. An elementary course of practical zoology. Zoology. GENERAL CHARACTERS 40s chord (Fig. 99, nch) extends to the an- terior end of the animal, and there are no paired limbs. A brain ibr) can hardly be said to be present, and there are no paired olfac- tory, optic, or audi- tory organs. The pharynx is relatively very large, and is perforated by very numerous oblique gill - slits {br. ct), which do not open on the exterior directly, but are sur- rounded by a cham- ber, the atrium (Figs. 99, atr, and 100 A, b^ ; this opens externally by a pore (Figs. 98 and 99, atrp), and though differing in its
. An elementary course of practical zoology. Zoology. GENERAL CHARACTERS 40s chord (Fig. 99, nch) extends to the an- terior end of the animal, and there are no paired limbs. A brain ibr) can hardly be said to be present, and there are no paired olfac- tory, optic, or audi- tory organs. The pharynx is relatively very large, and is perforated by very numerous oblique gill - slits {br. ct), which do not open on the exterior directly, but are sur- rounded by a cham- ber, the atrium (Figs. 99, atr, and 100 A, b^ ; this opens externally by a pore (Figs. 98 and 99, atrp), and though differing in its mode of deve- lopment from the branchial chamber of the tadpole (p. 207), has somewhat similar relations. There is no heart. ^^â¢.: i g ^ B. j; I- J- iH ffl « s vS S *â . s> "S ⢠â S ^ c: w. -^Ti !., s; !,⢠i: S S"g o ....^ °^ ~ s 2-- ?â -;;§ nekâ o M kS13 h C rt h S,S3 3-^Ci, â¢^â D g-g Os^ S,§""n . *^ O . â¢" O u! .. a) "Ni ij +j fli « w g 5 <u,S ;â :â¢.-"â¢.§ 2 2 -h :"â "â .Is G-o k'-S xt; S rt m c > -aS^. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
