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DUBLIN UNIVERSlTr 



ticed. These were, probably, tentacles in a rudimentary condition. No 

 ocelli or marginal vesicles could be detected. 



A membranous veil seemed to separate the interior portion, where 

 the peduncle was placed, from the exteiior. This was transparent, and 

 seemingly elastic, and at times was drawn up towards the sides, and the 

 peduncle protruded. The creature sometimes stood on its head, if the 

 apex may be so termed, and then, contracting its length, and pushing out 

 the peduncle, seemed as though it were about to perform the singular 

 gymnastic feat of turning itself inside out. 



The large size of the central peduncle, with its convoluted ovaries, 

 and its rich crimson tint, rendered it the most conspicuous part. Its 

 form was ever varying as it' moved rapidly through the water. When 

 looked at from above, there were times when, in its contracted state, it 

 presented the appearance of a splendid Maltese cross. 



a, Turris constricta, seen in profile ; b, the same, viewed from above ; c, part of a 

 muscular band ; d, portion of the lining of swimming bell; c, portion of the marginal 

 canal, showing three tentacles, between two of which a rudimentary tubercle (tentacle ?) 

 may be seen. 



The movements when swimming were vigorous and graceful. With 

 each contraction of the motor tissue a portion of the transparent outer 

 margin was protruded, and by its appearance and disappearance added 

 another peculiarity. 



