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Tuatara: Volume 3, Issue 2, August 1950

Explanation of The Illustrations — Note: The figures are not drawn to scale; where size is of diagnostic significance, the dimensions are given in the appropriate section of the key. — Fig. 1. Thalassometra echinata—calyx, bases of some arms, and three cirri (the others are broken off). — Fig. 2. Charitometra basicurva—calyx, arms and a cirrus; note the characteristic transverse ridges on the arm-joints. — Fig. 3. Argyrometra mortenseni—calyx and arm-bases; apparently all the cirri have been br…

Explanation of The Illustrations Note: The figures are not drawn to scale; where size is of diagnostic significance, the dimensions are given in the appropriate section of the key. Fig. 1. Thalassometra echinata—calyx, bases of some arms, and three cirri (the others are broken off). Fig. 2. Charitometra basicurva—calyx, arms and a cirrus; note the characteristic transverse ridges on the arm-joints. Fig. 3. Argyrometra mortenseni—calyx and arm-bases; apparently all the cirri have been broken off, leaving only the cluster of scars showing on the calyx. Fig. 4. Glyptometra inaequalis—showing the diagnostic features. Fig. 5. Stiremetra breviradia—calyx, part of the crown and some cirri. Fig. 6. Pentametrocrinus semperi—the presence of only 5 arms is characteristic; 3 arms only can be seen in this side-view. Fig. 7. Hypalocrinus naresianus—the whole animal, illustrating the general habit of a stalked crinoid, with the crown of arms surmounting the calyx, which lies at the free end of an anchored stalk. The stalk is divided into joints, and every so often a joint bears a ring of tentacle-like cirri. Fig. 8. Hypalocrinus naresianus—characteristic mode of branching of a ray to form two slender arms, of which only the bases are here shown.

Explanation of The Illustrations
Note: The figures are not drawn to scale; where size is of diagnostic significance, the dimensions are given in the appropriate section of the key.
Fig. 1. Thalassometra echinata—calyx, bases of some arms, and three cirri (the others are broken off).
Fig. 2. Charitometra basicurva—calyx, arms and a cirrus; note the characteristic transverse ridges on the arm-joints.
Fig. 3. Argyrometra mortenseni—calyx and arm-bases; apparently all the cirri have been broken off, leaving only the cluster of scars showing on the calyx.
Fig. 4. Glyptometra inaequalis—showing the diagnostic features.
Fig. 5. Stiremetra breviradia—calyx, part of the crown and some cirri.
Fig. 6. Pentametrocrinus semperi—the presence of only 5 arms is characteristic; 3 arms only can be seen in this side-view.
Fig. 7. Hypalocrinus naresianus—the whole animal, illustrating the general habit of a stalked crinoid, with the crown of arms surmounting the calyx, which lies at the free end of an anchored stalk. The stalk is divided into joints, and every so often a joint bears a ring of tentacle-like cirri.
Fig. 8. Hypalocrinus naresianus—characteristic mode of branching of a ray to form two slender arms, of which only the bases are here shown.