Bibliographical Notice. 79 I must remark in conclusion that the very perfect specimen that I have just described probably represents a spike of fruc-tification which had not reached its last degree of development. Two facts seem to indicate this : 1, the microspores, in nearly all the sporangia which contain them, are immersed in the midst of a granular opaque matter, in which they show by transparency, and which has the appearance of the cellular plasma that surrounds these organs before their maturity ; and, 2, the vessels, which form very distinct bundles in the axis of the cone, only present transverse strias or scarcely dis-tinct rings, and not the strongly marked streaks of adult scalariform vessels. This want of maturity has perhaps been favourable to the integrity of these fossils ; but it is possible, and even probable, that the microspores and macrospores, when their development is complete, would present some differences which must not be regarded as arising from a really distinct organization. Some of the spores composing the triple microspore already appear disposed to become isolated, and would probably ac-quire the trigonal form indicated by J. Hooker for the spores of Lcjriclostrobus. Some of the macrospores also seem to pre-sent in their interior a more complex organization, which would indicate a tendency towards the form with a trigonal apex of the macrospores of Isoetes. Fresh specimens, even mere fragments, but at a different degree of development, will perhaps hereafter complete our knowledge of this subject ; but from this day forth the exist-ence of these gigantic Lycopodiacese, showing a still more complete relationship to certain existing forms of this family, is established indubitably. BIBLIOGRAPHICAL NOTICE. Observationes circa Pezizas Fenniae. Scripsit William Ntlander. Accedunt tabulae II. lithographicae. The above treatise has been called forth by the work of Karsten entitled ' Expositio Pe'zizarum sibi cognitarum Fenniae/ concerning which Prof. Nylander observes that the characters given are, for the most part, mere transcripts of those of Fries in the ' Systema Myco-logicum,' with the addition of some occasional and vague remarks on the fruit. The author considers M. Karsten to have neglected the means he had at his disposal of verifying the species he describes, in not consulting collections of published specimens, such as those of Mougeot, Desmaziere, and Rabenhorst, and states that he has him-self acquired a more accurate knowledge of the subject from study-ing the specimens contained in the Museum of the Society for the
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