NOTES ON RETICULARIAN RAILZOPODA. oF 
about six inflated segments, often irregular in shape 
and disposition. Shell texture thin, resembling that 
of H. canariense. Diameter, =; inch (0°34 mm.). 
PxacopsiLina, d’Orbigny. 
There is, in addition, one simple adherent Lituoline 
species resembling in form the Sguamulina of Max Schultze, 
but arenaceous instead of porcellanous in texture. 
Placopsilina bulla, nov.—Test adherent; highly convex or 
approximately hemispherical but slightly longer in one 
diameter than the other; with a simple, rounded, 
pouting aperture at each ‘end, close to the base. Walls 
thick, somewhat loosely sandy. Diameter, ~; inch 
(0°75 mm.). 
Ammopiscus, Reuss. 
Of the free non-septate Trochammine only two forms 
require present notice; both are somewhat remarkable for 
their size. 
Ammodiscus tenuis, nov.,is a large, thin, planospiral variety, 
consisting of a few broad, somewhat overlapping, con- 
volutions. It bears the same relation to A. encerta that 
Cornuspira foliacea bears to C. involvens. Diameter, 
sometimes + inch (3° mm.). 
A. spectabilis, nov.—By far the largest species of the non- 
septate group, is composed of a tube wound upon itself, 
not regularly and symmetrically so as to retain a rec- 
tilimear shape (like A. Shoneanus), but in curved or 
twisted fashion, so as to form an arcuate or subhelicoid 
test. The shell-wall is very thin, the exterior some- 
what rougher than usual amongst the Trochammine, 
the interior smooth and polished. Diameter, + to + 
inch (5° to 6° mm.). 
Hormosina, Brady. 
The following are representatives of the uniserial or 
moniliform section of the genus: 
Hormosina Carpenter, nov.—A fine species figured by Dr. 
Carpenter in his treatise on the‘ Microscope’ (5th ed., 
1875, p. 531, fig. f), under the general name “ Monili- 
form Lituola,” pretty common in deep water in the 
North Atlantic and elsewhere. It consists of numerous, 
elongate, pyriform segments, increasing but slightly in 
size as they succeed each other ; connected end to end in 
a curved or crooked, never (as a rule) ina straight line. 
