. The Canadian naturalist and quarterly journal of science. Natural history -- Periodicals. 1869.] BILLINGS—ON THE STRUCTURE OP CRINOIDEA, ETC. 427 Fig. 1. The upper part of Caryocrinus ornatus, the test being removed in order to show the internal structure of the fourteen hydrospires that surround the summit. The parallel lines represent the flat tubes. The other figures exhibit the modifications which the hydrospires undergo in passiilg through :—2. Codmter. 3. Pen- tremites with broad ambulacra. 4. Fentremites with single tubes. 5. Paloezmc Crinoids with a convoluted plate attached to t
. The Canadian naturalist and quarterly journal of science. Natural history -- Periodicals. 1869.] BILLINGS—ON THE STRUCTURE OP CRINOIDEA, ETC. 427 Fig. 1. The upper part of Caryocrinus ornatus, the test being removed in order to show the internal structure of the fourteen hydrospires that surround the summit. The parallel lines represent the flat tubes. The other figures exhibit the modifications which the hydrospires undergo in passiilg through :—2. Codmter. 3. Pen- tremites with broad ambulacra. 4. Fentremites with single tubes. 5. Paloezmc Crinoids with a convoluted plate attached to the centre of radiation. 6. Sand canal or madreporic tube of a starfish inclosing a doubly convoluted plate 7. Ambulacral canals of a starfish with the doubly convoluted plate ot the sand canal attached to the oesophageal ring. The following letters have the same reference in all the figures in which they occur: a, an arm or ambulacrum ; ?m v, moHth and vent combined in a single aperture -.^w^s,mouth, vent and spiracle; g, ambulacral groove; p, ovarian pore; s, spiracle; cjp, convoluted plate ; r, oesophageal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Society of Montreal. Montreal, Dawson
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Keywords: ., bookauthornaturalh, bookcentury1800, bookdecade1860, bookyear1869
