Reviews — Harris and Burroivs — Paris Basin Mollusca. 555 



mollusca are always missed if this be neglected. Two wire sieves, 

 one sixteen meshes and the other eight meshes to the linear inch, 

 are suitable. A hammer is not often required ; a pointed trowel, 

 with a blade 5 in. or 6 in. long, is exceedingly useful for taking 

 up the loose material. Some chip boxes, to h(ild the rarer or more 

 delicate species, should be provided. A written label, tied to the 

 ring of each bag, shows at a glance the locality and formation of 

 the contents. For the fossils of the Sables Inferieurs, some preserva- 

 tive, such as potassic silicate, is required ; or they may be brought 

 away wrapped in cotton-wool, and subsequently treated. But by 

 far the greater number of the fossils are in a magnificent state of 

 preservation, and are easily collected and carried without the least 

 risk of fracturing them." Thus equipped, and with Messrs. Harris 

 and Burrows for travelling companions, we visit more than eighty 

 localities, and have a really good time. Those who cannot arrange 

 to be " personally-conducted " by the authors, must spend " three 

 shillings nett," and have the benefit of their printed directions, with- 

 out which it will be next to impossible to make a successful tour to 

 the many widely-separated rural French districts. And here the 

 excellent Map, which accompanies this book, proves most useful. 



The last section (pp. 57-129) is occupied with a description of the 

 Palaeontology of the Eocene and Oligoceue Beds of the Paris Basin. 



The authors have received the assistance of Mr. Arthur Smith 

 Woodward with the Vertebrata (a careful list of which is given, 

 including Mammalia, 19 species; Aves, 12; Reptilia, 10 species; 

 Pisces, 33 species). The Arthropoda are credited with 5 genera; 

 the Echinoidea with 14 species ; the Brachiopoda with 20 species ; 

 the Bryozoa with 4 species; the Actinozoa with 11 species; the 

 Foraminifera are too numerous to catalogue. The Plantse are briefly 

 referred to. References are given to authors for the several groups ; 

 so that the student may go to the original works in every case. 



The Mollusca occupy from pp. 63-124. Tables are given of all 

 the species, arranged with columns showing the range of each from 

 the Lowest Eocene ; the Lower Eocene ; the Middle and Upper 

 Eocene. The Oligocene Mollusca form a separate table. These 

 Tables of Genera and Species, which occupy 48 pages of the work, 

 produce the following summary. 



For the Eocene Beds of the Paris Basin : — 



Pelecypoda or Lamellibranchiata (including additional species 



on page 114 supplied by Cossmann) 1083 



Olisfocene Lamellibranchiata 112 



1195 



Eocene Gasteropoda (including additional species supplied by 



Cossmann, pp. 114-115) 2062 



Oligocene Gasteropoda ,. ... 177 



Gasteropoda Pulmonata 70 



Eocene and Oligocene Scaphopoda 32 



Eocene Cephalopoda 19 



2309 

 32 

 19 

 Total 3555 



