90 FORAMINIFERA 



dichotomously or irregularly branching second chamber; wall 

 arenaceous, usually with calcareous cement; apertures at ends 

 of the branches. 



Silurian ( ?) , Jurassic to Recent. The living species are 

 found in shallow waters of tropical and subtropical portions of 

 the Pacific. 



Genus PSAMMATODENDRON Norman, 1881 



Plate 7, figrures 1, 2 

 Genoholotype, Psammatodendron arboreseens Norman 



Psamtnatode/ndron Norman, in H. B. Brady, Denkschr. K. Akad. Wiss. 



Wien, vol. 43, 1881, p. 98. 

 Hyperammina (part) H. B. Brady, Rep. Voy. Challenger, Zool., vol. 9, 



1884, p. 262. 



Test attached, consisting of a bulbous proloculum with a long 

 tubular, dichotomously branched second chamber, of even diam- 

 eter throughout; wall arenaceous with a thin chitinous lining 

 and ferruginous cement; apertures formed by the open ends of 

 the tubes. 



Recent. Records are mostly from the North Temperate and 

 Arctic regions but a few are from warmer waters. 



Genus SYRINGAMMINA H. B. Brady, 1883 

 Plate 7, figures 4-6 



Genoholotype, Syringammina fragillissima H. B. Brady 

 Syringammina H. B. Brady, Proc. Roy. Soc. London, vol. 35, 1883, p. 155. 



Test free or adherent, consisting of a bulbous base and many 

 branching arms or of masses of anastomosing tubes in a rounded 

 mass; wall of fine arenaceous particles with a small amount of 

 cement; apertures at the ends of the tubular portions. 



Recent. Faroe Channel, off the Azores and the Antarctic. 



A detailed account of the type species is given by Brady in 

 the Challenger Report, vol. 9, 1884, p. 243. 



