ON RECENT SPECIES OF SPIRASERPULA REGENHARDT, 1961 



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Fig. 20 Spiraserpula vasseuri sp. nov. A-H, paratypes. A-C, Anterior tube fragments showing granulations, transverse ridges and roughly 

 trapezoidal external outline. A, Shows incompletely formed external longitudinal ridges, and a thickened peristome towards the posterior 

 end of B. D & E, Two views of same posterior coil showing the unserrated dorsal ridge in both, and a serrated ventral ridge consisting of 

 separate teeth in D. F & G, Two views of same anterior tube fragment with an attached posterior coil opened (on the right). The anterior 

 tube fragment has two peristomes; the posterior coiled part (G)has been opened to expose the unserrated dorsal ridge and serrated ventral 

 ridge (G). H, Thorax showing prostomial ocelli, collar, thoracic membranes and chaetigers. 



