angiostomata

from The Century Dictionary.

• A suborder of ophidians, comprising serpents in which the mouth is not dilatable, and which are provided with anal spurs. There are two families, Cylindrophidæ and Uropeltidæ.
• In conchology, an artificial group of univalve gastropods whose shell has a narrow or contracted aperture, as cassidids, strombids, conids, olivids, cypræids, and others. Also written, corruptly, Angystomata, and originally Angyostomata by De Blainville, 1818.