Reviews — R. Fourtau — Egyptian Echinoderms. 477 



forms as the CorbuHdse, etc., that have secondarily become free but 

 retain the hinge characters of the group. 



In the Taxodonta, through Ctenodo7ita and Palaonilo arise the 

 Nuculidse and kindred forms; whilst through Actinodonta spring on 

 the one hand the Anthracosiidse and Unioiiidse, and on tlie other 

 Modiomorpha and a group to which the name Prelieterodonta is 

 applied. This last in turn gives off two branches, the one comprising 

 the Myophoridse and Trigoniidce, the other leading through Ilegalodon 

 to the Heterodonta. 



The Dysodonta have also two branches : firstly, Paloiarca and 

 the Arcidse ; and secondly, Pteriiieidi3e, giving off the Mytilidfe (with 

 Conocardimn and Lunulicardiuni) and the Aviculida? (i.e. Pteriidae), 

 Pectinidse, Ivimidse, and Ostreida3. 



Finally, the Desmodonta, beginning with the Solenofisidoe, pass up 

 through the Granimysiidfe to the forms usually included under 

 Myacea, Adesmacea, and xVnatinaeea. 



To what extent M. Douville's scheme will stand the test of close 

 investigation remains to be seen. Probably his interpretation of the 

 liinge characters may in certain cases have to be revised, but the 

 broad outlines seem well conceived, and his paper merits the careful 

 attention of all interested in the Mollusca. 



B. B. W. 



IV. — Catalogue des Invketebkes fossiles de l'Egypte representes 

 DANS LEs Collections du Musee be Geologie au, Caike. Par 

 R. FouRTATJ. Terrains Cretaces. Ire partie : Echinodermes. 

 4to ; pp. i-vii, 1-109, pis. i-viii. Cairo: Geological Survey of 

 Egypt, Palseontological Series, No. 2. 



IF the present rate of output is maintained the collections of the 

 Geological Museum at Cairo will soon rank among the most 

 completely and thoroughly catalogued material extant. The first 

 part of the Catalogue, dealing with the Eocene Echinoids, was 

 reviewed recently in these pages, and now the second part is 

 published. The style and production of this volume leave little field 

 for criticism. It is perhaps a littie confusing that, whereas the first 

 part had a title-page printed entirely in French, the present part has 

 all but the actual name of the work in English. 



The number of misprints seems to be remarkably small, a 

 gratifying feature in view of their serious frequency in the first part. 

 The plates are, if anything, clearer both in drawing and execution 

 than were the previous series, and their concentration at the end of 

 the volume renders them easier of access than did their insertion in 

 various parts of the text. 



Although Asteroids and Crinoids are mentioned in the work, there 

 is little fresh material recorded. A new genus, Spencena, is proposed 

 for Metopaster teilhardi, the name being given in recognition of the 

 work of Mr. W. K. Spencer on Cretaceous Asteroids. The bulk of 

 the volume is occupied by a descriptive catalogue of no fewer than 

 122 species and varieties of Echinoids, of which but a small 

 proportion are new. In common with many other workers on 



