@article {536,
	title = {Descriptions of sixty new forms of mollusks from the west coast of North America and the north Pacific Ocean, with notes on others already described},
	journal = {American J. Conch},
	volume = {7},
	year = {1871},
	pages = {160},
	chapter = {93},
	author = {W.H. Dall}
}
@book {549,
	title = {Pseudothecosomata, gymnosomata and heteropoda (gastropoda)},
	year = {1976},
	pages = {484},
	publisher = {Bohn, Scheltema \& Holkeme Utrecht},
	organization = {Bohn, Scheltema \& Holkeme Utrecht},
	address = {Amsterdam},
	isbn = {9031301760},
	author = {S. Van Der Spoel}
}
@article {559,
	title = {Les Gymnosomes I. Carlsberg Foundation{\textquoteright}s Oceanographical Expedition Round the World 1928-30 and Previous "Dana"-Expeditions},
	number = {20},
	year = {1942},
	pages = {11-47},
	publisher = {The Carlsberg Foundation},
	author = {A. Pruvot-Fol}
}
