. 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) . hemarkings on them very irregular in size and distribution, andappear more like warts, or slight depressions, than actual pimc-tures. Measure of diam. of bulb, about .00137. From SouthNaparima, Trinidad, No. 5. 4.—Obehsk pillar; resembles Professor Baileys Rhizosolenia hebetata,which he found in Kamtskatka. This specimen is from Barbados. 5.—Two extraordinary long spines fixed by their smaU and
. 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) . hemarkings on them very irregular in size and distribution, andappear more like warts, or slight depressions, than actual pimc-tures. Measure of diam. of bulb, about .00137. From SouthNaparima, Trinidad, No. 5. 4.—Obehsk pillar; resembles Professor Baileys Rhizosolenia hebetata,which he found in Kamtskatka. This specimen is from Barbados. 5.—Two extraordinary long spines fixed by their smaU and branchedends to a very beautifiil oval disk. Apparently the centre oraxis of some large Polycystiu in slide Barbados, No. lOOJ^,measures from the centre to the point of one spine, . as seen with half-inch objective. 6.—An elegant little transparent plate, without any perforations—apretty crenate edge. In shde South Naparima, No. 2. 7.—A Haliomma (?) long, egg-shaped, very spinous and , Barbados. 8.—The outer margin or circlet of Haliomma Humboldtii, shewingthe points as extensions of the outer sUiceous coat, and notattached to the radial spines or 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
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