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BIBLIOGRAPHY. 
Kiitzing, in the omission of the genus Adenocystis (which the 
author has not been able to examine) and the unusual position 
given to Alaria. 
There are three tribes, viz., the Laminar iidece, Lessoniidece , the 
Alariidece, the first subdivided into the sub-tribes Laminariece and 
Agarece , the second into Lessoniece and Macrocystece , and the 
third into Ecklonieoe , Egregiece and Alariece. These contain the 
following genera respectively : — 
Laminarieae. — Chorda , Saccorhiza, Laminaria. 
Agarece. — Cymathcere , Costaria , Agarum , Thalassio phy Ilum 
Arthrothamnus. 
Lessonieje. — Dictyoneuron, Lessonia, Postelsia , Nereocystis. 
Eckloniece. — Ulopteryx , Ecklonia , Eisenia. 
Egregiece. — Egregia. 
AlariEcE. — Pterygophora , Alaria. 
The author gives as his reason for retaining Chorda in the 
Laminariaceoe that the paraphyses resemble those of Saccorhiza, 
although he admits that it bears hardly any other resemblance to 
the Laminar iidece, and practically acknowledges that Reinke has 
good grounds for placing it in a sub-family near the Scytosiphonece. 
Cymathcere forms the link between Laminaria and the Agarece., 
by the possession of longitudinal folds, which bring it near 
Costaria, and Arthrothamnus forms the link between the Agarece 
and the Lessoniidece by the unrolling of the base of the 
lamina as in Agarum and the tendency of the stem to fork as in 
Lessonia. Pelagophycus of Areschoug is sunk under Nereocystis, 
as the author considers there is not sufficient difference between 
them in the mode of fissure of the fronds at the region of active 
growth. 
In the Alariidece the sub-tribes are founded on the positions of 
the sporophylls, viz., (1) on the blade ; (2) on both blade and 
stem ; (3) or on the stem only. This seems to be scarcely a 
natural arrangement, since Ulopteryx, which has a midrib and 
cryptostomata, is thus placed with the ribless Ecklonia , and Alaria, 
which has also a midrib and cryptostomata, is placed with 
Pterygophora, which has neither. 
The author has had quite exceptional opportunities of examining 
the rarer speeies of the family, and therefore speaks with some 
authority, and his opinion must receive due consideration. It 
may be hoped, however, that he will be led by further researches 
to revise the Alariidece and devise a more natural mode of grouping 
them. The author’s remarks on the geographical distribution of 
the Laminariaceoe are extremely interesting, and show that there 
is need of further records concerning the distribution of the 
genera, more particularly of the forms met with on the Pacific 
Coast and in the direction of North and West Australia, the Cape 
of Good Hope, and in the direction of the Society Islands, etc., in 
the Middle Pacific Ocean, and also as to the distribution of the 
genera on the Western Coast of Africa and the Western Coast of 
