832 
THE VOYAGE OF H.M.S. CHALLENGES. 
Lesson in his Voyage cle la ‘ Coquille’ as a Mollusc , 1 and captured in great abundance 
between the Moluccas and New Guinea, was another species of Pelcigonemertes. The 
genus appearing thus to have a wide distribution, and often to occur in considerable 
numbers, we may look forward with interest to further specimens being captured and more 
closely investigated by naturalists residing in that part of the world. 
Fig. 
302 . — Pelagonemerles rollestoni, Moseley, enlarged, viewed from the dorsal surface ; 
the proboscis is partly extruded. 
P, proboscis ; PrS, sac of proboscis ; IP, invaginated portion of proboscis within the proboscis-sac ; G, superior nerve- 
ganglion ; NC, nerve-cords ; V, vascular trunk (the upper V points to an enlargement of the vessel lying just 
posteriorly to the superior nerve-ganglion); I, intestine; D, diverticula of intestine; 0,0. ovaries; CM, circular 
muscles ; LM, longitudinal muscles. 
“ In looking at the map for the Stations where Nemertea, with the exception of Pelci- 
gonemerteSj were taken by the Challenger, it immediately strikes one that they are all in 
close proximity to the land. Not one Nemertine was taken at any of the numerous Stations 
in the open ocean. Even the deep-sea forms above alluded to were found at a compara- 
1 Lesson, M., Voyage de la “ Coquille,” Zoologie, p. 254, pi. iii. fig. 3, Paris, 1830. 
