NO. 4 FORAMINIFERA CUSHMAN 47 



Genus BACULOGYPSINA Sacco (1893) (Tinoporus of Authors) 

 f'late 12, fig. 5 



Test in the very young, rotaliform, later irregular, with numerous 

 small finely punctate chambers, with four to eight or even more sharp 

 tapering spines ; supplementary skeleton greatly developed, at the 

 surface, when well preserved, with bosses of clear shell material united 

 with surrounding ones by radial connecting portions of the same 

 sort of material, making a reticulate marking standing out slightly 

 above the surface. 



Genus GYPSINA Carter, 1877 



Plate 13, fig. I 



Test free or adherent, when free it may be spherical or compressed, 

 when adherent the test takes the form of the object to which it is 

 attached or becomes a raised mass of chambers more or less sym- 

 metrical ; early chambers forming a flat spire in the higher species, 

 but in most irregularly arranged throughout ; wall coarsely porous. 



Genus POLYTREMA, Risso, 1826 



Test adherent ; early chambers small, spirally arranged, soon 

 covered by the irregular loosely growing chambers making an irregu- 

 lar spreading mass, later chambers forming an arborescent growth ; 

 wall calcareous, areolated, numerous apertures appearing at the sur- 

 face on papill?e ; interior often of loosely arranged chambers with 

 lacunae between ; color red or pink or sometimes white. 



Genus HOMOTREMA Hickson, 1911 



The surface is marked by clearly defined areolae about o.i mm. in 

 diameter, perforated by a large number of small foramina, o.ool mm. 

 in diameter. The boundaries of the areolae are solid, and there are 

 no pillar pores. Below the surface there may be seen a number of 

 chambers communicating with one another by large open passages and 

 bounded by solid walls. There are no hollow pillars and no foramina 

 except those on the outer walls of the superficial chambers. 



Genus SPORADOTREMA Hickson, 191 1 



The surface of the stem, and, in many cases, of the proximal parts 

 of the branches as well, are not marked by areolae at all. The 

 foramina are scattered irregularly on the surface and are of relatively 

 large size. There are no pillar pores. Below the surface there may 

 be seen a number of chambers communicating with one another by 



