Edward Drinker Cope,
On some reptilian remains
(1869)
“ The former was thus shown to belong to the true Sauropterygia, and not to the Streptosauria, of which Elasmosaurus was the type. Several distal caudals were anchylosed, without chevron bones, and of depressed form, while proximal caudals had anchylosed diapophyses and distinct chevron bones. ”
