• Webster's Revised Unabridged Dictionary
    • n. pl Cyclostoma (Zoöl) A division of Bryozoa, in which the cells have circular apertures.
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Century Dictionary and Cyclopedia
    • n cyclostoma The typical genus of the family Cyclostomidæ: so called from the circular aperture of the Shell. Very different limits have been given to it, the old writers including not only all the true Cyclostomidæ. but also the Cyclophoridæ and Pomatiidæ, while by most modern writers it is limited to those with a calcareous paucispiral operculum flattened and having an eccentric nucleus. The species are numerous; they live in damp places. C. elegans is an example. See cut under Cyclostomidæ. Also Cyclostomus.
    • n cyclostoma The cyclostomatous vertebrates, or myzonts.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. ky`klos circle + sto`ma -atos mouth


In literature:

S. cyclostoma, n. sp.
"Narrative Of The Voyage Of H.M.S. Rattlesnake, Commanded By The Late Captain Owen Stanley, R.N., F.R.S. Etc. During The Years 1846-1850. Including Discoveries And Surveys In New Guinea, The Louisiade Archipelago, Etc. To Which Is Added The Account Of Mr. E.B. Kennedy's Expedition For The Exploration Of The Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist To The Expedition. In Two Volumes. Volume 1." by John MacGillivray