254 M. Miiller on the Development o/Chara. but this is not sufficient, it seems to me, to justify the association ; and the true place for the Cirrhipedes is, as a distinct class, be-tween the Myriapoda and the Annelides. The CampanularicB are not Acalephce, because that, in their embryo state, they have their characters and aspect ; nor are the Acalephce members of the order Anthozottj because the young Medusans resemble that order. Such facts indicate an affinity, but do not call for a coalition in one order. The Medusa are Anthozoans in their young age, and many Anthozoa are at first Medusans ; hence they necessarily belong to the same class, in which they constitute distinct orders. The Hydra are not Anthozoans, but rather freshwater Medusa, as I have along ago published. They cannot be separated from each other by any character of importance. The Tunicata, which more especially occupy our present at-tention, are very closely connected with the Bryozoa and the Ace-phala. I have thought it proper to leave them in the class Mol-lusca, because of the presence more especially of a heart. If they had not that organ, there would have been no more reason to place them amongst the Mollusca than amongst the polypes. In the branch or tribe of the AUo-cotyledones, the first class only, that of the mollusca, possesses a true heart. XXXIV. — On the Development of Chara. By C. Mullkr*. [With three Plates.] § 1. Introduction. Although this subject has occupied the attention of many ob-servers from an early period, and notwithstanding great light has been thrown upon it by these numerous investigations, still a history of its development combining the diffused observations has hitherto been wanting. My object has been to effect this, and its accomplishment appeared to me the more requisite, inas-much as this family, which is characterized by so many import-ant structural peculiarities above all other ciyptogamic families, nevertheless holds a doubtful position in systematic arrangement. Although from these investigations I do not venture to decide upon its systematic affinities, still, by describing the production of the spores to which so much importance is attached, I hope at least to adduce facts which may bring us nearer the truth. I would wiUingly have added the development of the anthers at the same time, on which numerous but not conclusive observations have been made; but as the time has arrived at which these * Translated from the Botanische Zeitung for June 12 and 19, 1845.
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