Cretaceous Gastropoda, and Pelecypoda from Zululand. 89 
as Trigonarca ligeriensis, Trigonia cf. scabra, Exogyra conica, &c., 
now described from the same area, materially supports this view as 
to their true position in the Cretaceous series. 
The Manuan Creek fossils are the most numerously represented 
in Mr. Anderson's collection, there being twenty-nine species of 
Pelecypods and five Gastropods, many of which are referred to new 
forms, although the reverse state of things obtains in the Cephalopod 
group, Mr. Crick having found that the False Bay specimens were 
much more largely in evidence, whereas only a very few were 
collected in the Manuan Creek district. This paucity of Cephalopod 
remains in the Manuan Creek deposits has rendered some difficulties 
in estimating their true geological age, and it is interesting to 
quote Mr. Crick's remarks in connection therewith: "The fossils 
[referring to the Cephalopoda] from the Manuan Creek, being as a 
rule fragmentary and very imperfectly preserved, do not admit of 
the precise identification possible with the False Bay specimens ; 
they belong, however, to the same series of beds as the False Bay 
fossils, but most of them — i.e., those labelled ' South Branch 
of the Manuan Creek ' — most probably represent a somewhat higher 
horizon (possibly Senonian) than that indicated by those fossils, 
whilst the few specimens from the ' Middle Tributary of the Manuan 
Creek ' seem to show the existence there of either a lower portion of 
the beds which are exposed at False Bay or even a slightly lower 
horizon." 
So far as my examination of Mr. Anderson's fossils is concerned, 
I am not able to recognise the importance of the locality sub- 
divisions of the Manuan Creek district referred to as " Middle 
Tributary of the Manuan Creek," " South Branch of the Manuan 
Creek," or " Crossing Middle Tributary." A few of the specimens, 
it is true, bear these locality labels, but since they were collected I 
fear they have got somewhat mixed, and it is far safer now to regard 
the whole of the fossils from this particular series of deposits as 
from the " Tributaries of the Manuan Creek," a general locality 
given me by Mr. Anderson himself a short time before he left 
London for South Africa. 
The Manuan Creek fossiliferous rock is generally a hard, grey- 
brown calcareous sandstone, although occasionally it is a light 
reddish-brown matrix of a soft marly character. Both rocks, which 
sometimes seem to merge into each other, are in all probability parts 
of the same set of sedimentary beds, and would appear to be those 
referred to by Mr. Anderson in his description of the rocks of this 
area (see p. 9 of this work). 
* In W. Anderson's " Third and Final Keport of the Geological Survey of Natal 
and Zululand," 1907, p. 249. 
