NOTES ON RETICULARIAN RHIZOPODA, 65 
and rounded. Uvigerine chambers few, distinct ; those 
of the linear series numerous, short, not inflated. 
Sutures flush externally; septa thickened by deposit of 
clear shell substance. Aperture large, oval, surrounded 
by a sessile lip. Length ;'; inch (0°84 mm.). 
Discorspina, Parker & Jones. 
Discorbina tabernacularis, nov.—Test conical or tent-shaped, 
sides somewhat arched, inferior surface concave. Seg- 
ments long, oblique, arranged in about three convolu- 
tions ; septal lines externally limbate in small speci- 
mens, in larger ones hidden by the general thickening 
of the shell-wall. Inferior surface ornamented with 
radiating striz or crenulations ; superior with striz or 
irregular coste radiating from the apex. Diameter, 
ty Inch (0°25 mm.). 
In some localities specimens of D. tabernacularis are met 
with in pairs, that is to say, two shells firmly attached 
by their bases. The same condition is not unfrequent in 
Discorbina pileolus, d’Orb., and D. Parisiensis, d’Orb. 
TruncatuLtina d’Orbigny. 
Truncatulina rostrata, nov.—Test biconvex, subnautiloid, 
slightly unsymmetrical; periphery thin, subcarinate. 
Chambers equitant; about ten in the final convolution, 
which completely encloses the penultimate. Sutures 
limbate, especially near the centre; marked by inden- 
tations at the periphery. The true aperture is an 
arched, labiate opening, placed transversely on the face 
of the terminal segment, close to the margin of the 
previous convolution ; but there is usually, in addition, 
a second or spurious orifice, in the form of a vertical 
slit in the beak-like projection of the peripheral angle 
of the same. Diameter, =; inch (0°84 mm.). 
Tr. Robertsoniana, nov.—Shell spiral, lenticular; superior 
surface slightly convex; inferior convex, somewhat 
depressed at the umbilicus; consists of four or more 
convolutions, of which the whole are visible on the 
superior face, whilst on the inferior the last whorl 
conceals all preceding it, except a small area in the 
centre. Segments very numerous, 13 or 14 in the 
final convolution. Periphery angular, even, not con- 
stricted at the sutures. Colour, rich brown, deepest 
near the centre and at the sutural lines. Diameter, 
3 inch (0°7 mm.). 
VOL, XXI,—NEW SER. 
