708 
DR W. T. GORDON ON CAMBRIAN ORGANIC REMAINS 
A rch'seocyathinae. 
Archeeocyathus pauci.septatus, sp. nov. 
Thalamocyathus flexuosus, sp. nov. 
,, ichnusx, Meneghini, sp. 
,, infundibulum , Bornemann, sp. 
„ trachealis, Taylor, sp. 
,, tubavallum, Taylor, sp. 
Spirocyathus atlanticus, Billings, sp. 
Syringocnema gracilis, sp. nov. 
Coscinocyathus endutus, sp. nov. 
„ fultus, sp. nov. 
Protopharetra polymorpha, Bornemann. 
,, radiata, Bornemann. 
Metaldetes plicatus, sp. nov. 
Didyocyathus sp. 
The presence of algse in this limestone at once imposes certain limits to the 
depth at which the rock must have been formed, for these plants could not 
have lived in the complete absence of light. At the same time, the rock con- 
sists entirely of calcareous material without admixture of sand grains. The deposit, 
then, must have formed in shallow, clear water, possibly with little or no current 
action. 
In comparing the above list of organic remains with similar lists from other 
areas, it is natural to consider, in the first place, Antarctic localities. In the various 
reports of the British Antarctic Expedition, records of a Cambrian flora and fauna 
are given, but unfortunately the material obtained was not very perfect. Taylor’s 
report* states that two families of the Archseocyathinse were certainly present, 
namely, the Archseocyathidse and Spirocyathidse. Chapman t describes the alga 
Epiphyton fasciculatum from the same area, and, although the material seems 
badly preserved and consequently his figures rather defective, there is no doubt 
that one of the algse recorded above is identical with his species. Another fossil 
common to the two localities is the forked sponge spicule which Taylor has 
compared with Lelapia. Several of these forked forms have been noted in Weddell 
Sea material, and the evidence now available shows that the spicule was probably 
a hexactinellid type in which one ray is branched. So far, then, as the record from 
the Beardmore Glacier goes, it shows a wonderful similarity with the Weddell Sea 
record. These localities $ are approximately on opposite sides of the South Pole 
(text-fig. 2, X, X'), but in neither case has the material been obtained in situ . 
* British Antarctic Expedition, 1907-9, “ Geology,” vol. i, p. 240. 
f Ibid., vol. ii, pp. 81-83. 
t Bruce, Weddell Sea position, 62° 10' S., 4'>° 20' W., Scottish National Antarctic Expedition, 1902-4 ; Shackleton, 
Beardmore Glacier position, 83° 42' S., 171° 30' E., British Antarctic Expedition, 1907-9, “Geology,” vol. i, 
p. 235, 
