136 MR F. GORDON PEARCEY ON 



This species in its earlier stages of development closely resembles Cyclammina 

 pusilla, and this resemblance can be seen when the later convolutions are broken away, 

 leaving the earlier chambers exposed (Plate II. tig. 7). All the specimens I have 

 examined are of the microspheric form. 



Obtained at Stations 417 and 420, but not abundant. 



Genus AMMOBACDLITES, Cushman. 

 Ammobaculites (Haplophragmium) agglutmans (d'Orbigny). 



This, perhaps the most common species of all arenaceous Foraminifera, was obtained 

 from Stations 337a, 338, 342, 447, 459, and 467, but nowhere very abundantly. Its 

 distribution is world-wide, and its range of depth from quite shallow water down to over 

 3000 fathoms. 



Ammobaculites americanus, Cushman. 



From Station 342 only (rare). BRADY records this species, under the name of 

 IlapIopJt ragmium fontinense, from the South Atlantic, 1900 fathoms; from the South 

 Pacific, 1375 fathoms; and amongst the islands off the coast of Patagonia, 40 to 140 

 fathoms. CUSHMAN also records it from the Mexican coast, 772 fathoms. 



Ammobaculites (Haplophragmium) tenuimargo (H. B. Brady). 

 This interesting species was taken (rare) at two stations, 313 and 420. It is a rare 

 form ; only six other localities, very wide apart, are known where this species has been 

 obtained : in the Faroe Channel, warm area, 530 fathoms ; south-west of the Canaries, in 

 2740 fathoms; east of Buenos Aires, 1900 fathoms; north of Papua, 1070 fathoms; 

 east of New Zealand, 1100 fathoms; and at one station in the North Pacific, 3950 

 fathoms. 



Genus PLACOPSILINA, d'Orbigny. 



Placop>silina vesicularis, H. B. Brady. 



Obtained (rare) at one station only, 420, 2620 fathoms, attached to rock-fragments. 

 This species, which is generally associated with a rich arenaceous fauna, has hitherto 

 been taken in the Faroe Channel, 560 fathoms; between the north-west of Ireland 

 and the Rockall Bank, 630 to 1443 fathoms; from the South Atlantic east of Buenos 

 Aires, 1900 fathoms. These are the only localities known; it is therefore worthy of 

 note that this species has been found in the Weddell Sea. 



Genus TROCHAMMINA, Parker and Jones. 



Trochammina (Haplophragmium} nana (H. B. Brady). 



Taken at two Scotia stations, 118 and 337a (rare). This minute species appears to 

 be at home either in deep or shallow water ; it has a wide distribution. In the Arctic 



(ROY. soc. KDIN. TRANS., VOL. xux., 1010.) 



