Linnean Society. 357 
sules of Mosses, and observes that the separation of the calyptra 
affords a plain example of the operation of his third principle; but 
with regard to the nature of the operculum, although he has an hy- 
pothesis under consideration, his mind is not yet satisfied. He states 
his object in the present paper to have been the investigation of the 
immediate physical causes of certain known effects, but he has not 
thought this the place even to touch upon their ultimate causes or 
the ends to accomplish which they are apparently designed, and 
which adapt them to the position and general structure of the parti- 
cular plant. 
Read also the conclusion of Dr. J. D. Hooker’s ‘“‘ Enumeration of 
the Plants of the Galapagos Islands, with descriptions of the new 
species.” 
In a brief introduction Dr. Hooker offers his acknowledgements to 
Mr. Darwin, by whom the collection on which this enumeration is 
chiefly founded was made, and to Prof. Henslow, in whose charge 
the collection had been placed, and who kindly relinquished his in- 
tention of publishing the novelties contained in it in favour of the 
author. He also notices the striking peculiarities which mark the flora 
of the Galapagos group, the plants composing which not only differ 
in a great degree from those of any other country, but are in many 
cases peculiar to the separate islands, although in those instances 
frequently representatives of others which are found on different 
islands. 
The number of species enumerated is two hundred and twenty- 
eight. Of these upwards of a hundred are described as new, and 
six new genera are established, the characters of which are given as 
follows :— 
Ord. BORAGINEZ., 
Gen. Garapacoa, Hook. fil. 
Calyx 4—5-partitus; laciniis linearibus. Corolla infundibuliformis ; tubo 
lato; limbo 5-fido patente; fauce nuda. Stamina 5, inclusa, imo co- 
rollz tubo inserta. Ovarium 4-loculare. Stylus terminalis, ad basin 
usque bipartitus ; stigmata 2, obtusa. Semina pendula ; albumine parco, 
earnoso; cotyledonibus planis; radiculA majuscula, supera.— Herbee 
Insularum Galapagos, hispido-pilose, Caules prostrati, ramosissimi. 
Folia alterna, coriacea, versus apices ramulorum densissimé conferta. 
Flores parvi, in awxillis foliorum omnino sessiles, valdé inconspicut. 
Obs. Genus Ehretiearum inter Coldeniam et Rhabdiam (secund. clariss. 
Bentham) medium, ob stylum bipartitum staminaque fundo corollz inserta 
singulare. 
Ord. SOLANEZ. 
Gen. Dictyocatyx, Hook, fil. 
Calyx cylindraceus, 5-fidus; lobis acutis; tubo post anthesin subinflato, 
membranaceo, reticulatim venoso. Corolla membranacea, subinfundi- 
buliformis; tubo gracili gradatim superné ampliato; limbo plicato, 
brevi, vix explanato. Staminum filamenta elongata; antherz incluse. 
Ovarium disco carnoso insertum ; stigmate capitato. Capsula evalvis, 
indehiscens, bisulcata, incompleté 4-locularis, calyce ventricoso inclusa. 
Semina plurima, majuscula, tuberculata, dissepimenti medio prope 
angulum parietalem affixa ; testa nitida, obscuré granulata. Embryo 
