86 Transactions of the Boyal Society of South Africa. 
irregular growth, more or less pyriform anteriorly where the valves 
would be situated, of nearly equal width during two-thirds of their 
length, but rapidly narrowing the remaining distance so that the 
weathered surface of one of the blocks is seen to be crowded with 
the small posterior ends of these tubes. A fairly thick fibrous wall 
mostly characterises the tubes, the channel itself being frequently 
occupied with a light-coloured matriciform material. On one of the 
external weathered surfaces a natural section through the anterior 
end of a pair of valves is observable, showing a circular outline 
with an infilling of calcite measuring 4 mm. in diameter, with 
an obscure indication of the incurved umbones ; this appears to be 
the only reliable evidence of actual shell-structure, mineralisation 
and other causes probably accounting for its absence. 
Baily {Quart. Journ. Geol. Soc, 1855, vol. xi., p. 462) refers to the 
occurrence of Teredina-tuhes in the Cretaceous deposits of the 
Umzambani River district, South-East Africa, " with indistinct traces of 
the valves," as well as a group of smaller tubes strongly resembling 
Teredo antenautce of the London clay," from the same locality, 
which he thought might be the younger condition of the previously 
mentioned Teredina. Mr. Henry Woods has quite recently reviewed 
Baily's specimens [Annals South African Museum, 1906, vol. 4, 
part 7, pi. 37, fig. 8, p. 309), and has decided to regard this so- 
called Teredina as a Teredo because the evidence was not complete 
as to whether the tubes were soldered to the valves or not, the 
absence of accessory dorsal plates being also remarked upon. Mr. 
Wood's figure of a left valve from Pondoland drawn from a speci- 
men in the South African Museum, does not assist in the identifica- 
tion of the present remains. 
Griesbach also mentions the occurrence of Teredo in the plant- 
beds of the " Izinhluzabalungu " deposits of South-East Africa (Quart. 
Journ. Geol. Soc, 1871, vol. 27, p. 68), whilst similar tubes have 
been figured and referred to by Mr. Etheridge, jun., as having been 
collected by Mr. Anderson in the Umsinene River deposits of 
Zululand (Anderson, Third Report Geol. Surv. Natal and Zululand, 
1907, pi. 5, fig. 13, p. 83). More material is, however, required 
before it could be distinctly stated that Mr. Anderson's present 
specimens from the Manuan Creek rocks are related to such forms 
as have already been reported from this south-eastern area of Africa. 
Our form appears also to be somewhat closely related to species 
described by Stoliczka from the Utatur beds of Southern India. 
Locality. — Tributaries of the Manuan Creek. 
