C0:\IPAEAT1VE ANATOMY OF SOME BRITISH ACTINLE. 537 



warts — the acrorhagi. The warts get smaller in the region near the base, 

 as shown in the figure included by Gosse in his paper. Many of the 

 vertical rows of warts die out rapidly downward, while even the primary 

 rows become faint and the warts distant ; the whole of the intervening 

 space is wrinkled (probably owing to the animal being partially con- 

 tracted). 



Tentacular disk : diameter exceeding that of column ; mouth rather 

 large, lips somewhat pouting, gonidial tubercles or acrorhagi prominent 

 and inflated. 



Tentacles stout, lax, of no great length, tapering but slightly to an 

 obtuse tip, conical during contraction. When the animal is not fully 

 expanded there is a distinct fosse between the margin of the warted 

 column and the base of the tentacles. Tentacles contractile, but not 

 retractile, bear a considerable resemblance to those of Aiptasia, Owing 

 to the laxity of the tentacles it was extremely difficult to make a correct 

 enumeration, or even to determine the number of series. There appear 

 to be about a hundred tentacles, probably in the order 6+6 + 12+24+48 

 =96. Fragments of sand adhered to the column wall, this suggests the 

 presence of either numerous small suckers or adhesive mucus. 



Colour : pedal disk pale yellowish white with a few small red streaks. 



Column pale yellowish green, but so thickly covered with minute 

 irregularly shaped red specks as to appear brick-red to the naked eye ; 

 only a few specks can be distinguished without a lens. There are also 

 longitudinal series of larger spots of clear yellow-green, each with a bright 

 red central dot ; these spots are irregularly shaped and are well spaced 

 in the series, nearer together and more prominent near the summit, 

 where they are seen on the warts. The acrorhagi are of a leaden grey 

 hue with several dull red spots on each. There are fifteen or sixteen of 

 these red-centred spots in each linear series, and the spots are connected 

 by faint lines of yellow-green. There is also a number of intermediate 

 series of these red-centred dots on the upper part of the column, but 

 these soon die out lower down. Thus the column possesses 24 longitu- 

 dinal pale greenish yellow stripes, each of which contains 15 to 16 spots 

 of a brighter yellow colour, with a bright red central dot. 



Tentacular disk : stomatodaeum white, lip pale grey. Disk iridescent, 

 umber or bluish green (according to the incidence of light) succeeded by 

 an indefinite area of dull greyish white. The tentacle bases are of a 

 nmch darker umber, the gonidial radii are fairly well demarcated and 

 the mesenteries appear as faintly marked radial lines. 



Tentacles umber, the inner faces shaded with iridescent purple. 



NEW SEllIES. — VOL. X. NO. 4. MAY, 1915. 2 M 



