121 {119) Test has supplementary chambers; size is 

 minute. Diameter about 0.20 mm. a. Spiral 

 view; b, umbilical view; c, edge view , Eoeponidella pulchella 



X175 



121 (/yP) Test laci<s supplementary chambers 122 



122 (121) Apertures, consisting of sutural slits, are M, \_/a \ J^ ^^^-^ ^h 



present on both spiral and umbilical sur- '' Y 1 n D 



faces. Diameter 0.25-0.35 mm. a, Spiral 

 view; b, umbilical view; c, edge view . . . . Helenina anderseni 



122 {121) Aperture is confined to the umbilical side 123 



123 (122) Aperture is single 124 



123 (122) Apertures are multiple or complex 126 



124 (123) Aperture is a curved slit extending into the 

 apertural face. Diameter about 0.15 

 mm. a. Spiral view; b, umbilical view; c, 

 edge view Epistominella vitrea 



X200 



124 (123) Aperture is obscured 125 



125 (124) Aperture is an opening in the center of the 

 umbilicus, obscured by a radiating pattern of 

 fine papillae. Diameter about 0.40 mm. a, 

 Spiral view; b, umbilical view; c, edge 

 view Glabratella wrightii 



X80 



40 



