Radiolaria of the Arctic Expedition, 1875-76. 483 
boreal habitat. The following notes refer to some of these ; 
the numbers prefixed correspond with those employed in the 
Table. The new forms and the more interesting varieties 
are figured in Plates XX. and XXI.; for the rest, nearly all 
the species are well illustrated in Messrs. Parker and Jones’s 
memoir before referred to, or in Prof. Williamson’s ‘ Recent 
Foraminifera of Great Britain.’ 
9. Lituola glomerata, nov. (Pl. XX. fig. 1, a-c.) 
Characters. 'Test free, arenaceous, thin-walled, non-laby- 
rinthic; spiral in arrangement, subglobular in form, often some- 
what lengthened in the direction of the axis; usually more 
or less unsymmetrical. Segments few, three orfour in each con- 
volution, long, narrow. Sutures but little excavated except at 
the ends. Aperture at the inner margin of the terminal cham- 
ber, uear the exterior of the corresponding segment of the 
previous convolution, simple, often obscure. Diameter of the 
test seldom more than ;4,5 inch (0°25 milliin.). 
This, which is perhaps the most minute of the segmented 
Lituolida, is an obscure and difficult form to treat. The sep- 
tation is often imperfect and sometimes cannot be traced on 
the exterior. The drawings (Pl. XX. fig. 1, a—c) are from 
unusually good specimens, and they are sufficiently character- 
istic. When the Lituoline genera come to be rearranged in 
the light of the material which now exists for their more ex- 
tended and accurate study, it is possible that this, in common 
with some other of our northern species, may find its place in 
Reuss’s genus Haplophragmium ; but its nearest allies are 
forms best recognized at present under the generic term 
Lituola. In distribution Lituola glomerata is by no means 
contined to the arctic seas, but has been met with in the 
‘Challenger’ dredgings from many parts of the world. 
10. Hyperammina elongata, nov. gen. et sp. 
(Pl. XX, fie. 2.0.5.) 
Characters. Test arenaceous, in the form of a straight or 
nearly straight tapering tube, the wide end closed and rounded, 
the open narrow end constituting the general aperture. Ex- 
terior sandy and rough, interior smooth. Length (of the 
Arctic specimens) about =), inch (2°5 millims.). 
This is one of the many arenaceous types brought home in 
1869 by the naturalists in charge of the first cruise of the 
‘Porcupine ;’ but it has not hitherto, so far as I am aware, 
received a name. Its club-like or, still more, its pestle- 
like contour and sandy texture, suggest the term Hyperam- 
