334 FORAMINIFERA 



careous, the surface solid with large scattered foramina covered 

 by a finely perforated plate; color dark red. 

 Recent. 



Genus SPORADOTREMA Hickson, 1911 

 Plate 52, figures 28-30 



Genoholotype, Polytrema cylindricwm Carter 

 Sporadotrema HiCKSON, Trans. Linn. Soc. Zool., vol. 14, 1911, p. 447. 

 Polytrema Carter, 1880 (not Risso). 



Test attached, the early stages coiled, later extending outward 

 and upward into short stout branches, numerous chambers ap- 

 parent about the outer end; wall calcareous, the surface solid 

 with scattered foramina, open, not covered by a plate; color 

 orange or red. 



Recent. 



Genus POLYTREMA Risso, 1826 



Plate 52, figures 21-24 



Genoholotype, Polytre^na corallina Rissoz= Millepora miniacea Pallas 

 Polytrema Risso, Hist. Nat. Europe Merid., vol. 5, 1826, p. 340. 

 Millepora (part) of authors. 



Pustularia Gray, Proc. Zool. Soc. London, vol. 26, 1858, p. 271 (genoholo- 

 type, Pustularia rosea Gray). 



Test attached, in the early stages coiled, later with the small 

 chambers piled up in an irregular branching mass with slender 

 projections; wall calcareous, perforate, the surface finely per- 

 forate with larger open foramina; color light red. 



Late Tertiary and Recent. 



This family has been derived from the attached trochoid forms 

 such as Cibicides, and has become highly specialized. A very 

 striking color is developed in the different genera, more pro- 

 nounced than seen elsewhere except in a few scattered species of 

 other families. For details of structure of the various genera, 

 the reader is referred to the excellent paper of Hickson — On 

 Polytrema and Some Allied Genera (Trans. Linn. Soc. London, 

 Zoology, vol. 14, No. 20, 1911). 



