65 (64) Plate-shaped, planktonic (Fig. 142). Until Dorjes (1970) de.scribed Haplodiscus bocki, members of this genus 

 had been reported to lack a seminal bursa, so this genus is retained under both headings in this key (.see 79 

 (63), Fig. 168) Genus Haplodiscus. 



Figure 142. — Haplodiscus bocki: a-dor^al view; i>-sagitlal reconslruction; c-sagitlal reconstruction of male and female accessor)' organs. 



65 (64) More or less elongated in shape, benthic 



.66 



66 (65) Cuticularized nozzle present as an appendage on the seminal bursa (Fig. 143) 67 



Figure 143. — Conaperta norn-egica. 



66 (65) Cuticularized nozzle absent; spermatic duct invaginated into the seminal bursa may be cuticularized (Fig. 



144) 73 



Figure 144. — Postaphanostoma atriomagnum. 



43 



