172 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



simple and continuous, showing no trace of segmen- 

 tation. It cannot be confused with any other 

 species, its nearest allied form being Hyperammina 

 friabilis,* the resemblance being confined to the ex- 

 ternal appearance of the base. The test altogether 

 is much thinner, and the mineral particles are firmly 

 cemented closely together. 



A notable feature in this species is its selection of 

 material for strengthening its test — i.e., in coating 

 the chitinous envelope with mineral particles of a 

 nearly uniform size, having a mean diameter of 004 

 mm., chiefly composed of quartz grains, and after- 

 wards, evidently for ornament, adding numerous 

 Globigerince, Uvigerince, etc. Owing to the chitinous 

 lining the test is somewhat flexible, and may be 

 freely handled. 



Dr. H. B. Brady, to whom this species was sub- 

 mitted for inspection, says that the most interesting 

 feature is the branched arborescent distal extremity. 

 The question one has to determine is whether the 

 forms we know best by their wasted and dried tests 

 were, when living, in the same condition. I quite 

 agree with Dr. Brady on this point, and think it is 

 just possible that further investigations on the deep- 

 sea Foraminifera may prove Hyperammina palmi- 

 formis to be only a perfect form of Hyperammina 

 friabilis, or an allied form. Should this turn out 

 to be so, the specific name friabilis will take 

 precedence. 



Hyperammina palmiformis was obtained, with 

 others, in the Warm Area, Station 10, lat. 59° 40' 

 N., long. 7° 21' W. ; surface temperature, 55° *5' F. ; 

 bottom temperature, 4G°*5' F. ; depth, 510 fathoms. 



The deposit in which this interesting species was 

 obtained is a grey, sandy, calcareous mud, homo- 

 geneous, earthy, and having a greenish tinge when 

 wet. 



* II. B. Brady. "On the Foraminifera dredged by H.M.S. 

 Challenger, 1873-1876," Zool. Chall. Exp., part xxii., p. 258, pi. 

 23, figs. 1, 2, .**, 5, and 0, 1881. 



