. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 148 MARINE BIOLOGICAL LABORATORY. PANTOPOD-LAR VA. hydroids. The first pair are three-jointed, — counting the movable claw of the chelae, — the second and third appendages on each side are two-jointed. These last two appendages represent the palps and ovigerous legs of the adult. The body ends anteriorly in a rounded pro- boscis. The digestive tract, beginning at the mouth at the distal end of the proboscis, passes through the proboscis as a tube triangular in cross- section and opens out into th
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 148 MARINE BIOLOGICAL LABORATORY. PANTOPOD-LAR VA. hydroids. The first pair are three-jointed, — counting the movable claw of the chelae, — the second and third appendages on each side are two-jointed. These last two appendages represent the palps and ovigerous legs of the adult. The body ends anteriorly in a rounded pro- boscis. The digestive tract, beginning at the mouth at the distal end of the proboscis, passes through the proboscis as a tube triangular in cross- section and opens out into the wide stomach within the ^3 body proper. There is no posterior opening to the digestive tract, but from the stomach runs forward into the mandibles a pair of diverticulae. The larva has a brain lying dorsal to the oesophagus, which is connected by two commis- sures with a pair of ganglia ventral to the digestive tract. There are in all two pairs of these ventral gan- glia, the pairs more or less fused together; and behind these, and completely detached from them, is a thicken- ins: of ectoderm which indicates the commencement at this place of a third pair. The larva has no heart nor reproductive organs at this stage. It is needless to follow here the changes which this Pantopod-larva (Dohrn) undergoes as it is metamorphosed into the adult. The body elongates, new appendages appear seriatim, the proctodaeum invaginates and puts the digestive tract posteriorly into communication with the outside world, and the second or third pairs of. 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. ). Boston, Ginn & Co
Size: 1523px × 1640px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1890
