65 (64) One or two anterior suboral swellings. Lorica Kettle-shaped; bowl elongate 

 with suddenly pointed posterior. Family PTYCHOCYLIDIDAE, in part 

 (Ptychocylis) (also see couplet 69). 



65 (64) No anterior suboral swellings. Lorica elongate, chalice-shaped, 

 with long, narrow aboral pedicle. Family XYSTONELLIDAE. 



66 (57) A spiral band over at least oral one-half of lorica. Family 

 COXLIELLIDAE in part (also see couplet 60). 



66 (57) Lorica simple, ribbed or ringed, but without spiral structures 67 



67 (66) Lorica short, cup- or goblet-shaped 68 



67 (66) Lorica long, bell- to trumpet-shaped 69 



26 



