128 . THE FOEAMINIFERA 



found adherent to shells, Halimeda joints, and even 

 Foraminifera, as Gycloclypeus. Since its occurrence 

 in the ' Challenger ' gatherings from the Admiralty 

 and Friendly Islands Sagenina has been found in con- 

 siderable abundance around the atoU of Funafuti, 

 where it flourishes both inside the lagoon and on the 

 outer reef. Becent. (Plate 6, fig. L.) 



Genus Botellina, Carpenter. 



Test subcyhndrical, probably growing attached at 

 one end ; the other end rounded, and formed of loose 

 sand-grains with interstitial openings. Interior filled 

 with irregular septa, formed of coarse sand-grains 

 slightly cemented together. Becent. 



Example. — B. lab/jrinthica, Brady, ' Quart. Journ. 

 Micr. Sci.' vol. xxi N.S. 1881, p. 48 ; ' Eep. " Chall." ' 

 vol. ix. p. '279, pi. xxix. figs. 8-18. 



This species is peculiar among the AsTRORmzicE 

 in having a labyrinthic structure in the interior of 

 the test. It is a singular fact that B. lah/jriiithica, 

 the only representative of the genus by the way, 

 has only occurred once, in dredgings made by the 

 ' Porcupine ' in the Faroe Channel, at 440 fathoms. 

 Becent (Plate 6, fig. M.) 



Genus HaJiplujsema, Bowerbank. 



Test columnar, growing attached by an expanded, 

 convex, pseudo-polythalamous base ; column straight 

 or crooked, either simple and gradually increasing in 

 size towards the apex or dividing into a number of 



