIAD.E. 281 



FIG. 



32G. A small portion of the surface of a fully-developed 

 ovarium of Geodia McAndrewii in its natural 

 state, showing the distal ends of the spicula flat 

 and angular, and firmly cemented together. 

 X 308 linear. Page 142. 



327. Two ovaria of Geodia McAndrewii, (a) containing 



about the maximum of ova, (b] after a great part 

 of the ova have been discharged. X 108 linear. 

 Pasre 141. 



O 



328. A portion of a section through nearly the centre of a 



mature ovarium of Geodia McAndrewii, showing 

 the radiation of its spicula from near the centre to 

 its circumference. X 308 linear. Page 142. 



329. A portion of a young ovarium of Geodia McAndrewii, 



with the distal ends of its spicula acutely termi- 

 nated, and unconnected. X 308 linear. Page 

 142. 



330. A mature ovarium of Pacliymatisma Jolmstonia, 



Bowerbank, exhibiting the cuneiform spicula of the 

 foramen. X 308 linear. Page 143. 



331. A young ovarium of Pacliymatisma Jolmstonia in 



course of development. X 308 linear. Page 

 143. 



332. A young ovarium of Pacliymatisma Jolmstonia in a 



very early stage of development. X 308 linear. 

 Page 143. 



333. An ovarium from a sponge from Madeira closely 



allied to Pacltymatisma, exceedingly depressed and 

 much elongated. X 308 linear. Page 143. 



334. A fragment of a similar ovarium to that represented 



by Fig. 333, the fracture showing its extremely 

 thin condition. X 308 linear. Page 143. 



335. A young ovarium of the same species as that repre- 



sented by Fig. 333, in an early stage of develop- 

 ment. X 308 linear. Page 143. 



