Bibliographical Notices. 107 value, for, as wo pointed out in our criticism of the first part, it is not altogether reliable as regards coinpleteuess. In tlie two parts before us we find numerous omissions ; indeed we do not Dotice any improvement in this respect. A number of the references are hopc-lessl)' contracted, so that it becomes a matter of guesswork which work may be referred to. As examples wc may cite " Grass. Ind. Test.," " ret. Moll. T.," " Mrts. lieitrg.," « Tapp. C. p. 287," "Mrts. Asia C. 83," " Dkr. Afric. M.," tic. . The same remarkable contrac-tions of authors' names appear in many instances. It will doubtless pu/./.le many conchologists to recognize the following writers : — Dub., Hilb., liudd., Lub., Watlb., Crras., Euth., Leo., Urgt., &c. We also notice in a few cases names given as authors' which are altogether incorrect, e. g. Yoldi and Valdiv., the former the name of the owner of a celebrated collection, the latter a contraction for Vuldivia, a place in Chile. Sometimes names are variously abbreviated : for example, De Morgan appears as de Mou., d'Morg., Morg., and d. Morg. ; Brazier is rendered Erac, liruz., and lirazier ; and Craven is written Crav., Craw., Crawen, and Craven. The localities are frecjuently as enigmatical as the authors' names. It would be a matter of some difficulty to recognize the position of such places as these : —Jalap., Mach., Hum. Hill., Solothr., Nag., I. Aitut., Toni B., Tillow., Uet. gia., Tuk. Eer., &c. In conclusion, we do not deny that the work possesses a certain usefulness ; but this is certainly marred in the points we have indicated. Foraminifera and liadiolaria from the Cretaceous of Manitoba. By JosEni B. TYKiuaL, M.A., B.Sc, &c., of the Geological Survey of Canada. (Trans. Hoy. Soc. of Canada, 18i)0.) Mr. Tterell gives a succinct account of the researches and surveys whereby the natural sections in Manitoba are known to expose the several groups of Cretaceous strata, with their estimated thicknesses, as follow : — feet. Laramie ? J Odanah 500 nerre | ;5jiy„.oyj 5qq Niobrara 200-540 Benton 130 Dakota 50-150 Besides visible sections of outcrops, the wells and deep borings have been utilized in obtaining a knowledge of the strata under-lying the wide plains of the Canadian North-West. By the careful comparison of the successive beds met with in these borings, and especially by a microscopic examination of their respective materials, they can be identified, and the sections can be correlated — their relative characters and thicknesses can be noted — and not
Foraminifera and radiolaria from the Cretaceous of Manitoba. By Joseph B. Tyrrell, M.A., B.Sc., &c., of the Geological Survey of Canada. (Trans. Roy. Soc. of Canada, 1890)
BioStor
