144 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Genus POLYTREMA Risso, 1826 



Pohjlrcmn Ri.sso, Hist. Nat. Europe MericL, vol. 5, 1826, p. 340. — Cushm.\n, 

 Special Pvibl. No. 1, Cushman LaVx Forain. Res., 1928, p. 334. 



Millepora (part) of Authors. 



Pustularia Gray, Proc. Zool. Soc. London, vo'. 26, 1858, ]). 271 (genoholo- 

 type, Pustularia rosea Gray). 



Genoholotype . — Polytrema corallina 'Risso = Mill ejjor a miniacea 

 Pallas. 



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

 chambers piled up in an irregular branching mass with slender pro- 

 jections; w^all calcareous, perforate, the surface finely perforate with 

 larger open foramina; color light red. 



Late Tertiary and Recent. 



Although Polytrema has been recorded from the Atlantic, it is 

 probable that most, if not all, the records are Homotrema, at least as 

 far as the West Indian region is concerned. 



