tropterid)
The Century Dictionary and Cyclopedia · 1897 · p. 90
A gastropod of the family Gas- as Gastrotrich a. teropterida. Gaster opter ide, Gastropteridæ (gas"te-rop-, gas-trop-ter'i-dē), n. pl. [NL. (Swains on, 1840), ones. The shell is internal, small, and nautili form or patulous. Between 20 and 30 species are known. Gaster opter on, Gastropteron (gas-te-rop'-, gas-trop'te-ron), n. [NL. (Meckel, 1813),
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