228 THE NORTH-AUSTRALIAN EXPEDITION. 



outer series being sterile and the largest ; the cells of the capsule seem 

 always one-seeded, with a wing round the seed ; the leaves are ternate 

 and linear. Another new genus, Lithomyrtus, MSS., differs from 

 Psidium in a dry berry and a circinate embryo. An undescribed Di- 

 semma differs from the rest in five- (not ten-) cleft calyx, and in the 

 extremely short corona. It is a rare climber of the Burdikin-banks. 



Amongst Cucurbitacea , which I fortunately have been able to exa- 

 mine in a recent state, I established a new genus, Cucurbitella, seem- 

 ingly next to Sicydium ; added a Lttffa, from which the Victoria Biver 

 species differs in forming five sacculate protrusions at the base of the 

 calyx, and in prickly-tubercled fruits ; two species of Trichosanthus, hav- 

 ing none of that disagreeable odour which marks the otherwise splen- 

 did species from North-west Australia ; and Bryonia laciniosa ? or an 

 allied species, but different from B. affinis, EndL, from Norfolk Island, 

 so that we are now acquainted with twelve species of this Order from 

 Australia, of which none are found in West Australia. * 



Rosacea do not exist beyond the Tropic of Capricorn in Australia ; 

 but on the east coast I have obtained, through Mr. Moore, a dioecious 

 Rubus, like R. australis, from which it differs principally in ovate 

 bracts, and stamens shorter than the calyx; and a second unknown 

 kind, discovered by Mr. Hill, closely allied to R. Lambertianus. Of 

 Bauer a nothing exists in the north, but I re-examined such materials 

 as the public collection of Sydney afforded me, and feel inclined to re- 

 tain B. microphylla> Sieb., and B. capitata, Ser., as distinct from B. 

 rubioides. I believe also that B. Billardieri must be confirmed as a 

 species, but I had not a single specimen at hand for comparison, the 

 species being seemingly restricted to Tasmania and Victoria. But 

 although the distinctions drawn between these four species (in this in- 

 stance principally upon the form of the anthers), admit of doubt, still 

 there can be only one opinion on the stability of the characters of B. 

 sessiliflora, as pointed out in the Victoria Philosophical Transactions ; 

 indeed it is with scruples that I retain this plant in the genus at alL 

 since the ovary is totally enclosed in the tube of the calyx, one-celled 5 

 biovulate, with pendulous ovules, one only fertilized, and I little doubt 

 that the capsule, which I have not seen ripe, will dehisce only unila- 

 terally, since there. is only a suture on one side of the ovary. Thus 

 Bauera sessili/iora brings its genus into close contact with Ceratopcta- 

 lum. Bauera sessiliflora is the most western species of the genus (not 



