106 Scientific Proceedings, Royal Dublin Society. 



when in this state, was suddenly drawn up into the scapus, the 

 particles of sand formed a ring round the posterior portion of the 

 investment. When alarmed, it withdraws its disk and tentacles 

 into the capitulum, and the capitulum itself into the investment, 

 by a process of invagination. During the earlier stages of this 

 process the white markings on the disk and on the capitulum may 

 be detected through the body- wall, their position being inverted 

 by the invagination. 



NOTES ADDED IN PRESS. 



Since the aboye Paper was written I have obtained six more specimens 

 of E. timida at the same locality. In colour the new specimens differ 

 considerably from each other, and from those already described. I have 

 set out the points of difference of all the individuals I have seen in the 

 accompanying Table. 



The constant characteristics of the species seem to be — 



1. The ratio of the length to the diameter, 1 to 18. 



2. The pellncid pink colonr of the capitulum, disk, and tentacles, varied 



with opaque white marks. 



3. The absence of tubercles and longitudinal ridges. 



EXPLANATION OF PLATE VI. 



Edwardsia timida (Quatreffages). 



Pig. 1 . Side view of animal, natural size. 



,, 2. Side view x 4 diam. 



,, 3. Diagrammatic sketch of the disk of a x 8 diam. 



., 4. Disk of (3 x 8 diam. 



,, 5. Capitulum closed x 6. 



