68 (67) Oral margin built into outer collar and inner shelf. 

 Lorica clear. Family PETALOTRICHIDAE. 



68 (67) Oral margin simple, without collar and shelf , and narrowed. 

 Lorica simple or with rings. Family UNDELLIDAE. 



69 (67) Wall trilaminate. Oral margin not flared, and without ribs or striae. Lorica 

 bell- or kettle-shaped; bowl typically cylindrical, elongate, with posterior point 

 or horn. Family PTYCHOCYLIDIDAE, in part (Favella) (also see couplet 

 65). 



69 (67) Wall simple, two layered. Oral margin flared. 

 Lorica cup- to spindle-shaped 



Ribs or striae often present. 



70 



70 (69) Oral aperture slightly flared, with broad, grooved rim. Longitudinal ribs 

 or striae always present. Lorica cone- or chalice-shaped. Aboral end 

 closed. Family RHABDONELLIDAE. 



n 



70 (69) Oral aperture flared, simple. Longitudinal ribs sometimes 

 present. Lorica elongate, usually vase-shaped. Aboral end 

 open or closed. Family TINTINNIDAE in part (also see coup- 

 let 59). 



u 



27 



