272 



OKGANOGRAPHY. 



Fig. 605. 



Fig. 606. 



Fig. 604. Transverse section of the ovary of the Flax (LinwrrO, showing 

 five complete and true dissepiments, a, and five incomplete spurious 



dissepiments, 6. Fig. 605. Transverse section of the mature ovary of 



Astragalus, showing spurious dissepiment proceeding from the dorsal 

 suture. Fig. 600. Transverse section of the ripe ovary of Pliaca. 



folding inwards of the dorsal suture ; while in Oxytropis and 

 Fhaca {fig. 606), a spurious incomplete dissepiment is produced 

 in the ovary of each by a folding inwards of the ventral suture. 

 Various other examples of tlie formation of spurious dissepi- 

 ments might be quoted, but the above will be sufficient for 

 our purpose. It should be noticed that in our description of 

 spurious dissepiments, we have not confined our attention to 

 those of compound ovaries alone, but have also referred to those 

 of simple ovaries, in which they may equally arise. Thus the 

 spurious dissepiments of Cassia Fistula, Astragalus, and Oxi/- 

 tropis, are examples of such formations in simple ovaries. 



We have now to consider the formation of the compound 

 ovary which presents but one cavity, instead of two or more, 

 as in that just alluded to. Such an ovary is formed either by 

 the union of the contiguous margins of the flattened open ovaries 



Fig. 607. 



Fig. 608. 



Fig. 609. 



plac 



Fig. 607. Transverse section of the unilocularovary ofMignnnetteiRe.teda). 

 c. The lower flattened portion or ovary of one of the three carpels of 



which it is formed, pi. One of the three parietal placentas. Pig. GOS. 



Transverse section of the unilocular ovary of an Orchis, c. Tiie lower 

 portion or ovary of one of the three carpels of which it is formed, 

 slightly infolded, pi. One of the three placentas. Fig. 609. Trans- 

 verse section of the ovary of a species of Poppy. o(;. Ovules, plac, plac. 

 Placentas, which in the young oynry almost meet in the centre, and 

 thus the ovary becomes almost multiloctilar, but as the ovary pro- 

 gresses in development it is seen to be distinctly unilocular. 



