1901.] Life-hislory of Cclex fatigans. 67 



cap and lie in contact with the sides of it. When the float cap breaks, 

 the cup-shaped cell comes away and becomes flattened out and then looks 

 like a star. Tlie end of the egg shell itself which forms the lid is orna- 

 mented with what appears to be radiating knobs, larger at the centre 

 than at the circumference. The lid of the egg can be well seen in an empty 

 egg-boat. The egg-boat when empty presents a very diSerent appearance 

 from that when it is full. To the naked eye the latter looks compact and 

 neat, whereas the former has an untidy and rough appearance ; it is 

 also lighter in colour than the otlier. Under a magnifying glass the 

 eggs of the empty boat are seen to be opened at the large end which 

 rests on the water, and the lids of the eggs forming the sides and ends 

 of tlie boat can be plainly seen as they lie open at right angles to the 

 length of the egg and the ornamentation of the lid is well shown. If 

 the unhatched egg-boat is taken from the water and left on a slide till 

 it has become dry, and then removed, a pattern is seen on the slide 

 formed by the star-shaped bodies which have become detached from the 

 ends of the eggs and are stuck to the glass. 



