Bibliographical Notices. 129 to his conclusions ; and perhaps has been too much inclined to form a low estimate of the characters of the Eolidina*, thus making them correspond more nearly with their new allies. Some of the statements that we have now attempted to controvert are of this nature j and M. de Quatrefages is also inclined to disallow the existence of a heart and blood-vessels in Zephyrina, in which we suspect he is equally mistaken. BIBLIOGRAPHICAL NOTICES. Annales des Sciences Naturelles. February 1844. — Zoology. — Considerations on some principles re-lating to the natural classification of animals, and especially on the methodical arrangement of the Mammalia, by M. Milne Edwards. A very important and highly philosophical essay, embodying the di-stinguished author's ideas on zoological classification, the publication of which has been suggested by the paper of Mr. Waterhouse in the 79th Number of the ' Annals of Natural History.' — On some fossil Fish-teeth found in the neighbourhood of Staoulli, in the province of Algeria, by M. Valenciennes. The formation in which these teeth were found is tertiary (miocene ?) : they belong to three species of Sargus, a Chrysophrys and an Oxyrhina, and are all extinct forms. — On the Trypanosoma sanguinis, a new species of Hamatozoon, by M. Gruby f. This supposed animal (on the individual nature of which a doubt is thrown by M. Milne Edwards) was found circulating in the blood of frogs in spring and summer. Its body is long, flattened, transparent and twisted. The cephalic extremity is terminated by slender elongated filaments, and its caudal end terminates also in pointed filaments. It moves rapidly in a screw-like fashion. — A translation of Mr. Harry Goodsir's important paper on the Reproduc-tion of Cirripeda. — A translation of an abstract of Dr. Carpenter's paper on the Microscopic Structure of Shells. — Researches on Osteo-genesis, by Dr. Lebert. Botany. — Continuation of the monograph of the Nidularice, by MM. L. and C. Tulasne (with admirable plates). — Observations on the genus Aponogeton, and on its natural affinities, by M. E. E. Planchon. The author proposes to place Aponogeton either among the Alismacea, as the type of a suborder intermediate between the Alismaceae proper and the Juncaginece, or to consider it as the type of a new family of Aponogetacete, characterized by the absence of a perianth, by the ovaries being distinct and definite in number, by its few anatropous ovules attached to the base of the cell, and above all * We use this word here, as employed by Mr. MacGillivray, to designate the subfamily of which Eolis is the type. Eolidina had previously been employed in this enlarged sense, of which fact M. de Quatrefages does not appear to be aware. f See Annals, vol. xiii. p. 158. Ann. $ Mag. N. Hist. Vol xiv. K
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