438 Mr. H. B. Brady on the Reticularia and 
fessor has been kind enough to examine the mountings; and his 
remarks upon them contain much of interest. He states that 
the species are, as far as they go, exactly identical with those 
he finds in the ‘ Challenger’ soundings from the Stations 
numbered 268 to 274 in Sir Wyville Thomson’s printed 
list—that is to say, with the particular species which are 
found at the sea-bottom in the middle of the Pacific, from 
about 8° N. of the equator to 8° 8. of the same, at depths of 
2400 to 2900 fathoms. Prof. Haeckel confirms the view 
which I had already arrived at, that, until we have the wider 
basis for accurate nomenclature which the publication of 
the ‘ Challenger’ Radiolaria will afford, it is better to give 
nothing more than an enumeration of the genera observed. 
There has been no previous record of Arctic Radiolaria, 
except in the tabular statements which accompany the Rev. 
A.M. Norman’s paper (op. cit. xxv. pp. 204, 205). In these 
Tables eight species of Polycystina are set down as occurring 
on the west coast of Greenland and in Davis Straits; but I 
gather from the author that the entry is only intended to 
convey the fact of this number of distinct forms being ob- 
served, and that no determination of genera or species was 
attempted. 
The following notes represent the distribution of the group 
so far as revealed by the polar soundings :— 
AA. Off Cape Dudley Digges, July 26, 1875, 260 fathoms, 
lat roe 
This sounding is from a point in Baftin’s Bay somewhat 
south of the rest. The material contained no Foraminifera 
worth recording ; and therefore the locality was not included 
in the Table. The Radiolaria were few in number, and be- 
longed to the genera Spongodiscus and Spongotrochus. 
B. Off Cape Isabella, 220 fathoms, lat. 78° 20' N. 
Contained more than one species of Spongotrochus. 
F. Between Walrus Shoal and Victoria Head, Sept. 8, 1876, 
57 fathoms, lat. 79° 26’ N. 
Five genera of Radiolaria represented, viz. Haliomma, 
Tetrapyle, Heliodiscus, Spongaster, and Euchitonia. 
J and K. Dobbin Bay, 47 fathoms and 113 fathoms, lat. 
79° 35’ N. 
The only genera noticed were 7rematodiscus and Spongo- 
trochus. 
X. Sounding, May 11, 1876, 72 fathoms, lat. 83° 19! N. 
The most northerly point attained. The little tube full of 
