CIRRHOPODA. 439 



M. Delamarck, under the name of Coronul^, separates the very- 

 wide species, where the parietes of the cone are occupied by cells 

 so large that they resemble chambers(l); and under that of 



TuBiciNELL^, those in which the tubular portion is elevated, 

 narrower near the l)ase, and divided into annuli, which mark its 

 growth(2). 



There are some species of these last two subgenera, which affix 

 themselves to the skin of the Balaenae, and even penetrate into their 

 blubber. 



To the preceding subgenera must be added the 



DiADEMA, Ranz. 



Where the tubular portion is almost spherical, and which has but 

 two small valves almost hidden in the membrane which closes the 

 operculum. The opercular valves would not effectually close the 

 orifice without the membrane which unites them. 



They also live on the Balasnae, and Otiones are frequently observed 

 attached to their surface(3). 



(1) Lepas halsenaris, L., Chemn., VIII, xcix, 845, 846; — L. testudinarius, Ih.^ 

 84:7, 848, which attaches itself to the shell of Toi'toises. 



(2) The Tubicinella,'Lnm., Ann. duMiis.,I, xxx, 1, 2. 



(3) Lepas diadema, Chemn., VIII, xcix, 843, 844. 



