278 Revieios — O. F. Harris's Tertiary Mollusca — 



6. Diplograptus folitim, His. 



7. Diplograptus acuminatus, Nich. 



8. DipJograptiis cometa, Gein. 



9. Diplograptus tamariscus, Nich. 



10. Diplograptus hellulus, Tornq. 



11. Diplograptus cijperoides, sp. nov. (These two last species 



have no septum at all.) 



12. Diplograptus longissimus, Kurck. 



Heteroprionid^. 



13. Dimorphograptus of. Swanstoni, Lapw, 



This form differs from the true Swanstoni in having a longer 

 sicula, and in the fact that the monoprionidian portion is curved and 

 the diprionidian portion straight, while in Lapworth's species the 

 whole rhabdosoma is curved. Tornquist suggests that if these 

 features prove constant the name Kurcki should be given to the 

 variety. G, L. E. 



II. — Catalogue of Tertiary Mollusca in the Department of 

 Geology, British Museum (Natural History) : Part I, The 

 Australasian Tertiary Mollusca. By George F. Harris, 

 F.G.S. 8vo ; pp. i-xxvi, 1-408, with eight plates. (London : 

 Printed by order of the Trustees. Dulau & Co., 37, Suho 

 Square, W. Price 10s.) 



THE Catalogue of the Cephalopodous Mollusca, by Dr. A. H. 

 Foord, commenced in 1888 (of which the third part,' by 

 Messrs. Foord & Crick, is just out), together with the Systematic 

 List of British Oligocene and Eocene Mollusca, hy Mr. E. Bulien 

 Newton, in 1891, were the only volumes published on the Fossil 

 Mollusca in the Geological Department until the present work 

 appeared. Mr. George F. Harris has made an excellent commence- 

 ment in Part I with the shells of Australasia, and we may hope in 

 a few years to see a series of similar Catalogues by him of all the 

 important groups of Fossil Mollusca issued by the Museum. 



Great difficulty must always exist in dealing with the fossil 

 mollusca by reason of the absence of the animal, the systematic worker 

 being compelled in consequence to rely on shell-characters alone, 

 and he must institute most careful comparisons with living forms, 

 as well as with the contemporary fossil ones from other localities. 



Mr. Harris has devoted much time to the study of both Recent 

 and Tertiary Shells, and in conjunction with Mr. H. W. Buri'ows, 

 he communicated a most valuable Memoir to the Geologists' 

 Association (April 3, 1891) on "The Eocene and Oligocene Beds 

 of the Paris Basin," which was printed and published as a separate 

 part of their Proceedings on September 23 of the same year 

 (pp. viii and 130), with a geological map and thirteen sections. 

 He also published in 1891 an admirable Table giving an 

 approximate correlation of the Tertiary Beds of Europe, accom- 

 panied by explanatory notes, as a supplement to Mr. R. B. Newton's 

 List of Oligocene and Eocene Mollusca above referred to. 



