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ERRATA AND ADDENDA.

Page 198, 16th line from top, for "Martin" read Marten.

"bottom, for "who" read which.

for "L. opacina" read L. apacina.

top, for "Assidium " read Ascidium. bottom, for "Bonechere" read Bonnechere. top, for "Anodouta" read Anodonta.

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213, 18th

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for "Mare" read Marl.

bottom, for "scutotum" scutatum.
top, for "corumarius" read communis.

for "St. Clair" read Ste. Anne.

Page 242.-The starfish referred to in the first sentence on this page is Asteracanthion polaris (Müller).

In Articles VI. and XVIII., "Marcouin" frequently occurs for Mar souin; "Ste. Ann" for Ste. Anne; and "Glande" or "Grande" for Glaude.

are not so great as to neutralize the above resemblances in characters so essential to the formation of a natural system. That profound observer Jussieu, also, at an earlier date, did not fail to allow their due weight to these decided marks of propinquity.

Of the species of CRUCIFERE to be found in North America, Torrey and Gray describe 113. Of these, there are probably ten that have been introduced, and perhaps nearly as many are common or indigenous to both North America and Europe. The nine or more tribes into which these cruciferæ are divided, derive their characters from the length or shortness of the silique, its dehiscence or indehiscence, the arrangement of the seeds with regard to the CANADIAN NAT.

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VOL. IV. NO. I.

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ARTICLE I.—Remarks on the Geographical Distribution of the Crucifere throughout the British Possessions in North America. By GEORGE BARNSTON, Esq.

(Presented to the Montreal Natural History Society.)

In bringing CRUCIFERE forward immediately after FUMARIACEE, Torrey, with his usual acumen, has followed the surest indications of relationship. In these two orders the petals and stamens are equal in number, and the superior ovary is formed nearly on the same plan with Parietal Placenta. In both the sepals are deciduous, and those of Fumariace we might almost look upon as four, but united into two. The differences which do exist are not so great as to neutralize the above resemblances in characters so essential to the formation of a natural system. That profound observer Jussieu, also, at an earlier date, did not fail to allow their due weight to these decided marks of propinquity.

Of the species of CRUCIFERE to be found in North America, Torrey and Gray describe 113. Of these, there are probably ten that have been introduced, and perhaps nearly as many are common or indigenous to both North America and Europe. The nine or more tribes into which these cruciferæ are divided, derive their characters from the length or shortness of the silique, its dehiscence or indehiscence, the arrangement of the seeds with regard to the

CANADIAN NAT.

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VOL. IV. NO. I.

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