1 1 



the latter being enclosed by muscles running horizontally and ventrally; besides two 

 lateral sinuses. 



It is much to be regretted that the anterior end of this excellently preserved specimen 

 is wanting. Now it cannot be decided with certainty where to place this form. 



Dinomenia nov. gen. 



Length-index 11 — 20. Spicula pointed, hollow, in many layers above each other in a 

 thick cuticle. Papillae numerous. A dorso-terminal sense-organ is present. Three ventral folds. 

 Two unramified tubular salivary glands, which remain separated. Radula distichous. Cloaca-ducts 

 with vesicular appendages. No gills. 



4. Dinomenia Hubreckti nov. spec. (PI. II, figs 41 — 56, PI. IV, fig. 113). 



Stat. 202. 3°I5'S., I25°43'.8 E. In horizontal cylinder. 3088 M. 1 Specimen. (See Conclusion). 

 Stat. 310. 8° 30' S., 119 7'. 5 E. Between Sumbawa and Flores. 73 M. Upon Gorgonid. 



Length 14 — 16 mm. Length-index 11 — 13. Body rather pointed at both extremities. 

 The mouth-cavity and the opening of the pharynx separated by a fold. Considerable accumulations 

 of unicellular glands around the pharynx. Five rows of radula-teeth. Two stalked vesicular 

 vesiculae seminales and two stalked vesicular receptacula seminis. Two copulation-spicula. 



East-Indian Archipelago. 2 Specimens. 



The length of the hrst specimen is 16 mm.; the diameter 1,25 mm.; the length-index 

 therefore ±13. 



The length of the second specimen is 14 mm.; the diameter also 1.25 mm.; the length- 

 index therefore ±11. 



The colour is brown-yellow, somewhat shining owing to the spicula. The posterior and 

 anterior extremities, both ending rather bluntly, are difficult to distinguish from one another. 

 The ventral groove is clistinct (fig. 41). 



The spicula are shaped like those of Proneomenia Weberi (fig. 42 A). Besides along 

 the ventral groove long, thin, curved spicula and flat massive ones are found (B). In the 

 tolerably thick cuticle the spicula are lying in many layers upon each other. The state of 

 preservation does not permit of the structure of the integument being studied. The papillae, 

 present in great number, are vesicular with many nuclei, placed upon broad, multinucleated 

 pedicles. Here the mode of growth also corresponds to that of Proneomenia longa : first the 

 pedicle grows out, at the end of which a little knob appears with some cells; this knob increases 

 in size and becomes vesicular. Very seldom, and then mostly in the posterior region of the 

 body, a papilla occurs opening externally. The papillae may grow so large, that they rise as 

 little round protuberances above the surface of the cuticula ; even then they clo not burst open, 

 but remain closed. 



The ventral groove runs as far as the cloaca. The ventral fold represents one large 

 fold, on either side of which another very small one is found. The "Flimmerhöhle" is spacious 



