58 (57) Collar present, hyaline, with ring or spiral structure. Lorica top- 

 shaped; aboral end of lorica rounded to pointed; wall of bowl 

 much thicker than that of collar. Family CODONELLOPSIDAE. 



58 (57) Collar without ring or spiral structures, or absent. 



59 



59 (58) Lorica with small prisms and gelatinous mantle with scattered inclusions. 

 Three longitudinal folds on posterior half of lorica. Collar present. Family 

 TINTINNIDAE, in part (Brandtiella) (also see couplet 70). 



59 (58) Not as above. Lorica without longitudinal folds. 



60 



60 (59) Posterior narrowed horn or tail. No collar, 

 part (Poroecus) (also see couplet 66). 



Family COXLIELLIDAE, in 



60 (59) Not as above. Lorica without tail 61 



61 (60) Lorica tubular and sacular, soft, gelatinous, thickly beset with particles. 

 Lorica straight sided or flaring. Family TINTINNIDIIDAE. 



24 



