BIBLIOGRAPHY. 
123 
South America. Excellent tables of the distribution of the 
species, so far as is known, are given, and indicate, as does indeed 
the whole of the paper, that the author has spared neither time 
nor labour in working out his subject. His investigations point to 
the conclusion that the distribution .of the family as a whole is 
much influenced by the temperature of the water, and to a certain 
degree by its salinity, but that some species are much more 
tolerant than others in these respects. 
His discussion of this subject forms very interesting and in- 
structive reading. 
E. M. H. 
Analecta Algologica , Observationes de speciebus algarum minus 
cognitis earuvique dispositione , cum tab. n. ; Continuatio I. 
J. G. Agardh, Lund, 1894, Ex. Actis Soc. Physiograph. 
Lund, tom. xxix. 
As in the previous part, many new species are described, and 
their examination under the microscope has led in some cases to 
the rearrangement of the species or to new views concerning their 
affinities. 
In the Dictyotacece , the discovery of species possessing organs 
present also in the Cutleriacece has led Dr. Agardh to the con- 
clusion that the characters supposed by modern algologists to 
distinguish the Dictyotacece from the Cutleriacece can no longer be 
maintained as distinctive, and that further observations will pro- 
bably show that the two families form a natural and connected 
series. 
He now divides the Dictyotacece into four sub-orders, viz., 
Zonariece, Padinece, Spatoglossece , and Dictyotece . In the Zonariece 
three new genera are described — (1) Gymnosorus, to receive 
Zonaria variegata , Mert., Z. collaris, C. Ag., and Z. nigrescens , 
Sond. (2) Ilomceostrichus, to include Z. multifida, J.Ag., Z. 
Sinclairii, Hook, et Harv., and Z. stuposa , R. Br. (3) Chlani- 
dophora * comprising only Z. microphylla , Harv. These new 
genera depend chiefly on the mono or pleio-stromatic character of 
the frond and the position of the cortical cells relatively to those 
beneath them. 
Under the Padinece two new genera are described, viz., (1) 
Microzonia , to which Z. velutina, Harv., is referred, and (2) 
Lolophora , of which only one species, L. nigrescens, is known. It 
approaches Zonaria in structure, but Padina and Taonia in fructi- 
fication. The genus Stypopodium of Kiitzing, also included in 
the Padinece , is now reduced so as to include only the forms 
near to Zonaria lobata, in which the fructification more resembles 
that of Taonia and Padina than that of Zonaria. One new 
species is added to the genus Taonia , viz., T. australasica. 
* Written Ghlanidote on p. 6, apparently by a lapsus calami . 
