. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 514 ANATOMY OF One of the gills of the Newt, magn. ccLxvill. 344 loop, but speedily expanding, lengtliening and brandling into lateral processes with corresponding looplets ; these blood-channels intercommunicating by a capillary network, as at d, fig. 343. The gill is covered by ciliated 343 scales, ib. e, which change into nonciliated epithe- lium, /, shortly before the gills are absorbed. The size of the gills is as the proximity of their deve- loping vascular arch to the propelling organ of the blood. I
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 514 ANATOMY OF One of the gills of the Newt, magn. ccLxvill. 344 loop, but speedily expanding, lengtliening and brandling into lateral processes with corresponding looplets ; these blood-channels intercommunicating by a capillary network, as at d, fig. 343. The gill is covered by ciliated 343 scales, ib. e, which change into nonciliated epithe- lium, /, shortly before the gills are absorbed. The size of the gills is as the proximity of their deve- loping vascular arch to the propelling organ of the blood. In the Proteus anguhius three pairs only of branchial and vascular arches are developed, corresponding with the number of external gills. In Siren lacertina, as in caducibranchiate Batrachians, there are four pairs of branchial arches ; the first and fourth being fixed, the second and third free: their contiguous borders on the concave side are provided with small interlocking processes. The gills are in three pairs, increasing in size, according to the above- stated dynamic condition, from the first to the third, which is attached to both the third and fourth arches: the upper or outer surface is entire and covered by ordinary integument; the under or inner surface is produced into pinnatifid fringes, supporting the capillary branchial vessels and covered by thin epitlielivim. Each gill is attached by its base an- terior to and above the gill-slit, which it overhangs. In the Axolotl, fia;. 344, the friu2;cs of the gills are longer and more slender. In the 3feiiohronchHS they resemble those of the Triton. In the Siren, Pro- tens, and Menobranchns the outer gills are persistent, and. perhaps, Ciirculfitlng and respiratory nrpiins. A\, '^ . - . i , -r i <• ji AMMe^w^ica„, wiLxvn, also lu Axolotcs. in cach ot tliesc. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
