388 G. F. Matthew—The great Acadian Paradowides. 
The terminations of these enlargements are sharply serrate. 
The constituent fibers at times are slightly divergent and 
AN 
AW 
oe 
ee 
\\\ 
NY) i y 
_ ; ae 
nd 
iy 
Fig. 3.—a, a, a, porvion of an pueite core; 8, 3b, 3, hornblende enlargements ; 
CuChic; feldspar. 
usually cut deeply into the feldspar. Ordinarily the fine 
fibrous cleavage of the hornblende is coincident with the cleav- 
age of the augite. However, the angles c: ¢ in the augite and 
in the enveloping hornblende show their characteristic relations. 
In transverse sections (fig. 4) 
where the intersecting prismatic 
cleavages of the augite and horn- 
blende are seen, their relations are 
such as to indicate that the ortho- 
and clino-pinacoids in the two min- 
erals are parallel. 
The crystallographic relations of 
the two minerals are, then, in both 
longitudinal and transverse sec- 
tions, those well known to occur 
between augite and hornblende 
paramorphic after it. 
University of Wisconsin, Madison, Feb., 1887. 
Art. XLL— The great Acadian Paradoxides; by G. ¥. MaTTHEWw. 
In this Journal (vol. xxx, p. 73), the writer, in speaking 
of the occurrence of the great Welsh Paradoxides (P. Davidis) 
in the Cambrian rocks of Newfoundland, alluded to the fact 
that another gigantic species of this genus was present in the 
Cambrian basin at St. John. At the time when that com- 
munication was written, the St. John species was known only 
by fragments of the glabella, pleura and pygidium. An 
