The Encrinites of this genus have a light and elegant appearance: the forms of the plates composing the pelvis, and of the ossicula of the arms, are shown in _Lign. 92, fig. 2_; which represents a specimen of _C. planus_, from the magnesian limestone of Somersetshire; a beautiful example of the same species is figured in _Lign. 95_. The receptacle resembles in shape a depressed vase; its upper part was probably covered by a plated integument, having an aperture in the centre as in the Actinocrinites. Cyathocrinites occur in the Silurian, Devonian, and Carboniferous formations.[286] [286] A figure of Cyathocrinus rugosus is given in Pict. Atlas, pl. xlix. _fig._ 4. The same work contains coloured figures of Pentacrinus scalaris (Goldfuss), pl. xlvii. figs. 57, 64, 66; Pentacrinus basaltiformis, pl. xlvii. _fig._ 47. A remarkable receptacle, with the tentacula partially introverted, is figured Pict. Atlas, pl. xlvi. _fig._ 2, from Gloucestershire; and several beautiful examples of the arms, tentacula, &c. of Pentacrinites in Lias limestone and shale, in pl. li. figs. 9, 15, 16, and pl. lii. figs. 1, 2, 3, from Charmouth. Rhodocrinus. (_R. verus._ _Pict. Atlas_, pl. xlix. _fig._ 7, 8.)--A beautiful form, allied to the Antinocrinoids, occurs in the palæozoic rocks, and is named the Rose-encrinite by Miller. The column is cylindrical and traversed by a pentagonal canal. The rays or arms arise by a single ossicle and then bifurcate: the receptacle is formed of three, five, ten, and more numerous series of plates, which are ornamented externally. A fine example of a crinoid of this type (_Hypanthocrinus_) from the Wenlock limestone, is figured in the London Palæontological Journal, pl. xxi. In Sir R. Murchison's Sil. Syst. all the crinoids of the Silurian deposits, then known, are figured. Several new genera are described by Professor McCoy, in the Synopsis of British Palæozoic Fossils. Eugeniacrinus (_Clove-like Encrinite_). _Lign. 92, fig. 1._--These little crinoids, which resemble a clove in form, are found at Mount Randen, in Switzerland, in Oolitic limestone. The receptacle is simple in structure, for it has but one series of plates; its cavity is very small. It had five arms: the articulating surface of the ossicles is radiated. When perfect this crinoidean must have somewhat resembled the Lily Encrinite, but the plates are all anchylosed, or blended together, which Mr. Miller attributed to an early stage of growth. [Sidenote: PENTREMITES PYRIFORMIS.]