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BIBLIOGRAPHY. 
Under the Spatoglossece the genus Spatoglossum of Kiitz. is 
retained, reserving in it, however, only those species in which the 
uppermost layer of cells radiate in a flabellate manner towards the 
margin. Two new species from Australia, viz., Sp. cornigerum 
and Sp. grandi folium, and one from Ceylon, S. asperum (Ferguson, 
Alg. Ceylon, No. 54 in Herb. Ag.), are added, and the Sp. 
Schrcederi of Kiitzing becomes Sp. Areschougii , the name of Sp. 
Schrcederi being retained for Merten’s plant (Ulva Schrtnderi, Mert., 
in. Mert. PI. Crypt., Tab. ii., fig. 3), which has a firmer frond, more 
coarsely toothed. The genus Dictyota is now divided into four 
sub-genera and eleven tribes, the former characterized by different 
arrangements of the fructification, and the latter by differences in 
branching and in the presence of a more or less distinct stem. 
In the first sub-genus, Platydictyon , the organs of fructification 
are scattered over the frond ; in the second, Pleiadophora , they 
form oases with larger spaces between; and in the third, Strigo- 
carpus, they are arranged in a more or less regular interrupted 
line with single fertile cells interspersed ; and in the fourth, 
Neurocarpus , they form a nerve-like line in the middle of the frond. 
Eight new species are described, six from Australia, one from 
New Zealand, and one from California. These are D. alternifida , 
D. apiculata, D. bifurca , D. fenestrata, D. latifolia, D. robusta, 
D. vittarioides, D. ocellata, D. Binghamice. 
Two of Harvey’s species receive new names, D. dichotoma, Harv. 
Alg. Aust. exs., No. 70 (partim), becoming D. apiculata , and D. 
ncevosa, Harv., Phyc. Aust., tab. 186 ( non Suhr.), being identified 
with D. Diemensis, Lond. A new genus, Pachydictyon, is formed 
to receive D. furcellata, Harv. (Phyc. Aust., tab. xxxviii.), D. 
minor, Lond, and D. paniculata, Auct. To the genus Dilophus 
five new species are added, viz., I). fasciculatus, D. tccniceformis, 
D. moniliformis, D. foliosus, and D. tener, all of which are 
Australian. 
In the Siphonece , a subgenus of Codium is formed under the 
name of Raphioplea, to receive the species in which the utricles of 
the outer layer of the frond are elongated and cylindrical, with a 
stricture below the apex forming a subglobose head. This section 
receives C. spongiosum, Harv., and a new species from Australia, 
viz., G. pomoides. One new Halimeda, H. rectangularis , allied to 
H. monile, Lam., and U. cylindracea, Dcsne., but differing in having 
rectangular articulation, ^ inch long and 2-3 lines broad, is added 
to this genus. A new genus, Bracebridgea, which includes a single 
species, is remarkable as forming a link between Valonia and 
Siphonocladia , whilst resembling Codium tomentosum or Caulerpa 
papillosa in form, but having articulated filaments. The genus 
Anadyomene is increased by one new Australian species, A. circum- 
septa, distinguished by its nearly entire, subcorticate frond, with 
the veins arranged in a manner resembling that of the corticated 
species. To the genus Microdictyon two new species are added — 
M. obscurum from New Caledonia and M . crasium from the 
