DONDERSIA-MYZOMENIA. 303 



spicules (fig. 61). Over the remainder of the body the extremely 

 thin cuticle is beset with little spicules of a very characteristic form 

 (fig. 61) like a round-bladed shovel, very densely placed, having 

 the flattened end against the cuticle, the narrowed portion lying 

 free. Radula multidentate, very small. 



North of Port Vendres, on tube of Myxicola infundibulum, in 80 

 meters. 



Paramenia palifera PRUVOT, Arch. Zool. Exper. et Gener., (2), 

 ix, pp. 727, 790, pi. 31, f. 74-78 ; pi. 25, f. 4. Cf. WIREN, K. Sv.Vet. 

 Akad. Handl., xxv, p. 17. Macellomenia palifera SIMROTH in 

 Bronn, p. 231, pi. 6, f. 1-4. 



Genus DONDERSIA Hubrecht, 1888. 



Dondersia HUBRECHT, Bonders Feestbundel, etc., p. 324. 



Body elongated, vermiform, cylindrical. Anterior end thickened, 

 club-like. Cloaca opening ventral, the tail projecting above and 

 beyond it finger-like. Foot-groove curving into the cloaca. Foot 

 present. Spicules needle- and shovel-shaped. No gills. Radula 

 present. Ventral and dorsal salivary glands. Length 10 times the 

 breadth. 



D. FESTIVA Hubrecht. PI. 46, figs. 64-68. 



Body narrow, pointed posteriorly, 10 mill, long, 1 mill, wide ; 

 violet colored. Spicules of two kinds : some acicular, others like a 

 shovel or ladle. No caudal sensory organ. Radula much reduced. 

 One pair of short salivary glands. 



Gulf of Naples. 



D. festiva HUBRECHT, Donders-Feestbundel Nederl. Tijdschr. 

 Geneesk., 1888, p. 324-339. PRUVOT, Arch. Zool. Exper. et Gener. 

 (2), ix, p. 730. SIMROTH in Bronn, p. 231, pi. 9, f. 1-6. 



Genus MYZOMENIA Simroth, 1893. 



Myzomenia SIMR., Broun's Thier-Reichs., p. 231. Dondersia 

 PRUVOT, in part. 



Elongated, vermiform, cylindrical. Extremities as in Dondersia. 

 No foot. Foot-groove smoothed out, reduced to a ventral longi- 

 tudinal streak (pi. 47, fig. 75). Spicules shield-shaped or leaf-shaped, 

 shaped. No gills. No radula or radula sheath. Oesophagus long. 

 Two salivary glands. A globular organ above the oasophagus. 

 Length 30 times the breadth. 



