Dec 26-1906 New York City Aquarium. Shrimps are very active, swim about by the action of the abdominal appendages, using the anterior limbs for crawling but in the main for holding when alighting on rocks, sprays etc. The anterior small antennae are held forward while the posterior larger ones are held out sideways. When in danger they give backward and lightning speed. The movement is so quick that one can not see how they do it. It must be done by gathering the fin-like tail under the body, which they otherwise hold stiff and extended in line with the body. Salt water ells. The young are very active swimming over the ground. Without hesitation they shore under the crabs generally under the region of the mouth, evidently seeking to take food away from the crabs. They are evidently just fighters. When at rest they lie under algae or coral a pose holding the dead in a very alert way. The ells young and old are graceful swimmers, moving about with long serpentine movements.