TUBULA1UA INDIVISA. 117 



terior surface, and terminate above in a single cavity at 

 the base of the lower tentacular verticil*. 



This beautiful zoophyte has a wide range bathymetri- 

 cally, being found on rocks between tide-marks, and in 

 shallow water near shore, and also at great depths (140 

 fathoms, off the Mull of Galloway, Beechey] . 



The T. gigantea of Lamouroux, which reaches a height of 

 from 12 to 15 inches, was referred by Dr. Johnston to the 

 present species; but Mr. Alder, who obtained it on the 

 Northumberland coast, was of opinion that it might prove 

 distinct, and certainly required further examination. 



Hob, On rocks between tide-marks and in shallow water, 

 and on shells, stones, &c. from deep water : common and 

 generally distributed. 



It often covers profusely the sides of rocks and the 

 under surface of ledges a little above low-water mark, 

 hanging from them in unsightly tufts when the tide is out, 

 but rising into sudden beauty with the return of the water, 

 and clothing them with all the gaiety of a garden. On the 

 pontoons of the great landing-stage at Liverpool it must 

 grow in wonderful luxuriance, and present a rare spectacle 

 of zoophytic beauty. I shall not soon forget the bucketful 

 of this zoophyte, in the finest condition, which Mr. Moore, 

 the able Curator of the Free Museum in that town, procured 

 for me from this locality. 



Dr. Collingwood informs me that in February he has 

 taken specimens from the landing-stage " having pendent 

 clusters of ova two inches long." In summer, he adds, 

 this zoophyte " appears to offer a favourite feeding-ground 

 for Dendronotus arborescens." The Dingle rocks, also in 

 the Mersey near Liverpool, are covered, as I learn from 

 the same gentleman, at low-water mark and below it, with 



* Dr. T. S. Wright, " Observations on Brit. Zooph.," Eel. N. P. Journ. 

 (N. S.) for Jan. 1858 ; Agassiz, N. H. U. S. vol. iv. L'07. 



