Linnaan 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 : — 



• ''''^' ""^^-^ ri^''^ ^" Ord. BORAGINE^. 

 ■tPtp v) 1-r- . Gen. Galapagoa, Hoolc.fil. 



gjjQpt/^ 4T5-partitus ; laciniis linearibus. Corolla infundibuliformis ; tubo 



^ lato ; limbo 5-fido patente ; fauce iiudft. Stamina 5, inclusa, imo co- 



rollae tubo inserta. Ovarium 4-loculare. Stylus terminalis, ad basin 



*" usque bipartitus ; stigmata 2, obtusa. Semina pendula ; albumine parco, 



^' carnoso; cotyledonibus planis ; radiculS, majuscule, supera. — ^Herbae 



.'f Insularum Galapagos^ hisjndo-pilosts. Caules prostrati, ramosissimi. 



.«o Folia allerna, coriacea, versus apices ramulorum densissime conferta. 



Floras parvi, in axillis foliorum omnino sessiles, valde inconspicui. 



Obs. Genus Ehretiearum inter Coldeniam et Rhabdiam (secund. clariss. 

 Bentham) medium, ob stylum bipartitum staminaque fundo corollae inserta 

 singulare. , 



loditip Qj.j SOL ANE.E. '^■'^'^"r- 



/d .^o,T«1..nf T^ Gen. DicTYocALyx,i7oo^.//. 



5;Ca/ya; cylindraceus, 5-fidus; lobis acutis; tubo post anthesin subinflato, 

 ,,. membranaceo, reticulatim venoso. Corolla membranacea, subinfuudi- 

 buliformis; tubo gracili gradatim supern^ ampliato ; limbo pHcato, 

 brevi, vix explanato. Staminvm flamenta elongata; antherae inclusae. 

 Ovarium disco carnoso insertum ; stigmate capitato. Capsula evalvis, 

 indehiscens, bisulcata, incomplete 4-locularis, calyce ventricoso inclusa. 

 Semina, plurima, majuscula, tuberculata, dissepimenti medio prope 

 angulum parietalem affixa ; testa nitida, obscure granulata. Embryo 



