X200 



125 {124) Ventral surface is ornamented by fine radial striae; aperture is under a tongue-shaped projection of the final 

 chamber into the umbilical depression; the minute specimens are frequently found attached in plastogamy. 

 Diameter 0. 10-0. 13 mm. a, Spiral view; b, umbilical view; c, edge view; d, two specimens in plastogamy . .Glabraiellina lauriei 



126 (123) Besides the opening under the edge of the 

 final chamber, supplementary apertures 

 appear as large pores on the apertural face. 

 Diameter 0.60-1.00 mm. a. Spiral view; b, 

 umbilical view; c, edge view; d, e, spiral and 

 umbilical views of large form which may be 

 either gerontic (old age) or a breeding 

 stage Poroeponides lateralis 



X15 



126 (123) Besides the opening under the edge of the final chamber, supplementary apertures consist of an opening at 

 the outer end of each branch of the bulging coating of fine granules that fills the umbilical region 



,127 



127 (126) Test is equally biconvex; periphery is round- 

 ed. Diameter 0.30-0.40 mm. a. Spiral view; 

 b, umbilical view; c, edge view Buccella frigida 



X100 



127 (126) Test is flattened on the umbilical side; 

 periphery is angled. Diameter 0.20-0.30 

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

 edge view Buccella sp 



X150 



41 



