550 Bibliograpliical Notices. 



of the Christmas Island specimen ; in one point tliey certainly 

 differ, for all the polyps observed are on the dorsal surface of 

 the carapace, mostly between or near the antero-lateral teeth. 

 The few remaining limbs show portions of hydrorhiza in the 

 same positions as described above, but no polyps. 



In addition to the hydroid the Christmas Island specimen 

 of the crab carried a number of individuals of a very minute 

 solitary entoproctous Bryozoan probably belonging to the 

 genus Loxosoma, Many of these were attached to or in 

 the near neighbourhood of the hydrorhiza, but they showed 

 no tendency to a symmetrical arrangement on the two sides 

 of the crab. 



BIBLIOGRAPHICAL NOTICES. 



Atlas of Zooqeography. Prepared by J. G. Bartholomew, LL.D., 

 r.R.S.E., W. Eagle Claekb, F.B.S.E., F.L.S., and Pekcy H. 

 Geimshaw, F.R.S.E., F.E.S. Bartholomew & Co. : Edinburgh 

 Geographical Institute, 1911. 



"The object," we are told, " of the present volume is to delineate 

 and describe, so far as the state of our knowledge permits, the 

 present distribution of the higher animals over the surface of the 



Earth, This undertaking is entirely the result of original 



researches into the zoological literature of all countries. All the 

 families of Mammals, Birds, Reptiles, and Amphibians, together with 

 several of the more important genera and species, have been dealt 

 with, while the work embraces in addition most of the families of 

 Fishes and a selection of families and genera of Molluscs and 

 Insects." 



The authors in undertaking this work set themselves a formid- 

 able task, which they have achieved with conspicuous success, 

 providing a work of reference which will be of the highest value 

 both as a repository of our knowledge to-day and as a basis for 

 further research. 



In the case of a work which gives evidence of so much study and 

 care in the preparation it seems ungracious to suggest that it is in 

 any sense defective. Yet we cannot help regretting the omission 

 of the late Dr, Bowdler Sharpe's map of the zoogeographical regions, 

 for he was an authority of great weight on this subject, and his 

 map founded on the distribution of birds contained much valuable 

 and suggestive material. Happily the maps of Eussel Wallace, 

 Sclater, Heilprin, and Lydekker are given, and the marine areas of 

 Ortraann and Sclater respectively. 



The text has been condensed within an amazingly small compass 

 (we cannot help thinking unnecessarily so), and we hope that if a 

 further edition is called for this will be remedied. Another dozen 

 pages or so would surely not add greatly to the cost of a book 

 already expensive, and it would materially increase its usefulness. 



