The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 75 cyclospondylous type, l)ut the outer circle is usually a thin sheet. Such a type of calcification is known as tecfospofidyly. A modification of the tectospondyl- ous type may add still other outer circles, as, for example, in Squatina. A sagittal section through this type would show the heavy inner circles as V's above and below, which are concentrically surrounded by sections of other circles, appearing as more or less straight lines. A most interesting and varied type of calci
The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 75 cyclospondylous type, l)ut the outer circle is usually a thin sheet. Such a type of calcification is known as tecfospofidyly. A modification of the tectospondyl- ous type may add still other outer circles, as, for example, in Squatina. A sagittal section through this type would show the heavy inner circles as V's above and below, which are concentrically surrounded by sections of other circles, appearing as more or less straight lines. A most interesting and varied type of calcification is arranged around the inner zone of the notochordal sheath as a central hub from which spokes or rays diverge in a star-like fashion through the outer zone (asterospondyly).
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