1897] SOME NEW BOOKS 203 



idae for suborders and inoe for families. The alteration in this way 

 of an already uniform and established system of nomenclature seems 

 to us quite unjustifiable. 



In the classification of the Protozoa we notice a certain number of 

 new names, some of which are coined for the purposes of new classi- 

 fications, while others are older groups renamed. The Sporozoa are 

 divided into two subclasses (1) Amoebogeniae (nov.) with amoeboid 

 sporozoites, and containing the Myxosporidia, and (2) Ehabdogeniae 

 (nov.), with sporozoites of definite form, including the remainder of 

 the class. The Ehabdogeniae are further divided into the two orders, 

 Dolichocystida (nov.), comprising the Sarcosporidia, and Brachycystida 

 (nov.), which includes the remaining forms, namely, the Gregarinidae, 

 Cocciiliidae,Haemosporididae(2)/'^a?iw^W'm,etc.)and Gymnosporididae 

 (Hacmamocba and others). In the Ciliata Stein's four orders are 

 maintained. The Holotricha are divided into Gymnostomidae, cor- 

 responding to Butschli's Gymnostoma, and the Hymenostomidae 

 (nov.), corresponding to Butschli's Trichostoma Aspirotricha. The 

 Peritricha are divided into Scaiotrichidae (nov.), comprising Butschli's 

 Lienophorina and Spirochonina, and Dexiotrichidae (nov.) = Yorticel- 

 lina. In the former the adoral zone of cilia has a sinistral (Jl,ko.i6s) 

 twist, in the latter a dextral (Ae£io$). 



The work is illustrated throughout by excellent diagrammatic 

 figures, for the most part coloured, some even in as many as four 

 colours. None of the familiar " vieux cliches " which persistently 

 haunt one text-book after another, are permitted to intrude between 

 these covers, all the figures being either specially constructed diagrams 

 or else copied or modified from the original figures in the special 

 memoirs. In short, the whole book is characterised throughout to a 

 marked degree by one most precious quality, that of clearness and 

 lucidity both in description and illustration. In conclusion, we con- 

 gratulate Messrs Delage and Herouard most heartily on the first 

 results of their labours, and wish them all success in the great task 

 which they have before them. E. A. M. 



GONIATITES IN THE BRITISH MUSEUM 



Catalogue of the Fossil Cephalopoda in the British Museum (Natural 

 History). Part iii. Containing the Bactritidae and part of the suborder 

 Ammonoidea. By Arthur H. Foord and George Charles Crick. Pp. xxxiv., 303. 

 Published by order of the Trustees. London, 1897. Price, 12s. 6d. 



The first part of this Catalogue, published in 1888, and the second 

 published in 1891, dealt with the Nautiloidea and were written by 

 Dr Foord alone. - That gentleman's removal to Dublin made some 

 help imperative, and Mr Crick, the assistant in charge of the Cepha- 

 lopoda in the Geological Department of the British Museum, has 

 proved a worthy collaborator. The experience gained from previous 

 work, combined with this fortunate co-operation, has brought the 

 present volume, which treats of the older Ammonoidea, very near our 

 ideal of what such a museum-catalogue should be. Some of these 

 publications of the Natural History Museum have been important 

 contributions to knowledge, but have left us still in the dark as to the 

 precise extent or value of the Museum collections ; others have dis- 



