518 VESICULARIID^J. 



shorter towards the upper extremity of the group, and 

 imitate in their arrangement " the antique figure of Pan's 

 pipe." The surface, both of the stem and cells, is 

 speckled. 



Genus BOWERBANKIA, Farre. 



Der. Named in honour of Dr. Bowerbank. 



BOWERBANKIA, Farre, Phil. Trans. (1837) : Johnston : Van Benedcu : &c. 

 SERTULARIA (part.), Adams : &c. 



VALKERIA (part.), Johnston, B. Z. ed. 1 : Hassall : Couch. 

 SKUIALAKIA (part.), Templeton. 



GENERIC CHARACTER. ZOCECIA ovate, disjunct, clustered, 

 often subspirally arranged. ZOARIUM repent or erect. 

 POLYPIDE with a small number of tentacles (8-10) and a 

 gizzard. 



THE genus Bowerbankia, as founded by Dr. Farre, was 

 distinguished from Valkeria auctt. by the possession of 

 a gizzard, and embraced a single species. We now know 

 that there is a wider range of difference between these two 

 forms ; and it has been necessary to remove the latter to 

 a distinct group ( Campy lonemida], of which it constitutes 

 the type. 



In his genus Valkeria, Dr. Johnston has included 

 the Sertularia pustulosa of Ellis and Solander ; but 

 this form is furnished with a gizzard, and agrees with 

 Bowerbankia in the arrangement of the tentacles and in 

 general structure, and should undoubtedly be united with 

 it. The slight difference between them in the number of 

 arms (the one has 10 and the other 8) is a point of no 

 special importance. One or two other species have oc- 

 curred since Johnston's time, which bear a general re- 

 semblance to B. pustulosa, and will rank with it in the 



