murchisonia

[Named after Sir Roderick 1. Murchison, the geologist (1792-1871).] Palæont .: A genus of Haliotide. The shell is Long a ted, many-whorled, sculptured, and zoned, with the outer lip deeply notched. Fifty species are known; from the Silurian to the Permian. (S. P. Woodward .) mür-chi-son-ite, subst . [After Sir Roderick I. Murchison, an English geologist; suff. -ite ( Min .).] Min.: A variety of orthoclase (q. v.) found in large crystals, having a peculiar reflection like that of moon-stone, in a large-grained quartz-felsite.