EASTERN COAST OF THE UNITED STATES. 27 



The species of this genus appear to live buried to the tentacles in mud or sand. The 

 terminal pore has not been observed in all of them. 



Ilyanthus ehloropsis Agassiz, MS. 

 Actinia ehloropsis Agassiz, MS. (1849). 



Body when fully expanded elongated and rather slender, tapering to the base, capable of 

 involving the tentacles and contracting into a short obovate form. Base narrow with a 

 rather large terminal pore. Walls thin, smooth, firm in texture. Tentacles short, pointed, 

 numerous, arranged in several rows ; mouth long and narrow ; disk fiat. 



Color of column light bluish green, somewhat diaphanous, with lighter longitudinal 

 striatums ; tentacles light yellowish green with a white spot at base and a white line on 

 each side ; disk yellowish green ; mouth bright yellow. 



Length, in expansion, 3.50 inches; breadth, .75 ; when contracted in alcohol, length, 1.25; 

 breadth, 1.00. 



Charleston, S. C. (L. Agassiz). 



This species appears to be very rare. The only specimen known is in the collection of 

 the Museum of Comparative Zoulogy. 



Ilyanthus laevis Vehrill. 



The form of this species when partly contracted in alcohol is elongated, obconical, taper, 

 ing below to an obtuse point. Column smooth, marked by faint longitudinal lines corre- 

 sponding to the internal lamelke. Tentacles, thirty-six, placed about one tenth of an inch 

 within the margin of the disk, and arranged in two imperfectly defined rows ; they are 

 slender, moderately long, acute at the ends. The summit of the column forms, outside of 

 the tentacles, a thin marginal expansion, having its edge crenulated with small rounded 

 teeth. The base does not appear to have a terminal opening. Length of the column, 1 

 inch ; greatest diameter, .25; length of tentacles, .15. Color unknown. 



Eastport, Me. (L. Agassiz). 



The only specimen that I have seen is preserved in alcohol in the Museum ; therefore, the 

 description of this interesting species must remain, for the present, very imperfect. It 

 differs from I. scoticus Forbes, specimens of which, collected at Oban, Scotland, by Dr. 

 Stimpson, are also in the Museum of Comparative Zoology, in its more slender and 

 elongated form and shorter tentacles, as also in having a broad margin of the disk outside 

 of the tentacles. In the last character it agrees with I. Mitchdlii Gosse. 



'-' 



Genus Edwardsia Quatrefages. 



Edwarrtsia Quatrefages, Mem. sur les Edwardsies, Ann. Sci. nat, ser. 2,xviii. p. 65 (1842). 

 Scolanthus Gosse, Ann. and Mag. of Nat. Hist., 2d ser. xii. p. 157 (1853). 



Column very slender, elongated, the upper and basal portions thin and membranous, the 

 middle region covered by a thick epidermal secretion, forming a tube into which the mem- 

 branous portions may be contracted. Base capable of being distended, and when in that 

 state of adhering slightly by its surface to rocks, etc. ; at other times tapering to a point. 

 Tentacles slender, marginal, in three or four cycles, the third sometimes incomplete. 



