15 



embryo, wliich becomes pink as it develops, the quantity of 

 light green yolk decreases until tlie eggs are of a transparent 

 pink. 



On 3rd November, 1911, twenty-nine berried females were 

 placed in a tank in the Laboratory in order to procure larval 

 stages. Of these, twenty-eight had dark green eggs, and one 

 had a little more than half the yolk replaced by the pink 

 embryo. This latter, the eggs of which would probably have 

 batched out in the spring, died a few days afterwards. Two 

 others died on 8tli November, and the eggs were still dark 

 green. <"n 21st December a number of those still living were 

 examinee,, and all had light green eggs. The eggs were fewer 

 in number, and it is probable that they had been removed by 

 the females. This has been noticed when berried females were 

 kept in small tanks. A further examination was made on 26th 

 April, 1912. Some carried few eggs. In the majority the eggs 

 were well advanced and beginning to turn to a transparent pink, 

 a small quantity of green yolk remaining. In two cases the 

 eggs were of a light green colour, but the embryo had the eyes 

 showing quite distinctly, and the yolk did not occupy more than 

 one-third of the egg. 



Frequency of Breeding. — From the high percentage of non- 

 berried females found during tJie winter months, it is evident 

 that breeding does not take place annually. On 31st August, 

 1911, six non-berried females were placed in a tank in the 

 Laboratory, and no eggs had appeared by the following April. 



In Table VI. will be found particulars relating to the condi- 

 tion of the ovaries of nine non-berried females, eight of which 

 were examined in July. The size of the eggs in the ovaries, 

 which were large in bulk in Nos. 1 and 2, suggests that spawn- 

 ing was approaching, and if the colour and size of the ovarj- 

 be any criterion, this may be the same in Nos. 7 and 8. These 

 latter contained spermatophores in the spermatheca, which is 

 situated between the fourth and fifth pairs of walking legs. In 

 the case of No. 9, which was examined in October, it will be 

 seen that the eggs are very small, and some considerable time 

 must have elapsed before they were ready to be spawned. 

 Although no measurements were made of the eggs in the ovaries 

 of the remaining four, the ovaries were quite small in bulk and 



