274 
ILYANTHID^. 
period, and I had no opportunity of seeing their segmen- 
tation. All were strongly ciliated, and therefore were 
already larvae. They were oval in form, § millim. in 
length. One end becomes concave, the other conical. 
In the centre of the former an opening forms, through 
Avhich granules escape, and this becomes the mouth ; the 
escape of the granules leaving the visceral cavity. Soon 
around the mouth four minute tubercles bud, whicli become 
tentacles ; then two other tubercles nearer the mouth form 
lips ; meanwhile the body becomes smooth, and cylindro- 
conical. 
“ The young lived in this state ten or twelve days ; and 
attained one or one and a half millimetre in length. The 
body continued entirely ciliated, and was become very con- 
tractile. They swam freely in the manner of a Medusa. 
mouth downward, by means of elongations and shortenings 
of the trunk, and by openings and closings of the ten- 
tacles. Sometimes they would oscillate, or revolve on 
themselves.” 
Arachnactis. 
Lloydii. Cyathopliylliadje. 
[membranaceus.] 
I^Ckrianthus (?) VERMicuLARis (E. Forbes). 
Dr. Johnston, in liis “Brit. Zooph.” Ed. 2, p. 222; pi. 
xxxviii. figs. 2 — 5, has described and figured, on the 
authority of E. Forbes, under the name of Act. vermicu- 
laris, what seems either the young of the preceding- 
species, after it has become stationary, or else a near 
ally to it. It is described as “ OA long,” and the larger 
