]^^ 



NOTE ON ATRIAL, 

 OR CIRCUMGLOAGAL, TENTACLES IN ÏHE TUNIGATA 



PROF. W. A. HERDMAN, F. R. S. 



In the interesting and important paper bv mv friend M. le D"" 

 Gharles Julin, wliich forms the first part of bis « Les Ascidiens dos 

 côtes du Boulonnais (1) », I notice it is stated, on p. 30 : « L'exis- 

 tence d'une couronne de tentacules circumcloacaux n'a jamais, à 

 ma connaissance du moins, été signalée chez aucune espèce d'As- 

 cidien simple ou composé ». If it lias escaped Julin's attention that 

 I described and figured atrial tentacles in 1882 in a simple Ascidian 

 and in 1886 in a compound one, then I fear it may hâve escaped 

 notice altogether, perhaps because along with some other anato- 

 mical observations and some theoretical conclusions and suggestions 

 it is buried in the « Challenger » Reports in a mass of detailed 

 descriptions of new species. At any rate the existence of atrial 

 tentacles is evidently so little known tliat tliis brief note upon what 

 I hâve seen of them may be of interest. 



(Ij liulbiln scientifique, tome XXIV, p. 208, 1892. 



