3€0 Pvofensor Rupert Jones — Isochilince from N. America. 



of the phosphates on Ocean Island is no longer being deposited 

 there, but at what period it ceased is a matter of speculation, though 

 the present condition of the deposits suggests that a considerable 

 time must have elapsed. On many other islands in the dry central 

 parts of the Pacific, such as Rowland's, Jar vis', Baker's, and 

 Maiden's Islands, guano deposits occur and are still forming, as 

 Dana ^ and others ^ have described. 



By the courtesy of the Pacific Islands Company, Ltd., in furnishing 

 me with Dr. Voelcker's analyses of the phosphates of Ocean Island, 

 I am able to state that representative samples show an average of 

 86*57 phosphate of lime, 2*26 carbonate of lime, 0-21 oxide of iron, 

 and 0-31 alumina. 



A complete analysis by Dr. Voelcker of one sample of "hard 

 rock," exported as phosphate, is as follows : — 



Organic matter and combined water 1*30 



Phosphoric acid ... ... ... ... ... ... 39"63 



Lime 



Oxide of iron 



Alumina 



Magnesia, etc 



Carbonic acid 



Insoluble siliceous matter 



52-54 



-15 



-26 



4-60 



1-62 



-10 



(Sample dried at 100° C.) 



The coral - rocks and phosphates of Christmas Island, which 

 Dr. C. W. Andrews has kindly allowed me to examine, appear to be 

 of a difi'erent character to those from Ocean Island. Mr. J. Stanley 

 Gardiner, M.A., has kindly examined the two fragmentary corals in 

 the collection presented to us, and has identified them as belonging 

 to the genera Mceandrina, E. & H. (? subgen. Coeloria, E. & H.), and 

 Orbicella, which he states are both widely distributed in the Pacific 

 at the present day, and are among the most important of the reef- 

 builders. 



III. — On some IsocHiLiN^s fkom Canada and elsewhere in 

 North America. 



By Professor T. Eupert Jones, F.E.S., F.G.S. 



AMONG a large number of Canadian fossils sent to me by 

 Col. C. C. Grant, of Hamilton, Ontario, for transmission to 

 the British Museum (Natural History Branch), there were three 

 particular specimens of fossiliferous limestone worthy of careful 

 examination. These came from a glacial drift at Hamilton, known 

 as ' Bala Drift.' There being no real ' Bala ' strata in Canada, the 

 appellation of ' Bala Drift ' at Hamilton applies to a glacial drift 

 containing fossils more or less allied to those oi Bala, most probably 

 to the Trenton Limestone, a Lower Silurian (or Ordovician) 

 formation. 



1 Dana: " Corals and Coral Islands," 3rd ed., 1890, pp. 318-324. 

 ^ Hague: Amer. Journ. Sci., ser. ii, vol. xxxiv (1862), p. 224. Julien : ibid., 

 vol. si (1865), p. 367. 



