8 



for the present', I would suggest that they may be classed, 

 provisionally, as Proterozoic (1). It is quite possible that 

 more than one series of rocks are included in the suggested 

 Adelaide series. 



If the crustacean remains, referred to in this paper, are 

 really, as I believe, Proterozoic in age, it would be of quite 

 extraordinary interest to secure a complete fossil specimen. 

 What appear to be casts of annelid burrows can be discerned 

 in the weathered outcrops of those remarkable "varve" rocks, 

 the Tapley Hill shales, near Adelaide, which occur several 

 hundreds of feet below the Reynella horizon. There is, there- 

 fore, convenient to Adelaide, a considerable thickn-ess of strata 

 containing traces of obscure organisms, and it is to be hoped 

 that patient search by local geological workers will soon be 

 rewarded by the discovery of some complete specimens. Such 

 a discovery would doubtless prove of priceless value to the 

 palaeontologist. 



DESCRIPTION OF PLATE II. 



Remains of small Crustacea from the Proterozoic (?) or Lower 

 Cambrian (.^), Adelaide Series, Reynella, near Adelaide. 



Fig. 1. Bilaterally symmetrical organism, probably Crusta- 

 cean, showing antellules, claws, spiral gill, parapodia ( ? ), etc. 



Fig. 2. Probably a small carapace. 



Fig. 3. Various small appendages, probably locomotary, but 

 (f) may be portion of a spiral gill. 



