324 Scientific Proceedings, Royal Dublin Society. 



thought, in its structure with the genus Sagartia, He accordingly 

 rejected the family Bunodidae, relegated the genus Bu nodes, to the 

 Sagartidae, and established a new family Tealidae, of which he 

 made Tealia crassicomis the type, assigning as the most important 

 character of the family the possession of a strong endodermal 

 sphincter. In the Supplement to the " Challenger " Eeport, Pro- 

 fessor Hertwig, for reasons there stated, withdrew the name Tealidae 

 in favour of the older designation, Bunodidae, which has been 

 adopted by Andres in his great monograph. Professor Hertwig, 

 however, still maintains that the endodermal sphincter should 

 occupy the first place in the diagnosis of the family. In the family 

 so defined by these three authors the forms mentioned in this Paper 

 must be included. But it is remarkable that if the family be a 

 natural one, it contains forms so widely separated as far as the 

 numerical arrangement of their parts is concerned. It would be, 

 indeed, surprising if an adult Tealia crassicomis with its parts in 

 multiples of five, an adult Bunodes verrucosa with its parts in multi- 

 ples of six, and an adult Bunodes thallia with no apparent nume- 

 rical symmetry, should be relegated to the same family. 



