432 Mr. H. B. Brady on the Reticularia and 
types, e.g. Rhabdammina, Pilulina, most of the various forms 
described as Lituole by Dr. Carpenter, and Astrorhiza cate- 
nata, Norman. In addition to these, Cristellaria obvelata, 
Reuss, Orbulina neojurensis, Karrer, and the dwarf variety 
of Globigerina bulloides, alluded to on a later page of the 
present paper, were also found. 
To turn now to the more strictly zoological portion of the 
subject. An examination of the accompanying Distribution- 
Table, still more the inspection of the mounted specimens, 
brings into relief certain characteristics of the Polar foramini- 
feral fauna. Some remarks will presently be made on the 
individual species where they exhibit any special or note- 
worthy features ; but attention may be drawn at the outset to 
one or two facts of more general import. There are about 
half a dozen species that may be regarded as essential con- 
stituents of the microzoic fauna of these high latitudes, having 
been found at almost every depth at which the floor of the 
sea has been examined. They are as follows—Globigerina 
bulloides (a dwarf variety), Cassidulina levigata and C. 
crassa, Truncatulina lobatula, Pulvinulina Karsteni, and Poly- 
stomella striatopunctata. 'They are usually accompanied by 
one or two forms of Nonionina, varying according to depth 
and other circumstances, and, if the sea-bottom be composed 
of rough sand or gravel, by Polystomella arctica. Other species 
occur in every sample of mud or sand wherever obtained ; but 
it is not too much to say that those above enumerated consti- 
tute ninety-five per cent. of the entire collection made from 
these soundings. The constant occurrence of Casstdulina 
levigata, of full size and well-grown, even when the other 
Foraminifera accompanying it were poor, starved specimens, 
and the presence of Pulvinulina Karsteni in almost every 
dredging to the practical exclusion of all other species of the 
same genus, are points of considerable significance. The 
almost complete absence of the Milioline genera (for the oc- 
currence of a single, minute, thin-shelled specimen here and 
there in a few of the soundings amounts to absence in such a 
case) is an unexpected feature. In dredgings at similar 
depths but little to the south of those under consideration the 
simple porcellanous forms are comparatively common; and 
their area of distribution is otherwise world-wide; yet it is 
hardly too much to say that no approach to a full-sized mature 
specimen of any of the modifications of the Milioline type has 
been met with in the North-Polar material. ; 
One or two of the species are undescribed hitherto; anda 
few others present characters somewhat modified by their 
