. The Cubomedusae. Cubomedusae. 50 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. the visual cells of Schewiakoff, then again we find nonconformity to a spindle-shaped type, and nuclei not always at a lower level. The matter of alternation of nuclei at different levels seems to me any way too slight a distinction upon which to base a difference in function. It is a neces- sary mechanical consequence of the crowding together of many cells on one surface. And in many cases in perfectly radial sections through the retina I find the nuclei fewer in number and arranged in very nearly a single l
. The Cubomedusae. Cubomedusae. 50 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. the visual cells of Schewiakoff, then again we find nonconformity to a spindle-shaped type, and nuclei not always at a lower level. The matter of alternation of nuclei at different levels seems to me any way too slight a distinction upon which to base a difference in function. It is a neces- sary mechanical consequence of the crowding together of many cells on one surface. And in many cases in perfectly radial sections through the retina I find the nuclei fewer in number and arranged in very nearly a single level. The retina of the smaller eye represented in Fig. 69 shows this. In sections further along in the same series the nuclei are found at different levels, due without doubt to the slanting CO [Dr. Conant did not complete Fig. 72, and the accompanying outline of Fig. 7 of Schewiakoff's memoir (Beitrage zur Kenntnis des Acalephenauges, Morph. Jahrb., Bd. XV, H. 1) has been substituted.—EDITOR.] EXPLANATION OF LETTERS IN TEXT FIGURE.—C—concretion cavity ; CO—cornea ; CP—capsule of lens ; CSC—cavity of sensory club ; EC—ectoderm ; EN—endoderm ; ENC—endoderm of sensory club ; L—lens ; NC—network cells ; NF—nerve fibres ; RT—retina ; SLA—supporting lamella ; VF—vitreous body. Fig. 72 is a horizontal section through the large eye, and shows that here, too, when the sections pass through the eye just radially, the. 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 Conant, Franklin Story, 1870-1897. Baltimore, The Johns Hopkins press
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