. Natural science: a monthly review of scientific progress. the linedividing the outer anterior sac from the inner posterior sac. 10 The figure of the visceral nerves given by Keferstein corresponds more towhat I have found than does that of Owen. 4H NATURAL SCIENCE. June, 1895. relation to the posterior branchiae that the osphradia of Lankester andBourne have to the anterior branchiae. Their greater proximity tothe middle line is shared in common with the posterior renal sacsand renal apertures, and even the posterior branchial veins, as com-pared with the corresponding anterior structures. T
. Natural science: a monthly review of scientific progress. the linedividing the outer anterior sac from the inner posterior sac. 10 The figure of the visceral nerves given by Keferstein corresponds more towhat I have found than does that of Owen. 4H NATURAL SCIENCE. June, 1895. relation to the posterior branchiae that the osphradia of Lankester andBourne have to the anterior branchiae. Their greater proximity tothe middle line is shared in common with the posterior renal sacsand renal apertures, and even the posterior branchial veins, as com-pared with the corresponding anterior structures. That they are bifid and, therefore, more highly developed than theanterior osphradia,11 is in keeping with their position in the livingNautilus in the anterior region of the mantle cavity, and also withthe fact that the posterior branchiae, with which they would beassociated in the metameric system, are considerably larger than theanterior branchiae. I remain, dear Professor Lankester,Ralum, New Britain, Yours very truly, February 10, 1895. Arthur 11 It must be remembered that the terms anterior and posterior as used aboverefer to the reflected position of the mantle and not to the actual position in theliving animal. SOME NEW BOOKS. The Text-book Writer among the Echinoderms. Lehrbuch der Vergleichenden Anatomie . . Vierte Anatomie der Echinodermen und Enteropneusten. By Lang. 8vo. Pp. xvi., 871-1198, 251 text figures. Jena: G. Fischer,1894. Price, 7 marks. As a condensed account of the morphology of the Echinoderma, thisshould prove a useful compilation, and one cannot but admire theassiduity of the compiler. But it is a compilation and little has not to read many paragraphs before becoming aware that thewriter is no specialist in this subject. From one point of view, thismay be thought an advantage ; from another it is certainly a dis-advantage. The author of a text-book such as this should combinethe learning of the specia
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