SERTULARIAD.E. 



465 



cells, between which there is a small denticle. The vesicles are 

 spinous both when filled with ova and when empty, Mr. Peach has 

 observed it from September to December laden with them, and has 

 found them to be constant to their character, hence the species is 

 probably a good one. It is one of Mr. Peach's interesting additions 

 to our Fauna ; and from his letters and drawings I have taken my 

 account of it. 



Fig. 



Fig. 



Plumularia pinnata, setacea, and echinulata have this in common, 

 that they often produce a great number or a mass of entangled root- 

 fibres, and vesicles pullulate from these more abundantly by far than 

 from the rachis of the polypidom. Herein these species resemble 

 the allied Campanularise. Mr. Busk has sent me a very neat draw- 

 ing of Plum, setacea in this state. (Fig. 81.) The specimens were 

 attached to Chorda filum, and on looking over a great many Mr. 

 Busk could not find one with axillary vesicles on the rachis, while 

 they were in profusion on the non-polypiferous fibres. " The vesicles 

 also do not appear to be quite smooth, but to have probably four 

 protuberances near the summit." Busk in lit. Sept. 26. 1846. 



PLUMULARIA CATHARINA, p. 97. 



" In P. Catharina there is a cell upon every alternate joint : on 

 the internode there are generally two cellules : that which bears the 

 cell has also a cellule at its base, and two lateral processes about the 



