. 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) . PLATE XVn. riG. 1.—Lithornithium Hirimdo of Ehrenberg, Mik., PL XIX, fig. 53, but this is a much finer and more perfect specimen ; frequent in the Barbados deposit: size very variable. 2.—A broad and stunted variety of Podocyrtis Schomburgkii. Mik.,PI. XXXVI, fig. 22. 3.—Podocyrtis (?) with five spined or serrated legs: body and sur-mounting spine all very irregularly foraminated.
. 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) . PLATE XVn. riG. 1.—Lithornithium Hirimdo of Ehrenberg, Mik., PL XIX, fig. 53, but this is a much finer and more perfect specimen ; frequent in the Barbados deposit: size very variable. 2.—A broad and stunted variety of Podocyrtis Schomburgkii. Mik.,PI. XXXVI, fig. 22. 3.—Podocyrtis (?) with five spined or serrated legs: body and sur-mounting spine all very irregularly foraminated. high, .00325 wide. Barbados, slide No. 38. 4.—A Dictyospiris exhibiting the very curious bulbous terminationsof the spines assummg a cellulate (?) appearance. 5.—^A very regularly aerolated small hollow cone, frequent in the SouthNaparima, Trinidad slides. Cornutella profundis Ehr. 6.—^ diaboliscus—Mik., PI. XXXVI, fig. 12—variety, withthe lower spines prolonged and forked at the ends. 1.—Variety of Rhopalocanium (?) S.—Another state of Rhopalocanium, with the wing-like membranesstiU attached to the body, and roughened with irregidar TY PLATE x\an. 1.—A rough spongelike-looking ball with, strong spines. 2.—Spongolithis (?) a spicule. 3.—A state of a Haliomma—strong spokes from central nucleus tocircumference, at imequal distances—some network apparentlyspimiing partly over one side, according to MiiUers description. 4.—Spongolithis anchor a of Ehrenberg—A spicule. 5.—Spongolithis ramosa, Ehr. 6.—Serpent-like form—very frequent and variaOle in the Barbados deposit. 7.—Lithasteriscus reniformis. Ehr., ■■Nord and Stid Amerika fig. 35. / think all these bean-like forms are wartedor rough-ened on the surface, not truly foraminated. 8.—An irregular three-lobed transparent Plate from Chimborazo, Bar-bados, analogous to fig. 6 on PL VII. Dr. Wallich says theseare parts of an organism constituting a new ge
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