68 The American Geolotjiaf. August, ks96 
stout rings, wliicli strongly contrast with the buff-colored 
weathered shale, and which are evidently the bases of the bell 
and of an internal part of the appendage. Also the original 
to fig. 5 (taken from the group pi. IX, tig. 7) exhibits a stout, 
though now, through the action of the acids, somewhat cor- 
roded ring. Another reproduction (tig. 7) of the underside 
of a basal appendage shows the latter removed from the center, 
apparently by the overturning of the young Conularia to 
which it was firmly attached. It is partly preserved in the 
original of fig. 9, and it can be distinctly seen in the basal ap- 
pendage reproduced in fig. 13 (taken from the group pi. VIII, 
fig. 5), where it stands out in relief, while its system of basal 
radial furrows can be seen in fig. 18 at h. 
The real form of this internal body is revealed by a fine 
vertical section through the basal appendage (fig. 3) of a de- 
tached CoDiddrla (fig. 4). This section shows a crescent- 
shaped cleft again of a stout chitinous body, proceeding from 
the converging marginal grooves of the pja'aniid of Conularia. 
The horns of the crescent can be traced to the chitinous mass 
of the basal ring of the bell, the inside of which is visible in 
the section. The original to fig. 5 assists in making evident 
that this crescent is the section of a chitinous ctip-shaped 
body, which is fastened to the apex of the pyramid, while its 
base is continuous with the basal skin, extending to the exte- 
rior bell. The cup itself was not closed basally, as it can be 
inferred from the little node in the center of the impressions 
of the basal appendages (ef. fig. 9</). 
It remains to consider the connection of the pyramid of 
ConvJaria with the basal organ. As the sections figs. 2 and 
3 indicate, the angular grooves of the pyramid curved in 
at the basal end. Tiie subquadrangular piece broken out of 
the dome of the bell in fig. 10 suggests that the shell of Comt- 
laria yet retained its quadrangular section when entering the 
bell. The counterpart of this fossil (fig. 11) has preserved 
the broken-out chitinous piece and exhibits on the latter a 
cross of four ridges, consisting of pyrite. A similar aspect is 
presented by the node in the middle of the basal appendage 
of fig. 17, which is an enlargement of the base of the speci- 
men reproduced on pi. VIII, fig. 4, and which shows two arms 
aiid the intersections of the two others on top of the central 
