Radiolaria of the Arctic Hxpedition, 1875-76. 439 
mud which was secured yielded species of the following 
genera—Dictyopodium, Haliomma, Tetrapyle, Heliodiscus, 
Actinomma, Spongotrochus, Spongaster, and Huchitonia. 
Thus in all there are ten genera of Radiolaria, eight of 
which exist in the highest latitudes that have yet been 
reached. 

We are now in a position to inquire what actual service to 
biological science, or rather to that small section of it which 
has been considered in the foregoing pages, has been rendered 
by the North-Polar Expedition of 1875-76. 
Nothing need be added to what has already been said 
about the Radiolaria. With respect to the Foraminifera it 
has been seen that previous researches had rendered account 
of the Arctic fauna as far north as lat. 76° 30'—that is, to 
within 13° 30' of the North Pole. To this record we are 
now able to add three further instalments, namely, the group 
of soundings in Smith Sound and the north of Baffin’s 
Bay, a single one in Hall Basin, and, lastly, a series to the 
north of Robeson Channel. These extend our knowledge of 
the sea-bottom to lat. 83°19! N., a distance of 6° 49'—in 
other words, over more than half the interval between the 
most northerly: point of previous researches and the actual 
North Pole. From a zoological point of view the result is not 
less gratifying. Sir KE. Parry’s soundings in Baffin’s Bay, 
which, taken together, furnish the northernmost section of 
Messrs. Parker and Jones’s Table, yielded seventeen species 
of Foraminifera. All but three of these have been found in 
the material brought by Captain Feilden ; but they form only 
a small part of the catalogue of fifty-three species which appear 
inour Table. Setting aside the Norwegian lists given by the 
same authors, as representing a fauna more or less influenced 
by the warm current of the Gulf-stream, the Hunde-Island 
and Baffin’s-Bay columns give an aggregate of fifty-five 
species, or only two in excess of the total now recorded. 
The facts which have been elicited therefore appear to indi- 
cate that there is no very striking diminution in the number 
and variety of the Rhizopoda as we approach the North Pole. 
EXPLANATION OF THE PLATES. 
PLATE XX. 
Fig. 1. Lituola glomerata, n. sp., magnified 100 diam. :; a and 6, periphero- 
lateral aspect, front and back; ¢, end view. 
Fig. 2, a, b. Hyperammina elongata, n. gen. et sp., magn. 40 diam. 
Fig. 3. Lagena striatopunctata, Parker & Jones, magn. 75 diam. 
