@article {50,
	title = {Ophiuroid <i>Ophiocanops</i> (Echinodermata) not a living fossil},
	journal = {Journal of Natural History},
	volume = {11},
	year = {1977},
	pages = {377{\textendash}380},
	author = {Hotchkiss, F. H. C.}
}
@book {34,
	title = {Ontogeny and Phylogeny},
	year = {1977},
	pages = {501},
	publisher = {Belknap Press},
	organization = {Belknap Press},
	address = {Cambridge},
	author = {Gould, S.J.}
}
