. Diversions of a naturalist. Natural history. SAND-HOPPERS 153 fresh-water creature common in weedy streams, which has no English name (except the general one of " fresh- water shrimp "), and is called by naturalists Gammarus. In the open sea there are many hundreds of kinds of small crustaceans resembling the sand-hoppers in their compressed (not flattened) shape of body and in the details of their legs and the grouping of the joints of the body. Many of the smallest crusta- ceans which swarm in the surface waters of the sea and form part of that float- ing population, mostly of sm
. Diversions of a naturalist. Natural history. SAND-HOPPERS 153 fresh-water creature common in weedy streams, which has no English name (except the general one of " fresh- water shrimp "), and is called by naturalists Gammarus. In the open sea there are many hundreds of kinds of small crustaceans resembling the sand-hoppers in their compressed (not flattened) shape of body and in the details of their legs and the grouping of the joints of the body. Many of the smallest crusta- ceans which swarm in the surface waters of the sea and form part of that float- ing population, mostly of small transparent or iridescent and blue creatures, which we call the " plankton," or " surface - float- ing " population, and may be gathered by towing a very fine net behind a boat on a quiet day, can produce flashes of light which are vivid enough when seen at night. They contribute, to- gether with jelly-fish and the teeming millions of minute bladder-like Noctiluca, and other unicellular animalcules, to produce that wonderful display seen from time to time on our coasts, and called " the phosphorescence of the ; These minute crustaceans produce flashes of light by suddenly squeezing from pits or glands in the skin a secretion which is chemically acted on (probably. Fig. 20.—a, Talitrus locusta, h, Orchestia littorea, the two common kinds of "; Of the natural size, c, A kind of small lobster which burrows in the sand, Callianassa subterranea. About two-thirds the natural size, 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 Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London Methuen
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Keywords: ., bookauthorlankestereray, booksubjectnaturalhistory, bookyear1915
