16 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Rhabdammina abyssorum — material examined. 



RHABDAMMINA ABYSSORUM W. B. Carpenter, var. RADIATA Cushman. 



Rhabdammina abyssorum W. B. Carpenter, var. radiata Cushman, Proc. U. vS. 

 Nat. Mus., vol. 51, 1917, p. 652. 



Description. — Test with a globular central cliamber from which 

 radiate numerous arms with annular constrictions, largest diameter 

 of the arms near the central chamber, thence tapering toward the 

 outer end; wall of fine texture, smoother than the typical, reddish 

 brown in coloi\ 



Distjn.hution. — Although comparatively rare in the Atlantic, speci- 

 mens of this variety were found in material from two AJhatj'oss 

 stations, D2383, 1,181 fathoms, bottom temperature 39.8° F., and 

 D2385, 730 fathoms, bottom temperature 40.1° F. These stations 

 are both in the northern part of the Gulf of Mexico. 



The types were described from Albatross station D5654 in 805 

 fathoms from the Gulf of Boni. In the deep water of the East 

 Indian region of the Pacific this variety is met with in considerable 

 numbers, replacing the typical form but in the Atlanlic it is apparently 

 rare. 



