Bibliographical Notices. 9-3 



readers who have been puzzled with the new names applied to parts 

 of animals, or used as the designations of phenomena in their lite- 

 history, will be glad to hear that a very great number of them 

 are intelligibly explained in Mr. Pascoe's glossary. In fact the 

 book as it stands may be heartily recommended to all who want 

 a useful, portable, and trustworthy compendium of systematic 

 zoology. 



.1 Monograph of the Silurian Fossils of the Girvan District in Ayr- 

 shire. BvH. A. Xicholsox, M.D., D.Sc, &c, and R. EtheriihtK, 

 Jun., E.G.S. Fasciculus II. 8vo. Pp. 137-234, plates 

 x.-xv. Edinburgh : Blackwood and Sons, 1880. 



The second fascicidus of the above work, although not so extensive 

 as the first part as regards the plates and letterpress, is equally 

 interesting. It is occupied wholly with the Crustacea from the 

 Silurian rocks of Girvan, and contains descriptions of the remaining 

 Trilobita, continued from the first part, as well as of the forms 

 referred to the Phyllopoda, Cirripedia, and Ostracoda, which groups, 

 however, will be further supplemented in the third part, in conse- 

 quence of additional material recently collected, embracing either 

 new species, or adding to the already available information as to 

 forms previously described. 



The descriptions include about 40 species of Trilobita, 4 rhyllo- 

 poda, 1 Cirripede, and 8 Ostracoda ; the notes on the latter group 

 have been furnished by Prof. T. ftupert Jones. 



This part contains a table showing tbe geographical distribution 

 (in twenty-three localities) of the species of Crustacea in the Girvan 

 district, and some general remarks on the stratigraphical relations 

 of the species as a whole, more especially in regard to the evidence 

 afforded by them of the age of the beds in which they occur ; and 

 these are referred to the Caradoc, Lower Llandovery, and Upper 

 Silurian formations. 



In comparing the range of corals and Crustacea it will be observed 

 there is an increase in the number of localities yielding Trilobites, 

 or other orders of Crustacea, over those from which corals have 

 been obtained. Whether this result will be maintained after addi- 

 tional researches remains to be seen. " It is, however, noteworthy 

 that at certain localities where the coral-fauna has been found 

 to be copious, the Crustacea are correspondingly scarce, and vice 

 versa." 



The Plates, with the exception of pi. xv., which is faint, are 

 well executed ; and the authors have spared no labour to render the 

 descriptions and references as exhaustive as possible, by the careful 

 comparison of original specimens, figures, and descriptions of pre- 

 viously described similar forms. 



