Archive image from page 355 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 280 RESPIRATION. their vascular system {figs. 227, 228.) Like those of the ranidae they are clothed in a vibratile epidermis, numerously starred by pigmental cells, in common with the rest of the body. For some time before the deca- dence of these organs in the larvae of the triton they cease to exhibit the phenomenon of ciliary vibration. The vibratile epidermis undergoes a change by which the ciliated cell becomes succedeed by the simple. This event foretel
Archive image from page 355 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 280 RESPIRATION. their vascular system {figs. 227, 228.) Like those of the ranidae they are clothed in a vibratile epidermis, numerously starred by pigmental cells, in common with the rest of the body. For some time before the deca- dence of these organs in the larvae of the triton they cease to exhibit the phenomenon of ciliary vibration. The vibratile epidermis undergoes a change by which the ciliated cell becomes succedeed by the simple. This event foretells the approaching extinction of the parts. In their earliest condition the branchiae of the newt discover only four minute simple cylindri- cal filaments. Each 'rows in length and thick- O ~ ness, and throws out from the inferior surface a double row of pectinated processes. These are more complexly constructed than the pri- mitive filaments. They carry not only an afferent and efferent trunk, but an elaborate plexus of capillary vessels. The pigment cells are limited in their distribution to the larger lobes, and to the line of the larger vessels. The epidermis of the secondary processes of the branchiae is reduced to extreme tenuity. Through it the eye readily tracks the move- ments of the individual blood corpuscles on the branchial capillaries. These elliptical bodies move like a boat, their long axes coinciding with that of the channel in which they are travelling. Sometimes several proceed abreast. The diameter of the vessels of the temporary branchiae is greater than those of the lungs. In general terms it can be confidently stated that the quantity of blood circulating in the temporary branchiae of the amphibia, at the period of their maximum development, is far less in relation to the amount contained in the whole body than that which the lungs, when fully formed, are capable of carrying. This inferior amount of blood is physiologically ex- pressive of an inferior f
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