i8 9 6. "DAS TIERREICH. 307 



that its chief use will be as a book of reference, we should urge, if it 

 be not too late, the employment of a rather smaller type (say long 

 primer and brevier), so as to get more into a page, which everyone 

 knows is a great advantage in books of this nature. We should also 

 have thought that a paper of rather less weight, such as that used for 

 the Oxford Bibles or Liddell and Scott's Greek Lexicon, would have 

 had many advantages over the rather stout and heavy paper adopted. 



The work will appear in a series of Lieferungen, each dealing 

 with one or more closely connected groups. The sizes of the 

 Lieferungen will necessarily vary, but it is not intended that they 

 shall be less than three sheets. It is estimated that the Platyhel- 

 minthes will occupy 4 Lieferungen, the Crustacea 11, the Hymen- 

 optera 13, the Mollusca 15, the Reptilia 3, and the Aves 16. Each 

 Lieferung will be sold separately. Those who promise to subscribe 

 to all that are published during a period of five years will receive 

 them at a price of about 70 pfennige per sheet. The price of 

 separately sold parts will be calculated at one-third higher. Each 

 part will be printed and published as soon as ready, without any 

 relation to systematic order. Notwithstanding this, it is expected 

 that it will take twenty-five years to complete the work. It is 

 intended that the first part shall appear at the beginning of 1897, an( ^ 

 in case enough subscribers are obtained, there will be issued an 

 edition on writing paper, as well as one printed on only one side of 

 the page. Orders for the whole work or for separate parts should be 

 sent as soon as possible to the publishers, R. Friedlander & Sohn, 

 11, Carlstrasse, Berlin, N.W. 



As a specimen-part, we have received " Heliozoa bearbeitet von 

 Dr. Fritz Schaudinn," 24 pages, 1896. This begins with a systematic 

 table of contents. Then follows a list of the six abbreviations used in 

 this part for morphological terms ; these are : Ectpl. Ectoplasma, 

 Entpl. Entoplasma, Ncl. Nucleus, Pis. Vac. Pulsierende Vacuole, Psdp. 

 Pseudo podium, Vac. Vacuole. The abbreviations for references to 

 literature follow those given in the Zoological Record, and a list is given 

 of such works as are here referred to but not included in the Record. 

 The description of the division Heliozoa occupies nearly a page and a 

 half, or a page and two-thirds if one includes the drop at the head of 

 the first page, a feature that might well be dispensed with in a book 

 where space is so extraordinarily valuable. In this space are to be 

 found : first, authorities for the name Heliozoa ; secondly, a diagnosis 

 of six lines, hair-spaced ; thirdly, a further explanatory description of 

 twenty-one lines, just such as one might find in any text-book of 

 zoology ; fourthly, a description of the various diagnostic characters 

 used in delimiting the minor divisions, accompanied by ten small 

 figures of spicules, and occupying twenty-nine lines ; fifthly, a line of 

 small type devoted to geographical distribution ; sixthly, the numbers 

 of the orders, genera, and species, a statement that families are 

 impracticable, and the rejection of the Vampyrellidae from the group, 



z 2 



