FAMILY 4. SACCAMMINIDAE 73 



grains firmly cemented; aperture single, often with a slight 

 neck. 



Carboniferous to Recent. Typically in rather cold water. 



There seems to be a distinct selection of sand grains, often 

 garnet grains or other special sorts being used to the exclusion 

 of others. 



Genus PROTEONINA Williamson, 1858 



Plate 4, figures 6-8 

 Genotype, by designation, Proteonina fusiformis Williamson 



Proteonina WILLIAMSON, Rec. Foram. Great Britain, 1858, p. 1. 



Reophax (part) of authors. 



Difflugia Egger, Abhandl. Kon. bay. Akad. Wiss. Miinchen, vol. 18, 1895, 



p. 251 (not Difflugia Leclerc, 1815). 

 Saccanimina (part) EiMER and Fickert, Zeitschr. Wiss. Zool., vol. 65, 



1899, p. 671. 



Test free, a fusiform or flask-shaped undivided chamber ; wall 

 of coarse sand grains, mica flakes, or other agglutinated mate- 

 rial with a thin inner layer of chitin ; aperture usually circular, 

 often with a slight neck which may become elongate. 



Carboniferous ( ?) , Jurassic to Recent. Widely distributed 

 mainly in cold or deep waters. 



The species show a considerable amount of selectivity in the 

 material used. 



Genus LAGENAMMINA Rhumbler, 1911 

 Plate 4, figure 9 



Genoholotype, Lagenammina laguncula Rhumbler 

 Lagenammina Rhumbler, Foram. Plankton-Exped., pt. 1, 1911, p. 92. 



Test free, bottle-shaped, with a distinct pseudochitinous sub- 

 stratum on which are foreign bodies usually covering the under 

 layer ; aperture circular, at the end of an elongate neck. 



Recent. From the North Atlantic 1524 to 2400 meters. 



This genus differs from Proteonina in the much more distinct 

 interior chitinous layer. 



