754 Proceedings of Royal Society of Edinburgh. [sess. 
In 1902, it was only taken on three occasions — two specimens 
on 11th July and a single specimen on 25th August and on 
11th October. 
Lizzia claparedei , Haeckel, is regarded by me as a stage in the 
development of Lizzia blondina. It was taken by Claparede off 
Arran in 1859. 
Margelis britannica (Forbes). (Tables I. 13 ; II. 8.) 
Hipjpocrene britannica , Forbes, 1841, p. 82, pi. i. fig. 2. 
Bougainvillia britannica , Forbes, 1848, p. 62, pi. xii. fig. 1. 
Bougainvillia britannica , Allman, 1872, pi, ix. fig. 8. 
Bougainvillia bella, Hartlaub, 1897, p. 470, taf. xv.-xvi. 
In 1901, a large adult specimen was taken on 3rd June. 
In 1902, some very early stages were taken between 22nd 
March and 25th April, but I am not quite sure about the 
identification. On 11th July a large adult was taken. 
Description of the specimen taken on 3rd June 1901 : — 
Umbrella somewhat conical in shape and very thick, about 7 mm. 
in length and width. Stomach with perradial lobes. Oral 
tentacles contracted. Gonads (female) surrounding the lateral 
wall of the stomach, isolated perradially into four groups. Four 
perradial groups of tentacles, situated upon large compound 
U-shaped basal bulbs, each basal bulb with twenty-three to 
twenty-four tentacles. Basal bulbs situated in niches on the margin 
of the umbrella. Ocelli dark brown (in formalin), one at the base 
of every tentacle. 
Description of the specimen taken on lltli July 1902: — 
Umbrella somewhat conical in shape and very thick, about 
7 mm. in length and 5 mm. in width. Stomach with four 
perradial lobes. Four oral tentacles, about four to five times 
dichotomously branched ; the terminal branches long and slender, 
ending with very small knobs containing nematocysts. Gonads 
(male) surrounding the lateral walls of the stomach, isolated 
perradially into four groups. Four perradial groups of tentacles, 
situated on large compound Y-shaped basal bulbs, each basal bulb 
with eighteen to twenty tentacles. Ocelli dark brownish to black, 
one at the base of every tentacle. 
In 1897, Hartlaub described Bougainvillia bella as anew species 
