The pouch here is large, sacculated, uncinate, without reduction of the terminal portion.
There are generally thirteen pairs of ribs, and in no case do they have uncinate processes.
The ribs have capitula and tubercula, and often uncinate processes (see p. 190) as in birds.
The peristomium has no setae, and the setae generally are hair-like or uncinate, often forming almost complete rings.
uncinate un·ci·nate (ŭn'sə-nāt', -nĭt)