Existence of Cmiibrian Fauna in Victoria. 57 



similar number of coalesced segments, with a flattened limb 

 produced into five or six short somewhat posteriorly-directed 

 spines on each side. 



This description, although imperfect in many respects, must 

 sufiice for the present, as it embodies all that can be gleaned 

 from the specimens. For instance, we know nothing of the 

 thorax, whilst the form of the free cheeks and condition of 

 the genal angles, spined or not spined, is doubtful. The all- 

 important points to be noted, however, are the facial sutures, 

 simply convex before and behind the eyes, the peculiarly squarish- 

 oblong outline of the glabella, triangular fixed cheeks, and the 

 very straight run of the axial grooves, together with the entire 

 absence of glabella grooves. These characters are supplemented 

 by the presence of the anterior and posterior distinctly 

 circumscribed lobes. The eye-lobes are certainly small and 

 non-olenelloid in appearance. Associated with these glabella? are 

 pygidiums possessing few segments, and a fimbriated margin. 

 The presence of a pleural groove is questionable. 



The two pygidiums figured (PI. I., Figs. 5 and 6) difier slightly 

 in outline, the smaller being sharper at the anterior lateral angles, 

 and more generally triangular in shape ; this last point, however, 

 may be only a matter of preservation. Furthermore, there are 

 in one (PI. I., Fig. 5) fiv^e lateral spines extending from the limb, 

 and in the other (PI. I., Fig. 6) six suniliar appendages. Possibly 

 the two may represent distinct species, but at this early stage of 

 the enquiry it is impossible to arrive at a satisfactory conclusion. 



The above points are those it will be necessary to use in 

 comparing the Heathcote fossils with probable allies, or genera to 

 to which they might possibly be referable. The genera it is my 

 intention to bring into comparison witli the fossils, irrespective of 

 horizon within the Cambrian system, are : Plychoparia, Corda ; 

 LiosiracHS, Angelin; Soienop/eura, Angelin; Bathyurus, Billings; 

 Z/(9)'^/^, Vogdes ; Oienoides, Meek; Protypus, Walcott; Avalofiia, 

 Walcott ; and Dorypyge, Dames. 



Altliough the form of the glabella in some apparently aberrant 

 forms of rtychoparia is similar to that in Dinesus., the pro- 

 nounced strength of the glabella furrows, and the direction 

 of the facial suture in the type species, P. striatus, Emmrich, 



