52 
THE VOYAGE OF H.M.S. CHALLENGER. 
It will be seen at a glance that the Families of the German arrangement are much 
smaller and more numerous than those adopted by the English naturalists ; this, how- 
ever, is subsequently counterbalanced by the more comprehensive “ generic types ” of 
the latter. The essential difference, not only between the two systems of classification, 
but in the entire methods of study and nomenclature, is to be found in the different values 
of their respective Genera and Species. 
Before entering upon any extended criticism, it may be well to introduce briefly 
certain other plans for the systematic arrangement of the Foraminifera, which have 
appeared more recently, and which differ in many noteworthy respects from either of the 
foregoing. Precedence must be given to the synopses published almost simultaneously 
by Professor T. Rupert Jones 1 and Professor Carl Zittel 2 respectively, the general 
features of which will, as in the former case, be best understood from collatera] 
tabular summaries. 
Rupert Jones, 1876. 
Zittel, 1876. 
Sub-order I. Imperforata vel Porcellana. 
Family I. Nubecularida. 
II. Miliolida. 
III. Peneroplida. 
IV. Orbiculinida. 
V. Dactyloporida. 
Sub-order II. Arenacea. 
Family I. Parkeriada. 
II. Lituolida. 
Sub-order I. Imperforata. 
Family I. Gromida. 
II. Cornuspiriue. 
III. Miliolida. 
IV. DaCTYLOPORIDjE. 
Sub-order III. Perforata vel Hyalina. 
Family I. Lagenida. 
II. POLYMORPHINIDA. 
III. Buliminida. 
IV. Textularida. 
V. Globigerinida. 
(1) Globigerinina. 
(2) Rotalina. 
(3) Polystomellina. 
(4) Nummulinina. 
Sub-order II. Perforata. 
Family I. Lagenida:. 
II. Globigerinida:. 
(1) Globig evince. 
(2) Textularince. 
(3) Rotalince. 
III. NuMMULINIDiE. 
Two other outlines of classification, more carefully elaborated than any which 
preceded them, remain to be noticed, namely those of Dr. Schwager 3 and Pro- 
i 
1 Monthly Micr. Journ. No. 86, Feb. 1876, pp. 89-92. 
2 Handbucb der Palaontologie, vol. i. pt. 1, 1876, pp. 61-106. 
3 Saggio di una Classificazione dei Foraminiferi, avuto riguardo alle loro famiglie naturali, per Corrado Schwager. 
Bollet. r. Com. Geologico, 1876-1877. 
