88 HENRY B. BRADY. 
Rurert JONEs. 
Sub-order I. Imprrrorata vel 
PoRCELLANA. 
Family I. Nubecularida. 
Il. Miliolida. 
Ill. Peneroplida. 
IV. Orbiculinida. 
V. Dactyloporida. 
Sub-order II. ARENACEA. 
Family I. Parkeriada. 
Il. Lituolida. 
Sub-order III. Perrorata vel 
HYALINA. 
Family I. Lagenida. 
Il. Polymorphinida. 
IIL. Buliminida. 
IV. Textularida. 
V. Globigerinida. 
ZITTEL. 
—_—— 
Sub-order I. ImpERFORATA, 
Family I. Gromide. 
Il. Cornuspiride. 
Ill. Miliolide. 
LV. Dactyloporide. 
Sub-order II. Perrorata. 
Family I. Lagenide. 
Il. Globigerinide. 
(1) Globigerine. 
(2) Textularine. 
(3) Rotaline. 
(1) Globigerinina. et A 
(2) Rotalina. 
(3) Polystomellina. 
(4) Nummulinina. 
The primary division of Foraminifera into Perforata and 
Imperforata would be very convenient if it could be em- 
ployed in its original sense ; but it is now well known that 
some, though perhaps not a large proportion, of the arena- 
ceous types, have interstitial openings amongst the sand- 
grains of which the test is built, in addition to the general 
aperture: that others, like Psammosphera and Sorosphera, 
have no general aperture, but only interstitial orifices ; 
whilst a few, Thurammina, for example, have numerous 
small mammillate orifices, irregularly disposed over the 
surface of the test, either with or without a general aper- 
ture. If the arenaceous group be removed from the Jmper- 
forata there remain but the chitinous and porcellanous 
forms. Rupert Jones follows Von Reuss in making 
a distinct sub-order of the Arenacea, and, as he entirely omits 
the chitinous group, his sub-order Imperforata is exactly 
co-extensive with Dr. Carpenter’s family Miliolida. Professor 
Zittel, on the other hand, only admits arenaceous structure 
as a character of secondary importance, and distributes the 
sandy forms amongst the porcellanous, so that types as 
diverse as Saccammina and Cornuspira, or as Miliola and 
Botellina, are found in the same family. 
That the Porcellanea are, under all circumstances, imper- 
