79 (63) Plate-shaped; planktonic (Fig. 168); until Dorjes (1970) described Haplodiscus bocki, the members of this 

 genus had none of them been reported as having a seminal bursa, so the genus is retained under both headings 

 in this key (see 65 (64), Fig. 142) Genus Haplodiscus. 



Figure 168. — Haplodiscus piger. a-doisal view; b-sagitlal reconstruction. 



79 (63) Not broad and flattened but more or less elongated in shape or oval; benthic 



.80 



80 (79) False seminal vesicle present (Fig. 169) . 



.81 



Figure 169. — Rimicola glacialis. 



80 (79) True semnal vesicle present (Fig. 170) 82 



^^ 



Figure 170. — Pseudaphanostoma psammophiluni 



JM 



52 



