RHABDAMMININAE 333 



a general resemblance in size and in the fusiform shape of the proloculum. It is possible 

 that our Falkland form represents merely a variety of H. laevigata possessing selective 

 powers. 



The only organism with which we are acquainted in any way resembling H. clavigera 

 is H. calcilega, Rhumbler (1906, FLC, p. 24, pi. ii, figs, i, 2 — Saccorhiza calcilega 

 (Rhumbler), C. 1910, etc., FNP, 1910, p. 66, figs, after Rhumbler) from Laysan in the 

 Pacific Ocean. Rhumbler 's species, however, has a bulbous proloculum and the tube 

 coated with projecting sponge spicules, thereby indicating its affinity with H. ramosa, 

 Brady. It difl^ers much in appearance from the neatly finished Falkland species. 



75. Hyperamminanovae-zealandiae, Heron-Allen and Earland (Plate VIII, figs. 10, 11). 



TcchnitcUa mestayeri, Cushman, 1919, RFNZ, p. 595, pi. 74, fig. 4. 



Hypcrommina novae-zealandiae, Heron-Allen and Earland, 1922, TN, p. 89, pi. iii, figs. 1-5. 



Two stations: WS 225, 246. 



At WS 225 which is on the Continental Shelf to the north-west of the Falkland 

 Islands and at WS 246, which is just oft' the Continental Shelf to the south, a number of 

 specimens, mostly broken, were obtained of this interesting form. Among the frag- 

 ments, both megalo- and microspheric forms occur, and the shell structure is charac- 

 terized by the same selective powers as described by us ut supra. The test is almost 

 entirely constructed of spicules in a double layer. The Falkland specimens must have 

 been very much larger than those from New Zealand, as several fragments of the micro- 

 spheric form attain the maximum size observed there, and one fragment is over 10 mm. 

 in length. The absence of the species from the other gatherings is rather noteworthy. 



76. Hyperammina malovensis, sp.n. (Plate VIII, figs. 12-14). 

 One station: WS 88. 



Test consisting of a slightly curved unseptate tube, with thin walls neatly built of very 

 fine grey sand, in which much larger mineral grains are incorporated irregularly, but so 

 as to preserve the smooth exterior of the tube. The walls being so thin, these larger 

 sand grains project into the interior of the tube which is rough and irregular. The 

 diameter of the test is fairly uniform throughout, but occasional specimens exhibit a 

 tendency to form a bulbous swelling at about mid-length. The proloculum is not swollen, 

 the initial end of the tube and sometimes both ends being closed with a " stopper" of 

 material similar to that used for the walls. Colour dark grey-brown. Length unknown, 

 the largest fragment 6 mm. 



A good many fragments, but no perfect specimens, were found at WS 88. The 

 organism is distinctive and its exact relationships are rather puzzling. The bulbous 

 swelling in the tube would suggest Rhabdammina linearis, Brady, but the closed end of 

 the tube forbids its inclusion in that genus. On the other hand it has few points in 

 common with Hyperammina except this closed tube. The general texture of the wall and 

 the nature of the proloculum make H. elongata, Brady, its nearest relative. 



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