20 
of larger and smaller corallites that suggests the mesospores of certain 
bryozoans. A longitudinal section in one well-preserved part shows three, 
large, complete pores arranged in a vertical row in the wall of one corallite, 
with two partly effaced by grinding in another face of the wall. The 
larger tubes show cups quite half their own length, and there seems to be 
some form of delicate longitudinal striation within the cup. This, however, 
may in part be due to the nature of the silicification. 
Horizon and Locality. Richmond: Beaverfoot. Stoddart Creek sec- 
tion, Windermere area, B.C. 
BRYOZOA 
There is a single bryozoan, which like Diamesopora is a hollow tube, 
but the specimen is more robust than is usual with that genus. It is too 
poorly preserved to admit of identification. 
Horizon and Locality. Richmond: Beaverfoot. Between Spray and 
Palliser rivers, Palliser pass, Kananaskis area, B.C. 
BRACHTOPODA 
Rhynchotrema windermeris n. sp. 
Plate IV, figures 1, 2, 3, 4 
Shell very large for this genus, the best-preserved pedicle valve 
measuring 30 mm. in length, and about the same or less in width. Greatest 
width anterior to the middle. Beaks, particularly that of the pedicle 
valve, more acuminate than is usual in Rhynchotrema. Fold on the 
brachial valve inconspicuous at the beak, becoming steep-sided and 
prominent, corresponding sinus on the pedicle valve hardly to be dis- 
tinguished at the beak, becoming deeper with maturity but with sides 
more sloping than those of the fold. Pedicle valve not so convex as the 
brachial valve. Both valves covered with strong, radiating, simple striae, 
broadly rounded on top with narrow, deep troughs between, four on the 
fold, and four to six on each side, the corresponding number on the pedicle 
valve with three in the sinus. In the embryonic stage apparently there 
were only two striae on the fold revealed by the eating away of the shell 
by acid. The bifurcation took place in the very early stages of growth, 
the weaker stria in each case defining the top of the steep fold, the two 
larger striae in the centre. The median trough between the two original 
striae is deeper than the subsidiary troughs between the two branches of 
each bifurcated stria. The three striae in the sinus appear to originate 
separately at the beak. All are crossed by fine growth lines producing 
an ornamentation very similar to R. capax. 
Internally the brachial valve is of a typical Rhynchotrema structure 
in the division of the long septum to form a support for the rather small, 
stout crural plates, and in having the linear cardinal process lying along 
the bottom of the crural cavity, but the narrow cavity itself pertains to 
the Camarotoechia type in that it does not extend to the bottom of the shell. 
