NARRATIVE OF THE CRUISE. 
831 
a few millimetres in length. The accompanying woodcuts (figs. 300 and 301) repre- 
sent these fragments, about four times enlarged ; these figures have very few 
points of interest, giving only the general 
shape together with the rounded anterior por- 
tion of the body, and the openings of the mouth 
and the proboscis, but there is sufficient reason 
for their insertion in this place, since they bring 
vividly before the mind of collectors of marine 
zoological specimens the desirability of care- 
fully preserving even the smallest and most 
unpromising fragments that come up in the 
dredge. As in this case it may often prove 
possible to distinguish such fragments, speci- 
fically and generic ally, and to obtain most valuable anatomical information by cutting 
them up into sections. 
“ Nemertines were obtained at more than twenty different Stations, some of them 
yielding more than one species. The most striking capture was that of the beautiful 
pelagic species ( Pelagonemertes rollestoni), already so carefully described by Mr. Moseley 1 
shortly after he had discovered and examined the specimens in the fresh state. They 
were taken on two occasions; one, an apparently adult specimen, near the southern 
verge of the South Australian Current, the other off Japan. This animal is most beauti- 
fully transparent, the different internal organs standing out very clearly, especially 
the digestive system, which is of a deep burnt-sienna colour. The lateral cseca of 
the intestine are branched in the adult. The lateral nerve-cords are united by a 
commissure which is situated above the posterior part of the rectum, the mouth being 
also situated below the brain. Mr. Moseley suggests that the animal, although essentially 
pelagic in all its characters, occurs only in deep water, and does not often come to the 
surface. 
“ The woodcut (fig. 302) is taken from Mr. Moseley’s figure, representing the young 
specimen, which was better preserved when captured, but which has since perished. 
The larger specimen, although incomplete, has been preserved in spirit, and will allow 
of being cut into sections. In this way it may be possible to decide whether I am right 
in supposing that although Mr. Moseley found the proboscis to be unarmed, it must 
nevertheless find its place in that group of Nemertea in which the more specialized 
genera, those having an armature in the proboscis, are arranged. Its position there 
would not be altogether exceptional, the parasitic Malacobtlella probably finding its 
place there also, although in this genus the proboscis is unarmed as in Pelagonemertes. 
“ Mr. Moseley has little doubt that the Pterosoma plana, described and figured by 
1 Ann. and Mag. Nat. Hist., ser. 4, vol. xv. pp. 165-168, pi. xv., 1875; Ibid., vul. xvi. pp. 377-383, pi. xi., 1875. 
(narr. chall. exp. —vol. x. — 1885 .) 105 
tr 
Figs. 300, 301. — Carinina, n. geu. ; four times the natural 
size, o, mouth ; pr, opening for the proboscis : tr, 
shallow transverse furrow, strongly ciliated. 
