Journal of morphology . •^ 360 AVERS. EXPLANATION OF PLATE XIL Fig. I. A view in perspective of a portion of the mammalian cochlear organ— organ of Corti. The details are those of the human and Rabbit ears. The figuresof the preceding plates render explanatory letters unnecessary. The hair cells are seen in various conditions, those in the section having theirhistological detail sketched in. The hair filaments are represented in some of themore important and usual conditions. Their normal relation to the sense cells isshown by the last row of hair cells. Many minor details of cochlear an
Journal of morphology . •^ 360 AVERS. EXPLANATION OF PLATE XIL Fig. I. A view in perspective of a portion of the mammalian cochlear organ— organ of Corti. The details are those of the human and Rabbit ears. The figuresof the preceding plates render explanatory letters unnecessary. The hair cells are seen in various conditions, those in the section having theirhistological detail sketched in. The hair filaments are represented in some of themore important and usual conditions. Their normal relation to the sense cells isshown by the last row of hair cells. Many minor details of cochlear anatomy areleft out to secure clearness of the picture, which is true to nature as far as it goes,and disputed points which have no definite and positive solution in my investigationsare not introduced. X about 1500. ?inidl of Mo/i//o/o(jij I ol. 17 Fl Volume VI. July, i8g2 Number j. JOURNAL MORPHOLOGY THE CELL-LINEAGE OF NEREIS. A CONTRIBUTION TO THE CYTOGENY OF THE ANNELID BODY. EDMUND B. WILSON. TABLE OF CONTENTS. PageIntroduction 362 I. The unsegmented ovum 375 II, General sketch of the development 377 III. Spiral period of cleavage 383 1. The first cleavage 383 2. The second cleavage 385 3. The third cleavage i^J 4. The fourth cleavage 388 5. The fifth cleavage 390 6. (a) Third spiral cleavage of the primary micromeres; Qa) for- mation of the apical rosette; origin of the second somatoblast ;(c) second division of the first somatoblast 392 IV. Transition to the bilateral period 393 1. (a) Bilateral division of the posterior primary micromeres; (b) third division of the first somatoblast; {c) fission of the secondsomatoblast 394 2. History of the first group of micromeres; origin of the cross and of the prototroch 395 V. Bilateral period of cleavage 399 1. General histo)y of the upper hemisphere ; origin of the head-kidney . 400
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Keywords: ., bookauthorwistarin, bookcentury1800, bookdecade1890, bookyear1892
