206 
preserved ectoderm the verrucae are of the same structure as in 
Urticina. The mesogloea of the column is of ordinary thickness, 
15 
Fig, 15, 16. Bunodactis rubrO'fiisca. Transverse sections of sphincters. Tentacle side 
to the right (fig. 15) on the left (fig. 16). 
the circular muscles of usual development. The sphincter is rather 
weak to ordinarily developed. In three specimens, one from each 
of the three localities, it was palmate-circumscript (textfig. 15) in 
