GENERAL REVIEWS. 31 



put forward by different workers, since the previous edition. The wealth of illus- 

 trations, the many diagrammatic figures, the useful Bibliography, and the index to 

 the species of molluscs treated of, in addition to the general index, all tend to make 

 this work a valuable aid in the laboratory. 



The forcible objection, raised by Prof E. Ray Lankester, against this work in 

 1895 (cf Nature, 1895, p. 289) still holds good. It is unfair, in our opinion, to 

 use the observations of other workers without acknowledgment. The size of the 

 work need not be necessarily enlarged to admit of this, for a very little extra space 

 only would be necessary, and this might very easily have been obtained by omitting 

 such figures as 89 and 90 (p. 82, shell of Triton, from Parker and Haswell), and 

 the, often needless, repetition of other figures. 



This work has enjoyed a good reputation in the past, and the present edition 

 can only enhance the same. — W. E. C. 



Text-book of the Embryology of Invertebrates. By Dr. e. Korscheit 



and Dr. K. Heider. Translated by Matilda Barnard. Revised and edited by 

 Martin F. Woodward. Vol. iv, pp. xi + S94. London: 1900. Swan 

 Sonnenschein and Co., Ltd. 



The volume before us forms the final part of Prof. Korscheit and Heider's well 

 known and valuable " Lehrbuch." It is now over seven years since the original 

 work appeared and much has been added to our knowledge of the development of 

 the Mollusca, Tunicata, and Cephalocorda, of which phyla the present volume 

 treats. The task of revising and re-editing such a work is no easy one, and we 

 think Mr. Woodward would have been well advised if he had attempted to re-write 

 it. Almost all that could be done to amplify and bring up to date the section on 

 the Mollusca, by foot-notes, fresh paragraphs, and certain alterations in the text, 

 has been done; and although these are very often far too brief, and sometimes lack 

 clearness, they certainly tend to make the work a valuable resume of our knowledge 

 upon the embryology of the Mollusca, and one which every student will find of 

 great assistance. 



The Tunicata and Cephalocorda have not been so carefully revised as the 

 Mollusca. 



The work will prove of great service to senior students, and those who desire a 

 concise and systematic account of moUuscan embryology. — W. E. C. 



Text Book of Vertebrate Zoology. By j. s. ivingsley. pp. viii-f439. 



London: 1900. George Bell and Sons. 



Professor Kingsley's work is intended to supplement lectures and laboratory 

 work, and to place in concise form the more important facts and generalisations 

 concerning vertebrate animals. 



The work is divided into two parts, the first treating of the morphology of verte- 

 brates, based upon embryology, whilst the second presents an outline classification, 

 a subject which, the author thinks, " has been too much ignored in College work." 

 Part one is carefully written and should prove very useful to certain classes of 

 students, although there are some points which require re-writing, e.g. no useful 

 purpose can be served by referring to the remains of the pronephric duct in the male 

 Ichthyopsidian, as the "hydatid of Morgnani," or by using the term "Wolffian 

 (Leydig's) duct " for the mesonephric duct. Throughout the terminology requires 

 revision. 



The illustrations, of which many are new, are all excellent. — W^, E. C. 



