. Supplement to the appendix of Captain Parry's voyage for the discovery of a north-west passage in the years 1819-20 [microform] : containing an account of the subjects of natural history. Natural history; Sciences naturelles. ccl calciucous rock, in gome specimens from Priiu'e Ilc^'i^ i* i Jdilct, ubou'.iiU wllh parts of the jointed stem and sii\i;le joints of u z {•!«• u l)cloiiginj^ to the natunil order of Encrini ; other specimens aj)pi'ar to be entirel'- witliout these bodies: but on snbjectini; tlie dirterent varieties ofa^grcL^ation to a ch>ser examination, it will be fou
. Supplement to the appendix of Captain Parry's voyage for the discovery of a north-west passage in the years 1819-20 [microform] : containing an account of the subjects of natural history. Natural history; Sciences naturelles. ccl calciucous rock, in gome specimens from Priiu'e Ilc^'i^ i* i Jdilct, ubou'.iiU wllh parts of the jointed stem and sii\i;le joints of u z {•!«• u l)cloiiginj^ to the natunil order of Encrini ; other specimens aj)pi'ar to be entirel'- witliout these bodies: but on snbjectini; tlie dirterent varieties ofa^grcL^ation to a ch>ser examination, it will be found that those uhieh cuntuin no remains mani- festly beh)iiging to the just nientioned ori^anized fossil bodies, are, never- tlielcss, entirely composed of their (htritiis. This encrinitic mass, in single specimens, might reailily be mistakn for a friable variety of conunon granular limestone, did not a comparison of a scries of speeimeris prove that appear- ance tt> be produced by tlu' extreme eonuninution of the substance of those fossil zoophytes, each particle of which still exhibits planes of cleavage parallel to the primitive rhombohedron. The joints of the stem and branches of the zoophyte which ap|)ears to have thus largely contributed to the formation of this mass, arc mostly cylin- drical ; tlieir thickness is in an inverted ratio with that of the column of which Ihcy form parts ; those near the body being the largest and thinnest. Cylin- drical portions of the stem, formed by these thinner vertcbnu, exhibit on their surface hemispheric concavities, some of them large enough to occupy from four to six of the thin joints or vert»'bra\ the lines of se])aration of which are seen to traverse the cavities in a horizontal direction. They are tlic sockets of articulation, in which the branches of the stem were inserted. The casts produced from these concavities in the surrounding nuiss, might, when seen without their moulds, be easily mistaken for distinct organic re
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectsciencesn
