The Cambridge Natural History
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1889, p. xvii.
198 FISHES CHAP.
substance, but never in the form of true bone. The mode in which the lime is deposited is marked by certain peculiarities which are characteristic of particular families^ (Pig- 113). In some genera, as in the extinct Palaeospinax and the living Acanthias and Scymnus, the calcified portion of each centrum takes the form of a cylinder constricted across the middle, like two cones joined apex to apex (cyclospondylic). This condi- tion is probably the most primitive,... but it may be modified in other genera by the further addition of calcic salts in two different ways. Thus, the deposit may take place by the simple addition of concentric layers to the original constricted cylinder ha - Fig. 113. — Schematic transverse section tiirough tlie middle of a Cyclospondylic (A), a Tectospondylic (B), and an Asterospondylic vertebra (C). d, Middle portion of the calcified double cone ; d\ additional concentric calcified layers ; d'\ double cone "with radiating calcified layers ; ex.m^ external elastic membrane ; h.a, haemal arch ; n.a^ neural arch ; n.c, notochordal cavity.
What to read after The Cambridge Natural History?
You can find similar books in the "Read Also" column, or choose other free books by Harmer, S. F. (Sidney Frederic), Sir, 1862- Ed to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
1889, p. xvii.
198 FISHES CHAP.
substance, but never in the form of true bone. The mode in which the lime is deposited is marked by certain peculiarities which are characteristic of particular families^ (Pig- 113). In some genera, as in the extinct Palaeospinax and the living Acanthias and Scymnus, the calcified portion of each centrum takes the form of a cylinder constricted across the middle, like two cones joined apex to apex (cyclospondylic). This condi- tion is probably the most primitive,... but it may be modified in other genera by the further addition of calcic salts in two different ways. Thus, the deposit may take place by the simple addition of concentric layers to the original constricted cylinder ha - Fig. 113. — Schematic transverse section tiirough tlie middle of a Cyclospondylic (A), a Tectospondylic (B), and an Asterospondylic vertebra (C). d, Middle portion of the calcified double cone ; d\ additional concentric calcified layers ; d'\ double cone "with radiating calcified layers ; ex.m^ external elastic membrane ; h.a, haemal arch ; n.a^ neural arch ; n.c, notochordal cavity.
What to read after The Cambridge Natural History?
You can find similar books in the "Read Also" column, or choose other free books by Harmer, S. F. (Sidney Frederic), Sir, 1862- Ed to read onlineMoreLess
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