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 



