. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. # JBBCT1 m ij. A. "Nest" of small ova (s. c), each about 1 0 M in diameter, one larger ovum (/.o.) 50 f in diameter. Whole nest contained within special arrangement of stromal cells {st. c.)- X about 300 diameters. B. Developing ovum (m. o.), surrounded by rapidly atrophying small ova \); I., lumen of ovisac; n., " germinative spot"; st., stroma. Diameter of large ovum, 120 /i. X 500 diameters. C. Cross-section of one horn of ovary. /., lumen of ovisac; o., ova; ov. s., ovisa
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. # JBBCT1 m ij. A. "Nest" of small ova (s. c), each about 1 0 M in diameter, one larger ovum (/.o.) 50 f in diameter. Whole nest contained within special arrangement of stromal cells {st. c.)- X about 300 diameters. B. Developing ovum (m. o.), surrounded by rapidly atrophying small ova \); I., lumen of ovisac; n., " germinative spot"; st., stroma. Diameter of large ovum, 120 /i. X 500 diameters. C. Cross-section of one horn of ovary. /., lumen of ovisac; o., ova; ov. s., ovisac; St., stroma. Guide line to st. crosses place of attachment of stroma to median wall of horn of ovisac. X about 50 diameters. D. "Nest of yellow ; Diameter of individual "yellow cells" (^. c.) about 15 Ms/, c, arrangement of stromal ceils around yellow cells, as around "nest" of small ova (st. c, in fig. A.) X 200 diameters. E. Few "yellow cells" more highly magnified to show pigment-granules and general appearance of slow degeneration. Nuclei can not be distinguished in photo- graph, though distinct enough in section. X about 800 diameters. F. 3 adjacent " nests " of ova (n.), each with developing ovum; st. c , stromal cells which separate " nests " and likewise developing ova from one another. X 2 1 0 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 Eigenmann, Carl H. , 1863-1927. Washington, D. C. , Carnegie Institution of Washington
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