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GENUS I. ILYANTHUS (Forbes). 
Column pear-shaped, tapering to a blunt point at 
the inferior extremity, which is probably perforated.* 
Surface smooth, without suckers, Avarts, or loopholes. 
Tentacles of one kind only, marginal, numerous 
(f. e. exceeding thirty). 
Mouth of the ordinary form, with no prominent 
gonidial development. 
* There is no evidence on this point with respect to our two British 
species. Dr. Kelaart, in his “ Description of Ceylon Zoophytes,” speaking 
of a species, which he has done me the honour to name Peachia Gossei, but 
which is evidently an Ilyanthus, says that it has “ an inferior orifice, large 
enough to admit a moderate sized probe, which gives passage to ova and 
excremeutitious matter.” {Trans, hoy. Asiatic Soc. ; Ceylon Branch.) 
ANALYSIS OF BRITISH SPECIES. 
Tentacles slender, filiform, long ; lined Pcoticns, 
Tentacles thick, conical, short ; banded Mitchdlii. 
