Reviews — 2Vie Palcwntographical Society. 227 



A comparison of this memoir with the present monograph, as 

 summarized in Table A, pp. 516-25, and Table B, p. 526, of this 

 part, affords a striking index of tlie advance in our ktiowledge of the 

 Graptoloidea during the thirty-three years interval which separates 

 these works. In the earlier memoir the s])ecies and varieties 

 numbered 284, distributed over some 20 Graptolite zones ; the zones 

 are now increased to 36, and the species have risen to 372. 



All praise is due to the two lady authors, who, under the editorial 

 criticism of Professor Lapworth, have so ably carried on the task of 

 preparing this excellent monograph, now nearly completed. 



2. Under the title of "British Palaeozoic Asterozoa", Mr. W. K. 

 Spencer, a new author, commences part i of a new work, and by 

 way of introduction gives us a charmingly illustrated description 

 of the minute anatomy of the hard parts of these interesting ancient 

 star-fishes and their modern allies, one plate and thirty-one text- 

 figures being used to render his explanations and nomenclature of 

 parts clear to the reader. A bibliography of eighty-three works, 

 relating to the literature of the subject, is also given. 



3. Mr. F. E,. Cowper Heed adds a supplement to his monograph of 

 1906 on "The Lower Palaeozoic Trilobites of Girvan, Ayrshire ", in 

 order to describe twenty-three new species and three new varieties, 

 obtained by Mrs. Gray, of Edinburgh, and to make sundry emendations 

 and additions to his work. Eight excellent plates are also given of 

 these new forms. 



4. Mr. F. W. Harmer, a second new author, contributes part i of 

 a monograph on Pliocene Mollusca (being by way of a supplementary 

 monograph to S. V. Wood's Crag Mollusca commenced in 1847). 

 Mr. Harmer, together with other workers, have added between six 

 and seven hundred species to the Crag fauna of AValton (but 

 chiefly from Little Oakley), from which, in Wood's time, less 

 than 150 species were known. Mr. Harmer's contribution to this 

 volume occupies 200 pages, and the illustrations fill twenty-four 

 collotype plates, which being photographed from tlie actual specimens 

 gives them a trustworthiness and reliability which tlie student of 

 species will greatly appreciate. After an introductory section on the 

 localities and the recent literature we come to the description of the 

 Terrestrial Mollusca (twenty-four) and a number of freshwater forms 

 (twenty-four), also from the Crag deposits. Following upon these 

 we have the Marine Mollusca of the Crag, commencing with the 

 Gasteropoda (pp. 49-200). But we must revert to Mr. Harmer's 

 admirable monograph later, as our space is limited. 



5 and 6. These consist of the closing pages on the Ganoid Fishes of 

 the British Carboniferous Formations (with the title-pages nnd indexes) 

 and the fishes of the Old Bed Sandstone— closing the labours of our 

 old friend and fellow-contributor. Dr. E. H. Traquair, F.B.S. 



The indices to these volumes have been most carefully and kindly 

 contributed by our able Secretary, Dr. Arthur Smith Woodward, 

 F.ll.S., whose valuable services in the production of this hirge and 

 handsome volume all palaeontologists Avill most gladly and gratefully 

 acknowledge. 



