the natural Group of Plants called Pomacea. Q\ 



carpia attached to the side of the fleshy calyx. Phot una has a 

 little bilocular capsule inclosed in the fleshy cal\ \. 



The cells of the ovarium in Amelanckitr are completely divided 

 in tw& by a dissepiment, which is quickly obliterated by the 

 growth of the ovula ; so that the ripe fruit does not differ in this 

 respect from the rest of the order. Nor indeed is the ovarium 

 so materially dissimilar as would at first sight appear : since its 

 cells are made bilocular by a spurious dissepiment, having a dif- 

 ferent origin from that of plurilocular fruit iu general, inasmuch 

 as it is opposite to the style and not alternate with it. It is not 

 connected with any corresponding increase in the number of 

 styles, either apparent or hypothetical ; nor can it be considered 

 an extension of the placenta, as are the false septa of many 

 fruits. On the contrary, it originates from the axis of the back 

 of the cell, as is proved by Pyrus arbutifolia and Photinia integri- 

 folia, in which it is rudimentary only. It, therefore, is probably 

 analogous to the partial dissepiment of certain Malvaceee, such 

 as Thespesia populnea. 



The direction of seeds is usually ascending. In Crataegus Oxy- 

 acantha, and those species more immediately connected with it, 

 the seeds are peltate ; and by this character I have formerly 

 proposed to distinguish Cratcegus from Mespilus. But in some 

 other species, such as C. glandulosa and pyrifolia, I have since 

 observed the usual direction of the order to exist. In Chama- 

 rneles, in which the ovarium is simple, the ovula are absolutely 

 erect. 



The number of seeds in the chief part of the order is two, or 

 one by the abortion of the other. In Cydonia and Chcenomeles 

 their number is indefinite. In Osteomeles they are solitary in 

 their youngest state. 



The testa, in all the genera with osseous endocarp, is mem- 

 branaceous ; but in Pyrus it is cartilaginous : and in Raphiolepix 



N 2 coriaceous : 



