Among a great number of specimens of Crinoidea from the Mountain Limestone collected by me during several years past, there are many parts of columns which shew an enlargement of the diameter or bulging similar to that described by Miller as representing “the remedial effect of calcareous secretion in repairing an injury of the joints of the stem,” and some few portions have occurred having the appearance of a small column rising from the centre of a larger one as shewn in Woodcut fig. 1.