DEVELOPMENT OF PARAVORTEX GEMELLIPARA 481 



cells contain flakes and globules of a substance which, by the 

 haeniatoxyUn-eosin method, are stained an orange brown, and 

 are in size and density much more conspicuous than the parti- 

 cles suspended in the cytoplasm of the oocyte. 



During the growth of the latter the mitochondrial mass has 

 assmned conspicuous proportions. This relative increase in 

 bulk is well illustrated in figure 6, which indicates as well that 

 the substance may be accumulated in a single mass, or irregularlj' 

 distributed throughout the cytoplasm. One might easily imag- 

 ine, on account of the uneven edges of the masses from which 

 lines of granules are often seen extending out into the cytoplasm, 

 that the mitochondria are being directly transformed into the 

 deutoplasm particles. Van Bamkebe ('98) points out that it 

 is well to guard against such a conclusion, since he finds in the 

 oocytes of Pholcus that the 'yolk-nucleus' granules first become 

 transformed to fatty drops which are reabsorbed by the proto- 

 plasm, and suggests that possibly the latter then manufactures 

 from this nutritive material the true deutoplasm globules. 

 For the present, judgment in this matter of the function of the 

 mitochondrial mass is suspended. It is to be noted that the 

 body increases consistently in bulk while the cell is still in the 

 ovary. 



At the time of encapsulation the oocyte has attained a size 

 about four times that which characterized its earliest appear- 

 ance. The average measurements are approximately 0.112 

 mm. in width and 0.023 mm. in length, the cells being strongly 

 flattened perpendicularly to the long axis of the ovary. 



2. Formation of the capsule and origin of the twins 



As to the manner in which the older eggs are nourished, Pat- 

 terson asserts, ''that the ova are at their upper margins absorb- 

 ing yolk from the glands" (the vitellaria). This altogether 

 erroneous interpretation will be considered below with another 

 concerning the origin of the twins. Again Patterson states that. 



In consequence of this rapid growth certain retrogressive changes 

 involving the cell membranes separating contiguous ova frequently 



