a new Genus of Foraminifera. : 337 
- “Such being the structure of the calcareous shell, it may 
easily be seen that the chambers, besides being of uniform 
shape, are so arranged that their axes are in a right line, each 
chamber being altogether closed and fixed at both extremities 
of its longer axis. It is therefore evident that this Foraminifer 
belongs to D’Orbigny’s order Stichostégues. Further, it be- 
comes the type of a well-defined genus, approaching in its 
structure the Glanduline and Nodosarie, but showing the 
successive chambers completely enveloping each other, whilst 
in the Glanduline they appear in part projecting to the ex- 
terior, and in Nodosaria they are placed one on the top of the 
other, overlapping each other but little, if at all. This will 
show clearly how well-defined is the new genus, which I name 
oe molaey and that it is related to Nodosaria through Glan- 
dulina. 
“By minute study of these microscopic shells, I succeeded 
in distinguishing three specific forms belonging to the genus in 
question ; and after I have recapitulated the generic characters, 
shall describe the species. 
“T was led to adopt the name Ellipsoidina in order to pre- 
serve the generic terminology of the class, inasmuch as almost 
all authors who have written on the subject, and especially 
_ D’Orbigny, have derived the chief portion of their generic 
terms from resemblances in external form: hence the name 
given, referring to the nearly elliptical contour of the shell, is 
consistent with common usage. 
Characters of the Genus. 
EXLLIPSOIDINA, mihi, 
“Shell free, regular, ovato-ellipsoidal, vitreous in texture, 
terminated at one extremity by.a tube, which is closed at the 
‘base where it ths the shell. In the interior are a series of 
chambers similar to the external one, decreasing in size, which 
successively completely envelop each other, each attaching 
itself to the base of that which immediately encloses it, and 
fixing itself to the apex of the same by means of the extremity 
of the tube. 
“ Relations and Differences.—This genus, as I have alread 
remarked, is closely allied to @landulina, but it has sufficiently 
distinct characters. The most remarkable fact is that, although 
Ellipsoidina is multilocular, and hence very distinct from the 
order Monostegia, still it is impossible, from exterior appear- 
ance, to distinguish it from Oolina, so.much do they resemble 
each other externally ; indeed the form of the shell, the absence 
of pores, the elongation of the anterior portion into a tube, the 
