2 Gravkly, A'o/cs 0)1 the Spazvuing of lilcdonc. 



end beint^ drawn out into a stalk whose free end is incor- 

 porated into the central common stem of the bunch ; they 

 are white, and opalescent. The yolk does not extend 

 quite to the pointed extremit}- (^I'igs. 7-8). The eggs are 

 all about 7 mm. long x 25 mm. maximum breadth. The 

 bunches are usually of about the same form and size as 

 the one seen in Fig. 8^-, and are fastened to some 

 hard substance (in this case either the glass or concrete 

 sides of the aquarium) by a disc attached to the main 

 stem. Occasionally, however, this disc was of greater 

 extent and the eggs attached to it singly (^'4''. 8/^). These 

 clusters contain fewer eggs than do those with a central 

 common stem. 



Four of the bunches produced were preserved in 

 formalin ; the rest were removed and placed in one of the 

 hatchery tanks with a good supply of sea-water running 

 through it. After about a month there seemed to be a 

 slight diminution in the amount of yelk present, and some 

 eggs broke off from their stalks ; but they showed no 

 other signs of change. On the only occasion when I was 

 fortunate enough to see the actual commencement of the 

 processes involved in the production of a bunch of eggs, I 

 began to watch the specimen, which was then adhering 

 to the glass front of the tank, about two hours before the 

 eggs a]:)peared. During this time the small suckers near 

 the mouth showed a strong tendency to stretch out and 

 adhere to one another, as though in anticipation of receiving 

 the eggs. After some time — probably about an hour, but 

 the exact period was unfortunately not noted — several 

 violent waves of contraction passed over the body from 

 behind forwards, and the siphon directed a jet of water 

 into the oral funnel. Later on, the two lateral pairs of 

 arms were thrust into the mantle-cavity, and pressed hard 

 against the mantle as they moved about inside, whilst the 



