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GENUS I. ILYANTIIUS (Forbes). 



Column pear-shaped, tapering to a blunt point at 

 the inferior extremity, which is probably perforated.* 

 Surface smooth, without suckers, warts, or loopholes. 



Tentacles of one kind only, marginal, numerous 

 (i. 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. Roy. Asiatic Soc. ; Ceylon Branch.) 



AXALYSI3 OF BRITISH SPECIES. 



Tentacles slender, filiform, long ; lined Scoticus. 



Tentacles thick, conical, short ; banded Mitchellii. 



