42. 



H.-J.KUHN. 1971. DIE ENTWICKLUNG UND MORPHOLOGIE DES SCHADELS 



VON TACHYGLOSSUS ACULEATUS 



Habilitatlon-dlssertation, Frankfurt /M. 



W.Kramer, Frankfurt/M. Abh. Senckenberg. Naturforsch.Ges . 528. 



192 pp. , 43 figs. 



Very thorough study from a comparative-anatomical viewpoint, 

 based on skulls of one pouch young, two juvenile animals, one 

 subadult , and several adult animals; chondro-, endo-, and exo- 

 cranium; beautifully illustrated with half-tone and line 

 drawings of reconstructions and cross sections, 



43. 



A.C.G.WENINK. 1971. SOME DETAILS ON THE PINAL STAGES OF HEART 



SEPTATION IN THE HUMAN EMBRYO 



M.D. thesis, Leiden. 76 pp., 50 figs. French summary (3 pp.) 



Nine human embryos of 14-35 mm. CR length, one 27 rrnn. embryo 

 with a ventricular septal defect, and one neonatal heart; photo- 

 micrographs, graphical reconstructions of embryonic hearts, and 

 reconstruction of neonatal fibrous heart skeleton. 



Symposium reports 



44. 



A.A.DAHLBERG, 'ed . 1971. DENTAL MORPHOLOGY AND EVOLUTION 

 Univ. of Chicago Press, Chicago, etc. X,350 pp., 134 figs., 44 

 tabs., author and subject indexes. $ 18.50, £ 9.00 



This book embodies the papers presented at the Second Interna- 

 tional Symposium on Dental Morphology held in Englefleld Green, 

 England in September, 1968. Several papers have been expanded 

 for the book, and this may be one of the reasons for the time 

 lag in publication. 



We review the book here mainly because it contains five papers 

 on dental ontogeny. The first of these is a paper by Butler on 

 the growth of human tooth germs, presenting the latest views at 

 the time of writing, and demonstrating the relative independence 

 of growth and calcification. Papers by Kollar and Baird, and by 

 Miller discuss epithelial-mesenchymal Interactions in trans- 

 planted mouse tooth germs and recombinates . Tonge reports on new 

 histological findings concerning the role of mesenchyme in mam- 

 malian (mainly human) teeth. A brief paper by Stack considers 

 relative rates of weight gain in human teeth. 



In the other two sections of the book, entitled Phylogeny and 

 Morphology, problems of tooth ontogeny and pattern formation are 

 also repeatedly touched upon, notably in the papers by Hershko- 

 vitz on the evolution of crown patterns in mammals, by Kovacs on 

 the morphology of dental roots, and by Dahlberg on penetrance 

 and expressivity of dental traits. 



The book is very well produced and Illustrated. 



45. 



A.D.DIXON, ed. 1971. CONFERENCE ON GROWTH AND DEVELOPMENT 

 American Dental Association, Chicago. J. Dent. Res. Vol.50, 6, 

 suppl. I4l pp., 68 figs., 23 tabs. $ 5.00 (paper) 



This Conference was held at the Dental Research Center, Univer- 

 sity of North Carolina in January, 1971, and the present Journal 

 supplement contains the papers presented and the discussions 

 held during the Conference's two Symposia, as well as three con- 

 tributed papers and abstracts of another 23 contributed papers. 



