188 PROCEEDINGS OF SéCTion Cc. 
Hemisphere, but probahly in great part foliows from ditfer- 
ential rates of migration, and points to a northern or @ 
southern place of origin of the transgressing forms. In eom- 
paring thesystemsof thetwo hemispheres, the divergenciesare 
net usually serious; but when we come to consider the divi- - 
sions of the systems, the effects of the discordances become 
more marked, and the more detailed‘ the subdivisions the 
greater are the difficulties of correlation, so that its definite 
attainment seems ic be beyond us. The assertions that have 
been made of the existence of universal floras and faunas in 
the past, the occurrence of which would so greatly aid cur 
attempts at mere homotaxial correlation, dc not derive any 
support from the analyiical examination of any particular 
case, but spring from imperfect knowledge and hasty 
generalisation. And yet “to record the events which have 
occurred during the existence of the earth in the order im 
which they have taken place” demands, not the assertion 
of mere homotaxis, bu! the reference of strata to a definite 
piace in an absolute tixee-scale. 
LITERATURE. 
Blanford (W. T.), 1890.—‘ Anniversary Address.” Proc. Geoi. 
Soc., Londen. Rh 
Deane, (H.), 1896.—[The supposed cosmopolitan flozaj, © Presi- 
dent’s address.” Proc. Linn. Sec., New South Wates. 
Deanc (#.), 1897.—id., ib. 
Deane (H.), 1900.—" Observations on the teriary fora of Aus- 
tralia” [etc.]. Pt. 1. ib. ‘ 
Deane (H.), 1901.—id. Pt. 2. ib. ; 
? 1894.— On the Anatomy and Relationships of Le- 
» No. 5. : = 
eithensige (R., jun.), 1892.—id. Pt..2. -Echinodermata [eic.], 
ik. 
Ettingshausen (C. von), 1883.—Denk. K.-Ak. Wiss. Wien, Bd. 
47. Translated as “Contributiens to’ the tertiary flora. of 
Australia.” Mem. Geol. Surv. N.S. Wales; Palsontology, 
Oipes 
Gregory (J. W.), 1890.—"' Some additions to the Australian ter~ 
tiary Echinoidea.” ' Geol. Mag., pp. 481-492. i 
Gregory (J. W.), 1895.—“ Contributions to the paleontology ang 
hysical geology ef the West Indies.” Quart: Jour. Geol. 
oc., v. 61. bie 
Gregory (J. W.), 1899.—“ On Lindstromaster and the classifica- 
tion of the Paleasterids.” Geol. Mag., pp. 344-354. 
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