. 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) . 03 n ;.1A USA PLATE IX. Fit). 1.—Petalosi^iris foveolata—var. Ehr., (INIikrogeologie, Taf. XXXIV,14.) .0075 high, spiues iiiduded, .0031 dia. of ball. 2.—The same without the central spike through it. 3.—A Podocyrtis (?) of Ehreuberg. 4.—A Podocyrtis (?) nearly akin to Podocyrtis Mglea. (JVIik. B. IS); measures .0106 high, .0052 broad. 5.—A Podocyrtis (?) without the usual surmountmg s
. 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) . 03 n ;.1A USA PLATE IX. Fit). 1.—Petalosi^iris foveolata—var. Ehr., (INIikrogeologie, Taf. XXXIV,14.) .0075 high, spiues iiiduded, .0031 dia. of ball. 2.—The same without the central spike through it. 3.—A Podocyrtis (?) of Ehreuberg. 4.—A Podocyrtis (?) nearly akin to Podocyrtis Mglea. (JVIik. B. IS); measures .0106 high, .0052 broad. 5.—A Podocyrtis (?) without the usual surmountmg spme. 6.—A Lilliomelissa (?) These beautifid little shapes, like tea-pots or coflee-pots, for some primeval worlds Queen Mah, arefrequent in the Barbados ITY ;sA PLATE X. PIU cross, with tubular canals running through the armsand united by a central ring,—a structure resembling an objectfio-ured in Professor W. J. Baileys Microscopic forms in theSea of Kamschatka, under the name Spongolithes orthogona,but which he says he has referred with some hesitation toSpongolithis. Measures .01125 high, .008 broad, with a slightlywarted or rugose surface. 2. All Eucyrtidium form bearing tubular spinous projections, arranged in the pattern of the perforations m Eucyrtidium elegans;appears to be enclosed in a transparent egg-shaped sheath orenvelope, .00362 long—Lithobotrys adspersa, Ehr. Mik. , fit;. 5, has the appearance of a wing or fin extending,round the object in a somewhat similar way, and so iius Jarpo-canium solitarium, Taf. XXII, fig. 28. This specimen is iniSlide No. 611 Springfield, Barbados. g. Eucyrtidium (?) elegans, in an imconstricted state, .004 long, .0012 broad • 2-3 rows of nearly equi-distant per
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