HALECIUM PLUMOSUM. 227 



often strongly ringed at intervals, irregularly branched, 

 branches given off at the base of the calycles, sometimes 

 singly, sometimes in pairs ; HYDROTHEC^E funnel-shaped, 

 gracefully everted at the margin, often of considerable 

 length, in many cases a number (frequently 4 or 5) 

 rising one within another; GONOTHEC.E ovate, smooth, 

 borne on short pedicels and occurring singly. 

 Height of fine specimens from \ to ^ an inch. 



THIS very beautiful species is remarkable for its extreme 

 slightness and delicacy. There is much variety in the 

 amount of annulation on the stems and branches ; some- 

 times, as in the specimens from which my first description 

 was taken, they are almost smooth, in other cases they 

 are distinctly and very elegantly ringed. A simple 

 calycle is rarely met with on mature specimens. Gene- 

 rally the polypite protrudes from the uppermost of a pile 

 of little cups, with prettily everted rims, which fit one 

 into the other. 



The capsules vary in form, being broadly ovate, or 

 slender and somewhat pointed above; they contain a 

 single, large gonophore. 



Hub. On zoophytes and Polyzoa. Salcombe Bay, Devon, 

 on Salicornaria farciminoides ; Filey (T. H.): Northum- 

 berland, on Tubularia indivisa and Sertularia abietina, from 

 deep water (J. A.) . 



6. H. PLUMOSUM. 

 Plate LXIV. fig. 1. 



SHOOTS tall and slender, flexible, sparingly branched; STEM 

 and branches compound, tapering, pinnate ; pinnce alter- 

 nate, placed at regular intervals, simple, delicate, some- 

 times bearing a few pinnules, divided by oblique joints 

 into very short and somewhat wedge-shaped internodes ; 



