A flabellate terminal branch. Fig. 6. _Coelodendrum flabellatum_, n. sp., × 150 1737 A flabellate terminal branch. Fig. 7. _Coelodendrum spinosissimum_, n. sp., × 300 1735 Forked distal end of a terminal branch. Fig. 8. _Coelodendrum cervicorne_, n. sp., × 150 1736 One valve of the shell, with its galea and the four tubes arising from it. A network of protoplasm connects the distal branches. Fig. 9. _Coelodrymus ancoratus_, n. sp., × 50 1738 A complete specimen, with the central capsule and the enveloping phæodium. The surface of the spherical calymma is covered by a dense network, from which arise numerous, anchor-bearing, radial tubules. Fig. 10. _Coelodrymus ancoratus_, n. sp., × 150 1738 A small piece of the superficial network of the skeleton, with the zigzag radial tubules arising from it, each of which bears an anchor with two recurved denticulate teeth on the distal end. [Illustration: 1.-8. COELODENDRUM, 9. 10. COELODRYMUS.] PLATE 122. LEGION PHÆODARIA. Order PHÆOCONCHIA. Family COELOGRAPHIDA. Fig. 1. _Coelotholus octonus_, n. sp., × 30 1749 The entire bivalved shell, seen obliquely from the dorsal and somewhat from the right side, enveloped by the yellowish calymma. Fig. 2. _Coelotholus octonus_, n. sp., × 100 1749 One valve of the shell (_h_) with its large galea and the origin of the three styles. The base of the two lateral styles (_g_^1, _g_^2) is connected by two latticed lateral frenula (_b_^1, _b_^2) with the mouth (_m_) of the rhinocanna (_t_). The odd style (_g_^3) is free. Fig. 3. _Coelothauma duodenum_, n. sp., × 20 1750 The entire shell, seen from the dorsal side. The long styles are enveloped by the yellowish calymma. Fig. 4. _Coelothauma duodenum_, n. sp., × 80 1750 One valve of the shell (_h_), seen from the apical side; _t_, rhinocanna; _m_, its mouth; _b_^1, _b_^2, the two lateral frenula; _g_^1, _g_^2, the two paired styles; _g_^3, the odd style. Fig. 5. _Coelothauma duodenum_, n. sp., × 80 1750 One valve of the shell, seen in profile. Characters as in fig. 4. Fig. 6. _Coelothamnus bivalvis_, n. sp., × 30 1751 The entire shell, enveloped by the yellowish calymma, seen from the left side; between the two valves is the central capsule, with nucleus and astropyle. Fig. 7. _Coelothamnus bivalvis_, n. sp., × 100 1751 A single lateral anchor-pencil. Fig. 8. _Coelothamnus bivalvis_, n. sp., × 200 1751 Distal end of a style, with its anchor-pencils. Fig. 9. _Coelothamnus bivalvis_, n. sp., × 400 1751