100 MEMOIR V. 



the vesicles being confluent or united together by their sides^ 

 either in interrupted series or apparently continued lines. 



Time and more accurate observation will no doubt add 

 many more species to the above Genera, even from amongst 

 the Sertularise already known ; thus the Sertularia cedrina, 

 obsoleta and pinus of Gmelin are probably Vesicularise, as 

 well as Sertularia uva of Ellis which might be considered 

 as the young state of Vesicularia imbricata but for the state- 

 ment of that acute observer, that the animals possess only 

 eight arms, whereas in the latter they are provided with 10- 



