. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INHERITANCE IN THE "WALKING-STICK. 243 Finally, is this adjustment between the structure of the femora and head due to the position of the insect when enclosed within the inelastic egg shell ? If the first legs were folded forward against the head the pressure during embryonic life might easily be suf- ficient to mold the femur curve into pattern for the head. Twenty eggs containing embryos at various stages shortly preceding hatching were dissected with this question in view. The ellipti- cal egg shell is of a rigid ch
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INHERITANCE IN THE "WALKING-STICK. 243 Finally, is this adjustment between the structure of the femora and head due to the position of the insect when enclosed within the inelastic egg shell ? If the first legs were folded forward against the head the pressure during embryonic life might easily be suf- ficient to mold the femur curve into pattern for the head. Twenty eggs containing embryos at various stages shortly preceding hatching were dissected with this question in view. The ellipti- cal egg shell is of a rigid chitinous material with a circular oper- culum at one end and a hilum-like scar on one side to which the. FIG. 2. An unhatched Aplopus with its egg membranes dissected away showing its folded position. The femora of the three right legs are marked with roman numerals and the tarsal ends of the same legs are indicated by figures. The part of the first femur which in later life fits against the head is shown between the points x-x, it is not molded against the head in the egg. A, antennae ; £, compound eye ; M, mandible. inner egg membrane is attached. The size of the egg ranges from 2 mm. in narrow diameter by 4 mm. in long diameter to 3 mm. by mm. The length of the walking-stick on hatching is from 17 mm. to 23 mm. measured from the tip of abdomen to tip of the first pair of legs when extended forward, or from tip of head to tip of tail mm. to 13 mm. The embryo within the egg is, therefore, necessarily much folded and 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. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
