96 L. F. Pourtales on Orbulina and Globigerina. 
Art. XIV.—On the genera Orbulina and Globigerina of ae 
d’ Orbigny ; by L. F. PourTALEs. 
HirueErto the two genera of Foraminifera established under 
the names of Orbulina and Globigerina by d’Orbigny had been 
widely separated in the classification; he had even put them in 
different orders, although he had remarked the similarity in the 
structure of the shell. Ehrenberg also places them in different 
families (the former under the name of Jfliola), but marks the 
two genera of Miliola and Gromia as doubtful, and appends to ! 
the characteristics of the family of Meholina the query, ‘‘An sia- - 
tus heh reaiquorum?” M.S. Schultze makes of Orbulina a | 
family among his Monothalamia, whilst Globigerina is included 
in a 5 sly of the family of Turbinoida among the Polytha- 
these two pear — are only different ¢ stages in the cyeli- 
cal or alternate generation of meric € species. ion had an 
ity 0 rved 
slender spiculw. Only one Globigerina is developed in an Orbu- 
whose cavity it gradually fills up, and whose shell it finally 
bursts to make its escape. At that time the Globigerina has 
already nearly attained its full size, and I have counted as many 
as sixteen cells in a specimen having yet room for several more 
before filling up the parent Orbulina. 
How the Orbulina-form is reproduced I have nop yet traced 
out. None were oe of very small size among those exam- 
“ined. Large indivi are uently found containing a 
| emailer one filling bas cavity eee 5 the old shell coefinsiy 
cast off, and appears to rema hed in fragments to the 
: ea some time. Lam unable to say as yet wi 
to be as an act of reproduction, or merely asa 
of the e shell. - Tt is not rare to find Orbulinze with this 
ei + the above facts have a parol 
pe Peat once-comm unicated. : : 
