Ruedem ann— Sessile Con ul aria. 



709 



apparently was attached to a little fragment of a Stictoporella. It appeared at 

 first like figure 15 ; the dissolving of the enclosed rock, however, brought out 

 the entire base of the organ, namely, the broad, deeply-impressed exterior ring 

 (a), the impression of the somewhat wrinkled film (b) stretching towards the 

 center of the base and connecting with an internal part (<?) that appears as a 

 narrower, radially furrowed impression of a ring. The latter can be seen very 

 distinctly at the bottom of the basal appendage reproduced by figure 1. In 

 the remarkable specimen belonging to figure 6, all chitinous parts have been 

 removed by weathering except two stout rings, which 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. The original of figure 5 

 (taken from the group PI. II, fig. 7) exhibits also a stout, though now, 

 through the action of the acids, somewhat corroded ring. Another 

 reproduction (fig. 7, PI. Ill) 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 figure 9, Plate III, and it can be distinctly seen in the basal 

 appendage reproduced in figure 13, Plate III (taken from the group PI. I, 

 fig. 5), where it stands out in relief, while its system of basal radial furrows 

 can be seen in figure 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 detached Conularia (fig. 4, PL III). 

 This section shows again a crescent-shaped cleft of a stout chitinous body, 

 proceeding from the converging marginal grooves of the pyramid 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 

 of figure 5 assists in making evident that this crescent is the section of 

 a chitinous cup-shaped body, which is fastened to the apex of the pyramid, 

 while its base is continuous with the basal skin, extending to the exterior 

 bell. The cup itself was not closed basally, as can be inferred from the 

 little node in the center of the impressions of the basal appendages (cf. fig. 



It remains to consider the connection of the pyramid of Conularia with 

 the basal organ. As the sections figures 2 and 3 indicate, the angular 

 grooves of the pyramid curved in at the basal end. The subquadrangnlar 

 piece broken out of the dome of the bell in figure 10 suggests that the shell 

 of Conularia yet retained its quadrangular section when entering the bell. 

 The counterpart of this fossil (fig. 11) has preserved the broken-out chitinous 



