FAMILY 7. AMMODISCIDAE 103 



Carboniferous to Recent. The recent forms are in cool or 

 deep waters. Specimens are abundant in some of the Pennsyl- 

 vanian formations. 



Genus PSAMMONYX Doderlein, 1892 

 Plate 9, figures 26, 27 



Genoholotype, Psammonyx vulcanicus Doderlein 

 PsaniTnonyx Doderlein, Verb. Deutsch. Zool. Ges., 1892, p. 145. 



Test free, consisting of a proloculum and an undivided second 

 chamber, loosely coiled in the early stages, later uncoiled, com- 

 pressed and increasing in height toward the open end; wall of 

 fine sand grains ; aperture large, formed by the open end of the 

 test. 



Recent. Off Japan, 185-370 meters. 



As in many other foraminifera, the microspheric form has 

 the early stages most nearly complete while the megalospheric 

 form may start the test uncoiled. 



Subfamily 2. Tolypammininae 

 Test attached 



Genus TOLYPAMMINA Rhumbler, 1895 



Plate 9, figure 16 

 Genoholotype, Hyperammina vagans H. B. Brady 



Tolypammina Rhumbler, Nachr. Kongl. Ges. Wiss. Gottingen, 1895, 



p. 83. 

 Hyperammina (part) H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 



1879, p. 33. 

 Serpulella EiMER and FiCKERT, Zeitschr. Wiss. Zool., vol. 65, 1899, p. 674 



(Genoholotype, Hyperamm,ina vagans H. B. Brady). 

 A^nmonema, 1. c, p. 685 (Genoholotype, Serpula filitim Schmid). 

 Girvanella (part) of authors (not Girvanella Nicholson and Etheridge, 



1878). 



Test, in the young stages at least, adherent, but becoming 

 free, consisting of an elongate oval proloculum and long un- 

 divided tubular second chamber, unbranched, the earliest por- 

 tion sometimes coiled; wall arenaceous with a large proportion 

 of yellowish- or reddish-brown cement; aperture formed by 

 the open end of the tube. 



