1899] Reviews. 115 



Wachsmuth and Springer's Monograph on Crinoids. 



In his delightful review* of Wachsmuth and Springer's 

 monograph on Crinoids " Prof F. A. Bather proposes that for 

 all crinoids, pinnulate or non-pinnulate, in connection with the 

 successive series of brachials, the following terms be used, urging 

 that all writers on crinoids should agree in this matter. They 

 are as follows : Primibrachs il Br.); Sccundibrachs (II Br.); 

 Tertibrachs (III Br.) ; Quartibrachs (IV Br.). It is to be hoped 

 that the above terms will be employed by future writers of 

 descriptions of crinoids. The concession made by Prof Bather 

 in this matter not only deserves commendation but tends to 

 establish uniformity in terminology. Pmf. Bather further dis- 

 cusses the morphological part of the Monograph, the quinque- 

 partite character of stems of the larger number of Lower Paleo- 

 zoic crinoidea, the cirri of PahEozoic crinoids, radials and 

 compound radials, basals and infra basals, the course of the 

 axial nerve cords in certain crinoids and the " Law of Wach- 

 smuth and Springer " as interpreted and proposed by Prof. 

 Bather, the fusion of basals as well as notes on the corms, ovals 

 and tubes. 



The last notice of Prof Bather deals with the System 

 Camerata to which is appended an obituary notice of Prof 

 Wachsmuth with the Bibliogiaphy of that writer. 

 GeOLOGICA BiRLIOfJRAPHIA. 



The Geological Survey of Belgium has recently issued a 

 scries of very important volumes entitled Bibliographia Geolo- 

 gica. These volumes are prepared according to the approved 

 decimal classification of Melvil Dewey and form part 549-559 of 

 the Bibliographia Universalis of Dr. G. Simoens. Michel 

 Mourlon of Brussells, director of the Geological Survey of 

 Belgium, has c\\?i\gQoii\\G Bibliographia Geologica and it is a work 

 of paramount importance to working geologists. The volumes 

 contain about 400 pages each and give some 6,000 titles of 

 publications in geology, palaeontology, mineralogy and pre- 

 historic a chfBology. These may be obtained, Mons. Mourlon 

 writes, from Hayez, 112, Louvain street, Bru.ssells, Belgium. 



*F. A. Lallii r, in Ceo!. Mag. New Scries, Dec. IV, Vol. V, I.onilon, Enf;., 

 1898. 



