266 
ILYANTHID^. 
tentacles ; but it has- a certain power of crawling also ; for 
these organs are strongly adhesive throughout, and the 
animal, attaching itself by these means to foreign bodies, 
slowly draws itself forward. 
The gular tentacles are usually projected, and clasped 
together, but sometimes they are horizontally spread. In 
the latter case, if touched, they are instantly drawn to- 
gether, and slightly contracted, but never retracted ; they 
have no adhesive power. The appearance and situation of 
these organs have suggested to my mind the thought that 
possibly they may be the lobes of a conchula, in which case 
the animal would be a swimming Peackia: if, however, 
tliey are true gular tentacles, then the alliance is obvious 
with the 'following genus Cerianthus. May it not possibly 
be the immature condition of this latter?* 
There are discrepancies in form and colour, and especially 
in size, between the specimens seen on om’ own coast, and 
those described by Mr. Sars, which make it possible that 
these may constitute two species. We trust other speci- 
mens may clear up this and other questions of interest. 
Forbes found a species of the same genus abundant in the 
Grecian Seas, but whether identical with this, we are not 
informed. 
The internal structure, which, from the transparency of 
tlie integuments is clearly seen, presents nothing peculiar. 
? Peachia. 
Acalepha. albida. Anthea. 
? Cerianthus. 
* See M. Haime’s observations on the free-swimming young of Cerian- 
thus, infra, p. 273. 
