SERTULARIA. Loe 
bleached appearance, as if drifted for a considerable time. 
We have dredged it in Lamlash Bay, but the specimens, 
though evidently in their native locality, were not good. 
“ Height nearly a foot; stem arising from wrinkled tubes, 
which adhere to stones or shells; the cells are usually oppo- 
site, sometimes alternate, and the stems seldom exhibit any 
joints; vesicles egg-shaped, with a narrow base and a con- 
tracted subtubular summit.” (Dr. Meming.) Though gene- 
rally white, or of a pale yellow colour, specimens of a reddish 
hue are occasionally found. Those I got in Arran, and in 
the Frith of Forth, where they are abundant, were very 
much dotted with Spirordis. 
Sir J. G. Dalyell has recorded many interesting observa- 
tions made by him on this zoophyte, kept alive in Jars of 
sea-water. “It is obvious,” he says, “that two differently 
formed vesicles are borne by the 8. adietina, a fact also in- 
cident to a few other Sertularia.” 
He gives a description and figure of what he calls Sertw- 
laria abietinula, diminutive sea-fir. It bears a considerable 
resemblance to S. adietina, but he has been unable to iden- 
tify the two. It is generally from one to two or perhaps 
three inches high. He has never observed it except on old 
shells. 
