126 SAGARTIAD^. 



In the only specimen in which I have had an opportunity of examining 

 the mouth with exactitude, there was only one gonidial groove, with its 

 pair of tubercles. And this was so placed, as to make the bisecting line of 

 which it formed the termination, one at right angles to the lateral develop- 

 ment of the animal into lobes. 



A contia. Long and thick ; emitted in great profusion, on the slightest 

 irritation. 



Colour. 



Column. Sienna-brown, or reddish-brown on the outer portions, marked 

 with bluish longitudinal lines, and gradually melting into the purest white 

 on the upper third ; the whole studded with large round spots of the most 

 brilliant purplish-rose, which are most distinct in the middle third. 

 Margin surmounted by a line of delicate pale scarlet, crowning the parapet. 



Disk. Pure white. 



Tentacles. White, with a faintly-dark core. 



Mouth. White. 



Acontia. Rose-lilac, with the suture, formed by the edges of the 

 infolded ribbon, white. 



Size. 



Large specimens attain two inches and a half in diameter, measured from 

 edge to edge along the curve, as they adhere to the shell ; but the long 

 diameter of such individuals, if measured from the suture round the ring, 

 along the line of the disk, to the suture again, would be not less than five 

 or six inches. The height from the parapet to the surface of the shell is 

 about one-third of an inch. Tentacles one-third of an inch in length. 



Locality. 



The coasts of Europe generally. Deep water. " They seem to love a 

 muddy bottom, mixed with gravel and dead shells." (D. R. in litt.) 



Varieties. 



a. Rhodopis. The condition described above. (Plate III. fig. 7.) 

 /3. Crinopis. Whole body pure white ; unspotted (Forbes); or marked 

 with a few scattered, mostly minute, pink dots. r (P. H. G.) (Plate III. fig. 8.) 



The name of this genus was assigned to it by the late 

 Edward Forbes in honour of John Adams, who first 

 described the animal as British. It had, however, been 

 described and figured by Bohadsch before him, and by 

 many since, " both at home and abroad," and by no one 

 more accurately than Dr. Coldstream, the principal parts of 

 whose account are cited in Johnston's " British Zoophytes," 

 (Ed. 2, p. 207.) The true character of the animal has been 



