. Polycystins, figures of remarkable forms &c. in the Barbados chalk deposit (chiefly collected by Dr. Davy, and noticed in a lecture delivered to the Agricultural Society of Barbados, in July, 1846) . USA PLATE II. FIG. 1.—Stylodictja yracilis. Ehrenberg. 2.—A Dictyospiris (?) of Elirenberg, highly developed in slide ZjfCambridge, Barbados. 3.—Dictyospiris (?) or perhaps Petalospiris (?) May they not possiblybe the same organisms in ditterent states of development ?Ceratospiris, (Mikrogeologie, PI. XXTT, fig. 37,) also resemblesthese shapes which occur in great variety in the Barbadosdeposits
. Polycystins, figures of remarkable forms &c. in the Barbados chalk deposit (chiefly collected by Dr. Davy, and noticed in a lecture delivered to the Agricultural Society of Barbados, in July, 1846) . USA PLATE II. FIG. 1.—Stylodictja yracilis. Ehrenberg. 2.—A Dictyospiris (?) of Elirenberg, highly developed in slide ZjfCambridge, Barbados. 3.—Dictyospiris (?) or perhaps Petalospiris (?) May they not possiblybe the same organisms in ditterent states of development ?Ceratospiris, (Mikrogeologie, PI. XXTT, fig. 37,) also resemblesthese shapes which occur in great variety in the Barbadosdeposits. 4.—Rhabdolithes pipa. spined stem var. Ehrenberg places Rhabdo-litlies in the family of Geolithen. 5.—Stephanolithes nodosa.; also a Geolithen of Ehrenberg. 6.—Acanthodesmia of J. Miiller (INIittelmeeres, p. 30) Stephanolithesspinescens (?) of Ehrenberg. It occurs in double and singlecirclets, and witli \arj-iug number of spines in the JG2 f, USA PLATE III. ria. 1.—A Polycystinous nucleus, with one spine running through it, andattached at eaeli end to a plain circle of Silex.—(In slide P>. , Barbados) Lithocircus, Mesoceua (V) 2.—A similar nucleus with four Acanthometrum-shaped spines (seeMnllers Mittelmeeres, &c., PI. X.) attached to it, the hooks ofwliicli describe part of a circle. Actiniscus (?) in slide T. Cam-bridge, Barbados. 3.—A Hyaline wand, sjiirally twisted. 4—^Rhabdolithes pipa. var. Ehrenberg.
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