^{page 124 note *} British Association Reports for 1858.

^{page 128 note *} The species on which Loven's observations were made is named by him Campanularia geniculata. His figures, however, are undoubtedly those of Laomedea fiexuosa, whose distinctness from Campanularia (or Laomedea) geniculata of Linnaeus has been fully proved by Dr Johnston, and from L. gelatinosa of Pallas, with which Johnston confounded it, by Mr Hincks.

^{page 132 note *} Gegenbaur has already referred the medusal genus, Bougainvillea, to eudendrium as its “nurse” form, and it is evident that the little medusa here described needs only that the number of tentacles and ocelli composing each marginal group shall become multiplied, and the oral tentacles become bifurcated, in order that it may be converted into a true Bougainvillea. This change I have not witnessed, for my continued observation of the medusæ was here interrupted; but Dr Strethill Wright, who obtained the same species of eudendrium in the Firth of Forth, informs me that he has traced its medusæ into the adult Bougainvillea, with the generative elements developed in the base of the manubrium, as is well known to be their situation in this genus.

^{page 134 note *} Eighteen may frequently be counted, but this is probably abnormal.

^{page 135 note *} The medusa of Laomedea dichotoma, as here described, is probably only the young state of Gegenbaur's Eucope polystyla (Zeit. f. Wiss. Zool. Band. 8), a species which this naturalist informs us he has traced to the gonophores of one of the campanularidæ.

^{page 137 note *} In the remarkable species, Laomedea acuminata (Alder), the tentacles of the polype are actually united, as Mr Alder has shown, for a considerable distance from their origin, by an intervening membrane.

^{page 138 note *} Professor Huxley's important demonstration of the composition of the proper radiata out of two membranes, must be carefully borne in mind in all our attempts to establish relations of homology in this group.

^{page 138 note †} It is highly probable that the medusæ whenever produced among the Tubularidæ, will be found to have their generative elements formed between the endoderm and ectoderm of the manubrium; while, on the other hand, in the medusæ of the Campanularidæ and Sertularidæ, the generative elements will originate in the walls of the radiating canals, here also between endoderm and ectoderm. In the former, therefore, the medusae would approach the type of Sarsia, in the latter that of Thaumantias, or more exactly that of Eucope, Gegenb. Perhaps, however, until a greater number of instances are accumulated, it would be hardly safe to insist on the validity of this generalization.