383 
Í 
type specimens of O. pritchardi, lent to me with great 
cordiality by Prof. W. Howchin 
} am quite unable to separate the above cephalons; I 
l believe them to represent one and the same spe cies. I do not 
| quite follow Mr. Walcott in his reference of ' ‘Dolichometopus 
tater”? to the genus Kedlichia. The fixed cheeks are so differ- 
ently shaped, the direction of the ocular ridges so dissimilar, 
that the courses of the facial sutures must have been a 
unlike those of the Indian genus. At the same time I a 
by no means satisfied by merely placing these partial depintar: 
in Ptychoparia 
n looking round for a similar structure to that I have 
here termed a *' "bridge," uniting the anterior end of the 
glabella to the limb border, the genera A lokistocare i: and 
A erocephalites (38) obtrude themselves: In the former, ‘‘a low 
rounded boss occurs in front of the glabella, that usually ex- 
nre across the frontal limb (area) on to the frontal rim so 
o interrupt the furrow delimiting the two''; the boss 
appears to be variable in development according to species. 
In the latter of the two foregoing genera this bridge i is referred 
to as ‘‘a knob-shaped elevation," but in a cephalon placed 
in this genus with reservation by Mr. Walcott, the = 
o Pie ian with the limb by a well-defined narrow media 
ridge 
Loc.—Curramulka (or Parara[?], Yorke Peninsula, 
South A uitratie (Tate 
Hor.—Parara Limes ne, Lower Cambrian (Tate); 
Upper Cambrian ( Howchin); Cambrian (Etheridge). 
PrvcHoPARIA(?) SUBSAGITTATUS, Tate. 
Pl, xxxix., figs. 4 and 5. 
Be ary "der in Tate; Trans. Roy. Soc. S. Austr., 
1892, p. 187, pl. ii 12. 
Ne I. HH EMEN I taser MORD io DR rne 
pt. 2, 
? be Lis XH AS  subsagittatus" has no con- 
: nection with the genus of that name. I have before me 
: Tate's two specimens and two athées lent to me by: Prof. 
Howchin. 
The r esemblance between Tate's examples of his “Ole 
ellus pritchardi” and “Microdiscus subsagittatus”’ is rem 
able. In neither of the two type specimens of the latter is 
the true outline of the cephalon shown, but the fixed cheeks 
are slightly more cornute that in ‘‘O. pritchardi, ” the ocular 
` ridges somewhat more ent What, however, is of more 
» de eon: Smithsonian Miscel. Polinit., 64, No. 3, 1916, 
G9 Walcott: Ibid, p. 174. 
