REPORT ON THE FORAMINIFERA. 
107 
most part of the North Atlantic or sub-arctic colcl-area type, but with very 
few arenaceous species. Globigerina, Pulvinulina, Truncatulina, Pullenia, 
Uvigerina , and Textularici, furnish almost the entire fauna. A few examples 
of Rupertia stabilis and Cassidulina crassa, and a single specimen of 
Ehrenbergina serrata were noted. 
Station 321. — February 25, 1876. Lat. 35° 2' S., long. 55° 15' W.; mouth of the 
Rio de la Plata. Depth, 13 fathoms ; mud. 
Fine black mud, leaving scarcely any residue after washing, and revealing a 
Rhizopod-fauna of brackish or estuarine character. Foraminifera not 
numerous, the calcareous species thin-shelled. The following are the 
prominent forms : — various Miliolce, Polystomella stricitopunctata, Nonionina 
turgida, and Haplopliragmium cananense. 
Station 322. — February 26, 1876. Lat. 35° 20' S., long. 53° 42' W. About 60 
miles E.S.E. of Lobos Island. Depth, 21 fathoms ; shells. 
Some mud with broken shells from this Station was carefully examined, in 
the hope that it would yield brackish-water organisms, but it appeared to 
contain few organic remains, and no Foraminifera whatever. 
Station 323. — February 28, 1876. Lat. 35° 39' S., long. 50° 47' W. Depth, 1900 
fathoms ; bottom temperature, 0 o, 0 C. ; grey mud. 
The dredged material consisted of very fine, dark-coloured mud, the residue 
of which, after washing, was almost entirely composed of arenaceous Rhizo- 
poda, pertaining to the following genera : — Rhabdcimmina, Hyperammina, 
Ascliemonella, Psammosphcera, Reophax, Haplopliragmium , Placopsilina, 
Cyclammina, Ammodiscus, Hormosina, Webbina, and Thurammina. Of 
these the more interesting species were Haplopliragmium foliaceum and 
Haplopliragmium tenuimargo, Reophax guttifera and Reophax distans, 
Hormosina ovicula, Rhabdammina linearis, and two dwarf modifications of 
Cyclammina. 
Station 324 A. — February 29, 1876. Lat. 36° 9' S., long. 48° 22' W. Sounding ; 
depth, 2840 fathoms ; bottom temperature, 0°’4 C. ; grey mud. 
Fine mud, which left scarcely any residue for examination after washing ; 
containing a very few arenaceous Foraminifera, with abundance of Radiolaria. 
Station 328. — March 6, 1876. Lat. 37° 38' S., long. 39° 36' W. Sounding; depth, 
2900 fathoms ; bottom temperature, 0°‘3 C. ; grey mud. 
Very similar to the foregoing. The washed residue contained plenty of 
Radiolaria, but only one or two arenaceous Foraminifera. 
