196 
BUNODID.E. 
the yellow mark is broader and near the mouth ; in the others, it is more 
slender, longer, and reaches to the tentacular region. 
Tentacles. Pellucid grey, with the front 
face olive, on which are scattered numerous 
spots of opaque white : these spots are gene- 
rally roundish, or polyhedral, and large and 
TENTACLE Small oues are crowded together. 
{lateral view). Mouth. Blackish, with the gonidial tuber- 
cles of a more intense hue. 
Size. 
Button an inch and a quarter in diameter, elongating to a height of 
two inches ; expanse of flower two inches. 
Locality. 
Both sides of the Bristol Channel ; rock.s within tide-marks. 
Varieties. 
a. llygroxyla. The green condition described above. 
0. Xeroxyla. Column dingy brown, with slightly darker warts ; disk 
of the same tint ; marked as in a. 
y. Caustoxyla. Column reddish chocolate, with darker warts ; disk dark 
olive ; marked as in a ; the central half sometimes white. 
I first discovered this species at Lidstep, on tlie coast of 
Pembroke, in 1854, and described and figured it in “ Tenby ; 
a Seaside Holiday.” Very little has been added to its 
recorded history since that time ; not more than four speci- 
mens having occurred, so far as I am aware, to subsequent 
researches, all of which were obtained near Ilfracombe. 
Tliough manifestly a rare species, I was so fortunate as 
to light upon a numerous colony at its discovery. About 
a dozen individuals of different sizes were associated in the 
dark angles and pools of a little insular rock exposed at 
spring-tide, that lies just off the cove called the Drocli, 
near Lidstep. They were not troglodyte in habit, but 
adherent to the open rock, and therefore easily detached. 
The species seems social ; clustering together in group.^, 
mutually pressing each other’s sides. 
The habits of the Glaucous Pimplet in captivity are 
