. Analysis of development. Embryology; Embryology. ^tT. Fig. 216. Development of ascidian Botryllus buds from bud discs of varying size, with reference to final size and extent of gonad development (from Berrill, '41). A, Discs of maximum sizes /—4; B, closing spheres developing from discs /—4, with extent of pre- sumptive gonad area indicated in each case by black-out; C, continuation of same series 1—4, showing failure of ova to segregate in / and 2, single and double segregation in 3 and 4; D, sphere stage /—4 reduced to one-fifth previous scale; E, continuation of series 1-—4 on reduced sc
. Analysis of development. Embryology; Embryology. ^tT. Fig. 216. Development of ascidian Botryllus buds from bud discs of varying size, with reference to final size and extent of gonad development (from Berrill, '41). A, Discs of maximum sizes /—4; B, closing spheres developing from discs /—4, with extent of pre- sumptive gonad area indicated in each case by black-out; C, continuation of same series 1—4, showing failure of ova to segregate in / and 2, single and double segregation in 3 and 4; D, sphere stage /—4 reduced to one-fifth previous scale; E, continuation of series 1-—4 on reduced scale as far as bud-disc, gill-slit perforation stage, showing the development of the gonads in the four sizes; bd, bud disc; e, endostyle; h, heart; o, ovum; t, testis. If k is greater than 1, the organ or di- mension grows faster than the body or con- trol dimension; if k is less than 1, it grows more slowly. Given a suitable maximum body-size a positively allometric organ may grow relatively vast, while a negatively weighed the large chela and claw of 401 male fiddler crabs. He fovmd r = :c^-^2 up to a total weight of gm. (at which sex- ual maturity is reached) and r = ^-255 thereafter. Lumer ('37) discusses the relation be-. 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 Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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Keywords: ., bookcentury1900, bookpublisherphiladelphi, booksubjectembryology
