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As the blood spreads the toxins around the body , the venom molecules attack the circulatory system : destroying red blood cells , punching holes in the blood vessels , and interfering with blood clotting . An agency determines , as part of its program management , how long it intends to maintain information on its borrowers and how frequently accounts will be reviewed for final disposition . Started in the summer of 2002 with one San Francisco area school and several California Academy of Sciences high school interns , the project is now working with six classes of students at five schools around the Bay Area . We also comment on the status of the name ( e.g ., whether it is validly published or not , legitimate or not , etc. ) . Rather than living on a diet of Achatina , Euglandina prefers to feed on the native species and in some areas like the South Pacific has exterminated the native species . Therefore , predation is greater on young than on mature snails . It was observed that both lots grew to the same size but those grown on the calcium rich diet had shells almost four times heavier than those grown on a calcium deficient diet . The extremely long lateral spinnerets spin sheets of silk used in prey capture : the spider circles rapidly around the prey tying it down with silk . Within seconds the venom molecules begin to destroy tissue around the wound . I started collecting fossil sea shells around my boyhood home , town of San Pedro , California , not knowing then that San Pedro was a famous locale where a number of famous molluscan paleontologists had worked . There were many shell fragments of the tree snail Amphidromus scattered around an exposed rock . An experiment on a Helix aspersa weighing 1/4 oz showed it could drag vertically a weight of 2 1/2 oz ., or ten time its own weight . A list of " Candidates for geocoding " appears ; click on the best-matching place name and you will zoom to that spot on the base map ( see Figure 2 ) .