136 Reviews—The Progress of Paleontology. 
families of Cretaceous bivalves, are most excellent, and their processing 
and printing by the London Stereoscopic Co. most praiseworthy. 
4. Mr. F. R. Cowper Reed contributes a third part of his monograph 
upon Girvan Trilobites (Lower Palaeozoic) from Mrs. Gray’s collection. 
This collection of fossils, from the Ordovician and Silurian rocks of 
Girvan, Ayrshire, has already engaged the attention of the late 
Dr. Thomas Davidson (who studied the Brachiopoda), of Professor 
Lapworth, Professor H. A. Nicholson, Mr. Etheridge, and several 
other well-known paleontologists, and is now occupying Mr. Reed’s 
attention in describing the Trilobites. It will be remembered that on 
February 20th, 1903, the Council of the Geological Society awarded 
the balance of the Murchison Fund to Mrs. Gray in recognition of her 
labours during very many years in carefully collecting the fossil 
remains of this district, thus giving to her collection the mark of the 
Society’s approval and commendation. The careful gathering together 
of the fossils from a given horizon and locality cannot fail to be of 
the very greatest value to paleontological science. Seven plates, 
comprising figures of the genera Lichas, Acidaspis, Hncrinurus, 
Cybele, Dindymene, Calymene, Cheirurus, Phacops, Asaphus, Cyclopyge, 
Ampyxz, and IJilenus, well executed by Miss G. M. Woodward, 
illustrate the subject of the present memoir. 
5. Mr. Philip Lake commences a monograph of the British Cambrian 
Trilobites in this volume, which will carry on the work so long left 
unfinished by the late J. W. Salter. This will be of great importance 
to collectors and geologists, as the Trilobites occupy so large a place in 
the fauna of the Paleozoic rocks, and are also extremely valuable in 
marking off the horizons of the older rocks. Two plates only of the 
genus Agnostus accompany the present part, but they are extremely 
good illustrations of process-reproduction. 
6. The sixth and final memoir is by Miss Gertrude L. Elles, Se.D., 
and Miss Ethel M. R. Wood, D.Sc. (now Mrs. Shakespear). These 
ladies, with the assistance of Professor Lapworth, have reached the 
fifth part of their monograph, and now deal with the species of the 
genus Climacograptus, illustrated by two plates and numerous text- 
figures. All workers at this difficult group, the specimens of which 
are often very obscurely to be seen upon the surfaces of black shale, 
will be most thankful to the authors for the great pains they have 
bestowed upon the delineation and description of these organisms, 
which, when accurately determined, prove of such value to the 
stratigraphical geologist in fixing the various horizons of the very 
complex series of older formations of which they are the unerring 
landmarks and guides. 
We commend the work carried on by the Paleontographical Society 
to the attention of all students of geology, feeling sure that its 
monographs need only to be known in order to secure new annual 
subscribers, the better to carry on successfully the important and most 
valuable work of illustrating and describing every British fossil, and 
thus to aid in the progress of Paleontology. We may add that 
Dr. Arthur Smith Woodward, F.R.S., the Secretary, will be happy 
to receive the name of new subscribers at any time. His address is 
Natural History Museum, Cromwell Road, London, 8.W. 
