1848.] Linnean Society, 3 



communication accompanying the exhibition, that he had never before 

 observed any similar variety of the species above named, nor could 

 he find any account of its having been known to vary with a double 

 flower. Sir J. E. Smith, however, in his ' English Flora,' states of 

 Anthemis nobilis, that " varieties with double flowers are common 

 in gardens ;" and in Smith's own herbarium, in the Museum of the 

 Society, are two specimens of Pyrethrum inodorum, var. flore pleno, 

 the flowers of which very strongly resemble those exhibited. These 

 were found in Norfolk by Mr. Crow^e in 1799, and are mentioned in 

 the ' English Flora ' as " a double variety, having a multiplied ra- 

 dius and an obliterated contracted disk." In the present example 

 Mr. Hogg states that " the external white petals, or rather the florets 

 of the radius, are altogether larger and stronger ; they are much 

 elongated, strap-shaped, less narrow, with their margins somewhat 

 folded inwards, and are rather more numerous than those in the ordi- 

 nary single flower, from which they also differ by being sometimes 

 bilabiate ; whilst the disk itself is greatly contracted and reduced, 

 and its tubular florets appear to have become very small and abor- 

 tive ; thus apparently indicating that the florets of the radius have 

 become lengthened and enlarged at the expense of those of the disk." 

 Mr. Hogg adds, that in general appearance these large double flowers 

 of Matr. Chamomilla resemble the common white double flowers of 

 the genus Chrysanthemum. 



Read the commencement of a memoir " On the Anatomy and 

 Physiology of Physalia, and on its place in the System of Animals." 

 By William Huxley, Esq., Assistant-Surgeon of H.M.S. Rattle- 

 snake. Communicated by the President. 



December 5. 



E. Forster, Esq., V.P., in the Chair. 



Thomas Robert N. Morson, Esq., was elected a Fellow. 



Mr. J. O. "Wlestwood, F.L.S., exhibited a new species, of large 

 size, of the genus Achias, Fabr., of which two species only were 

 hitherto known. 



Read the conclusion of Mr. Huxley's memoir on Physalia, com- 

 menced at the last Meeting. 



