Mr. A. Adams on the Animal and Affinities of Fenella. 39. 
granular protoplasm of even the largest tentacula); e represents 
a portion of the parenchyma which appears to protrude after 
rupture of a contracting vesicle (thus apparently showing that 
the fluid contents of this organ are expelled externally); f, f, ve- 
sicula or contracting vesicles; g, nucleus? h, bodies like the 
‘reproductive cells ;”’ 7, portions of food in process of digestion, 
among which is a rotiferous animalcule ; k, a tentaculum, trun- 
cated in the drawing only. N.B. The body has not been filled 
up with the vacuolar parenchyma, nor have the actiniform tenta- 
cula been scattered over it, as in nature, to save trouble in the 
drawing, &e. ; 
Fig. 22. The same, magnified small specimen of (?), with the actiniform 
tentacula bearing little pellets of the investing membrane (?). 
Fig. 23. The same; another specimen (?), where the investing membrane 
is carried out by the tentacula into an arachnoid form; the body 
presenting the nucleus and a portion of crude food. 
Fig. 24. The same; another specimen (?), where the investing membrane 
has not only been carried out into an arachnoid form, but appa- 
rently has also assumed a hastate form at the ends of the tenta- 
cula respectively. 
Figs. 22-24 are drawn upon no scale, but in body may be set down 
as about =3,th or ;3;th of an inch in diameter respectively. 
Fig. 25. Acanthocystis turfacea, un. sp. et gen., magnified; on the scale of 
xrth to sZocth of aninch: a, body; 4, minute, curved, fusiform 
spicules covering the capsule; ¢, c,c, forked spines; d, d, d, ten- 
tacula, granuliferous; e, nucleus; f, vesicula discharging itself ; 
g, chlorophyll-cells ; h, starcl-granules; 7, a spine, more magni- 
fied ; k, proximal or discoid end ; /, distal or forked end; m, more 
magnified representation of a fusiform spicule. 
IV.—On the Animal and Affinities of Fenella; with a List of 
the Species found in the Seas of Japan. By Artuur Apams, 
F.L.S. &c. 
Iw the ‘Annals’ for 1860 I described some exquisitely sculp- 
tured little shells under the common appellation of Dunkeria, a 
form of Pyramidellidee separated by P. P. Carpenter from Tur- 
bonilla on account of their convex whorls. At Takano-Sima, on 
the Hast coast of Niphon, I afterwards discovered the animal of 
my genus Fenella (by mistake printed Finella in the ‘ Annals’ 
for 1860), and found it to possess all the characters of a Rissoid. 
A comparison of my Dunkerie and Fenella pupoides has con- 
vinced me that they all belong to the same Rissoid group. 
The species I examined was the original type, Fenella pupordes, 
A. Ad. It occurred in tolerable abundance on a sandy-mud 
bottom, in 2 fathoms water, at Takano-Sima. The head is broad, 
dilated, and flattened ; the muzzle large, long, annular, and of a 
pale brown colour, edged with white. The tentacles are small, 
filiform, wide apart, and of an opake-white colour. The eyes 
are small, black, and sessile, in the centre of white spaces on the 
sides of the head, behind the bases of the tentacles. The foot is 
