Thalassema papillosum (Delle Chiaje), a forgotten Echiuroid Gephyrean. 439 



6. Kowalevsky, A. 0., in: Zeit. Wiss. Z. 22. Bd. 1872 p. 284. 



7. Müller, M., Observationes anatomicae de Vermibus quibusdam maritimis. 



Inaug. Diss. Berlin 1852. 



8. Rietsch, M., Etüde sur les Géphyriena armes oii Echiuriens. in: Recueil 



Z. Suisse Tome 3 1886 pp. 313—515 pl. 17—22. 

 0. Selenka, E., Gepbyrea. in: Rep. Challenger Vol. 13 1885 25 pp. 4 pl. 

 10. S lui ter, C. Ph., Über zwei merkwürdige Gephyreen aus der Bai von 

 Batavia. in: Nat. Tijd. Nederl. Indie Batavia 48. Bd. 1888 pp. 233 

 —248 pl. 1—3. 



Description of Piate 13. 



Fig. 1. Tl/alassrma papillosum (Delle Chiaje , painted from life by C. Mer- 



CULIANO. 



Fig. 2. One of the Ersatzborsten, seen from the side. 



Fig. 3. The same, seen from below. 



Fig. 4. Opening of the neuro-intestinal anastomosis into the ventral vessel; n.c. 

 nerve cord; ìues. mesentery; n.i.a. neuro-intestinal anastomosis; v.v. an- 

 terior part of the ventral vessel ; v.r.' posterior part of the same. 



Fig. 5. The skin, magnified to show the arrangement of the papillae in the 

 anterior part of the body. 



Fig. G. The anterior end of the worm, laid open to expose the internal Organi- 

 zation; ph. Pharynx; er. crop; d.v. dorsal vessel; v.r. vascular ring sur- 

 rounding the digestive canal; n.i.a. neuro-intestinal anastomosis; v.v. 

 ventral vessel; n.c. nerve cord; seg.org. segmental organ; tr. funnel of 

 the same; h. hook. 



