229 
One of the chief points of interest with regard to this form is its relationship 
to other fossil types of the same genus. The species to which C. complanata 
bears most resemblance is C. acutidorsatum, Hantken, sp.* In this species, 
however, the whorls of the shell are involute, or embracing. Naumann 
and Neumayr have described a Cyclammina from the “Kalkstein” 
(? jurassic), of Japan;f and this seems to be the oldest recorded example ; it 
is stoutly built, with about eight segments in the outer whorl. The pliocene 
species described by De Amicis— Cyclammina plioccena% —is sub-elliptical rather 
than discoidal in outline, and has fewer segments. Our species bears a general 
likeness to the recent species, C. cancellata, Brady, but is more compressed, and 
the peripheral margin is correspondingly sharper. C. complanata is very 
abundant in Sample No. 1, Brown’s Creek, Victoria. 
Cyclammina paupera, sp. nov. 
Plate XXII., Fig. 6. 
Test discoidal, in the form of an involute spiral, much compressed at the 
periphery, umbilicus excavate ; segments irregular, often aberrant in form ; 
septal lines sinuous or anteriorly convex ; shell-surface smooth. Average 
diameter of test 1mm. Frequent in Sample 1, Brown’s Creek, Victoria. 
Age of the Deposits. —With regard to the distribution of Cyclammina in 
cainozoic fossiliferous beds in Europe, we note in particular the nearly allied 
C. acutidorsatum , which occurs in the Clavulina-szaboi beds of Hungary, equiva¬ 
lent to beds of upper eocene and oligocene elsewhere. 
The present species is also characteristic of the Spring Creek beds, near 
Geelong, and specimens in the National Museum, Melbourne, are of the 
exceptional size of 3mm. in diameter. Since this form also occurs at Spring 
Creek, in beds of Jan Jukian age, it is presumed that the clays of Brown’s 
Creek are on the same geological horizon. 
* Haplophragmium acutidorsatum, Hantken, 1875, Mitth. Jahrb. Kon. Ungar. Geol. Anstalt, 
vol. iv., pt. 1, p. 12, PI. I., Fig. 1. 
t Denksclir. A. K. Wien., vol. Ivii, p. 26, PL V., Fig. 7. 
J Naturalista Siciliano, 1895, vol. xiv., Nos. 4, 5, et seq., p. 12, PI. I., Fig. 19. 
PRESENTED 
2 0 JAM. 1905 
