New Muscular Fibres of both the striped and unstriped variety, would appear to be capable of being developed from connective-tissue-corpuscles. In both varieties the connection with the nervous system is effected by filaments of nerves entering the interior of the fibre ; in striped fibres the filaments end in swellings or expansions in or on the striated substance, and in unstriped fibres certain observers trace them to the nuclei of the fibre-cells.