L-Lactate, the only known anaerobic end-product in decapod crustaceans (Gade, 1983), increases haemocyanin oxygen-affinity (Tnichot, 1980; Mangum, 1983; Bridges and Morris, 1986). In exercised blue crabs, Callinectes sapidus, the decrease in haemocyanin oxygen-affinity induced by metabolic acidosis via the Bohr shift was substantially balanced by the opposing effect of L-lactate (Booth etal, 19...

receptor for ␣-latrotoxin and that neurexin 1␣ is not a functional receptor (Lelianova et al., 1997). However, the Southwestern Medical Center Dallas, Texas 75235 Ca 2ϩ independence of ␣-latrotoxin action is controversial , and the possible function of neurexins as ␣-latro-toxin receptors has not been tested directly. Studies of neurexin 1␣ knockout mice demonstrated that ␣-latro-Summary toxin ...

ALTHOUGH the physiological and mechanical phenomena of the vasa deferentia resulting in the elaboration of the spermatophores of marine hermit crabs (Pagurida) have been investigated (Mouchet, 1931; Matthews, 1953), these phenomena in terrestrial hermit crabs (Coenobita and Birgus) have been neglected. Spermatophores of marine hermits are made with precision; the so-called immutable form of the...