. The testimony of the rocks; . SIGILLARIA RENIFORMIS. (Nat. size.) by single rings, like the heads of the bolts of the ship car-penter ; in another {S. reniformis) the knobs are double,and of an oval fomi, somewhat resembUng pairs of kidneys,— a resemblance to which the species owes its name. Inanother species {S. catenulata) Avhat seems a minute chain6* 66 THE PAL^ONTOLOGICAL of distinctly formed elliptical links drops down the middleof each flute; in yet another (S. oculata) the carvings areof an oval form, and, bearing each a round impression in its Fig. SIGILLARIA PACHTDERMA. (One fo
. The testimony of the rocks; . SIGILLARIA RENIFORMIS. (Nat. size.) by single rings, like the heads of the bolts of the ship car-penter ; in another {S. reniformis) the knobs are double,and of an oval fomi, somewhat resembUng pairs of kidneys,— a resemblance to which the species owes its name. Inanother species {S. catenulata) Avhat seems a minute chain6* 66 THE PAL^ONTOLOGICAL of distinctly formed elliptical links drops down the middleof each flute; in yet another (S. oculata) the carvings areof an oval form, and, bearing each a round impression in its Fig. SIGILLARIA PACHTDERMA. (One fourth nat. size.) centre, they somewhat resemble rows of staring goggle-eyes;while the carvings in yet another species {S. pachyderma)consist chiefly of crescent-shaped depressions. The roots,or rather underground stems, of this curious genus attractednotice, from their singularity, long ere their connection withthe carved and fluted stems had been determined, and havebeen often described as the stigmaria of the fossil , too, have their curious cai^dngs, consisting of deeplymarked stigmata, quincuncially arranged, \\ith each a littlering at its bottom, and, in at least one rare species, surroimdedby a sculptured star. Unlike true roots, they terminateabruptly; each rootlet which they send forth was jointed tothe little ring or dimpled knob at the bottom of the stig- HISTORY OF PLANTS. 67 mata; and the appearance of the whole, as it radiated fromthe central mass, whence the carved trmik proceeded, some-what resembled that of an enormous coach-w
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