Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 533
specimens, the iirst few zones are not com-plete circles, the early growth ha^Tug taken-place rather in a spiral than in aradial direction; between these two plans, there is everj variety of gradation;and even where the spiral is most distinctly marked in the first instance, theadditions soon come… … Composite Animal of simple type of Orbitolites complanatus :—a,central tiiass of sareode; b, circumambient mass, giving off pedmicles,in which origiQate the concentric zones of segments connected byannular bands. sometimes a score or more of radial passages extend them-selves from every part of the…
Microscopy
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