Tertiary. | PALMONTOLOGY OF VICTORIA. [Protozoa and Zoophyta. 
EXPLANATION OF FIGURES. 
Plate XLVIII.—Fig. 2, specimen of lower conical end, natural size. Fig. 2a, circular section 
at portion marked, (corresponding with the circular section of the living form, fig. 5c). Fig. 20, 
subq uadrate section at upper end of fragment, (corresponding to subquadrate section of living 
form, fig. 5). Fig. 3, another specimen, natural size, with the lower conical apex broken off. 
Fig. 3a, tetrahedral section of upper end with concave sides and rounded angles, (corresponding 
to fig. 5a, section of the living form). Fig. 30, circular section of lower end of fragment, (cor- 
responding to fig. 2a of previous fossil, and fig. 5¢ of living form). Fig. 4, portion from more 
near upper end, showing the ridges between the four concave sides forming longitudinal 
slightly twisted rounded ridges, (corresponding to fig. 5d, magnified portion of living type). 
Fig. 4a, transverse section showing the distinct radiated structure with occasional concentric 
lines of growth and external dense layer, (corresponding to top of magnified fig. 5d, from living 
type). Fig. 4b, view of a second side of same specimen as fig. 4. Fig. 4c, view of a third side 
of same specimen as fig. 4. Fig. 4d, view of fourth side of same specimen as fig. 4. 
Fig. 5, internal axis of the living Victorian sea-pen, Sarcoptilus grandis (Gray), natural 
size. A small portion is broken off the basal tetrahedral portion (which is represented upwards 
for more convenient comparison with the fossil Graphularia, the form of the upper and lower 
sections of which are reversed). The upper end tapers to a filiform point, which is flexible, as 
represented near the bottom of the plate, but is straight when in its natural position imbedded 
in the fleshy substance of the polypes. Fig. 5a, tetragonal section with concave sides and 
rounded angles at point marked, magnified to show the identity of radiated structure and 
general shape with the other end of the fossil. Fig. 5b, subquadrate section at point marked, 
magnified to show the identity with the subquadrate section of part of the fossil and the 
external superficial layer, radiated structure, and concentric lines of growth. Fig. 5c, circular 
section of opposite end, magnified to compare with section of circular portion of fossil. Fig. 5d, 
portion of sides of tetragonal end of axis with the four prominent rounded ridges, concave sides, 
external dense layer, radiated transverse fracture and concentric lines of growth, magnified to 
compare with the fossil, fig. 4, 
Freprerick McCoy. 
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