. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 214 MARINE BIOLOGICAL LABORATORY. The sense-organ numbered six in the Cyclostome stage (the crista acustica anterior, or anterior canal 9ia. Fig. 16.—The Gnathostome type ear shown here illustrates the method and the extent of the modifications which the Cyclo- stome ear has suffered m its descent to this group. The an- terior and posterior canal organs have each budded off an organ which, in the case of the anterior canal, produces a well-formed canal, the external, prese
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 214 MARINE BIOLOGICAL LABORATORY. The sense-organ numbered six in the Cyclostome stage (the crista acustica anterior, or anterior canal 9ia. Fig. 16.—The Gnathostome type ear shown here illustrates the method and the extent of the modifications which the Cyclo- stome ear has suffered m its descent to this group. The an- terior and posterior canal organs have each budded off an organ which, in the case of the anterior canal, produces a well-formed canal, the external, present in all the members of this group, w^hile the posterior bud never produces a well-formed canal. The utricular recess, which con- tains a number of sense-organs derived from the division of the macula utriculi, is represented as forming a tubular prolongation of the utricular cavity, in order to more clearly show the parallelism of this group of organs with the lagenar group. In no known form does the production of the canal proceed to the extent shown in the diagram. The sense-organs of the lagenar group are repre- sented as separated from each other by an interval, whereas the actual relation in nature is much more # ca Anterior canal. cp Posterior canal. ch External canal. c. ab Abortive canal. u Utriculus. rec. utric Recessus utriculi. rec. sac Recessus sacculi. d Ductus endolymphaticus. s Sacculus. o. de Orifice of the same. organ, of Myxine and Petromyzon) has divided to pro- duce sense-organs ten and twelve of the Gnathostome stage, the cristae acusticas anterior et horizontalis, of the human 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1890
