112 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



radiate, central portion of the test often transparent, showing the 

 earlier coils; apertural end projecting, truncate; aperture radiate, 

 sometimes with an elongate elliptical opening at the top of the 

 somewhat truncated apertural face. 



Diameter up to 2.25 mm. 



Distt^ihution.— Ty pa-specimen (U.S.N.M. Cat. No. 18993) from 

 Albatross station D2544, in 181 fathoms (240 meters), off the south- 

 eastern coast of the United States. There are numei'ous specimens of 

 this form, ranging from the latitude of Cape Cod southward, and 

 into the Gulf of Mexico. Flint's specimens are also from this same 

 general region. Brady records this species as Cristellaria articulata 

 Eeuss, but a reference to the original figures of Reuss will show that 

 the two are not identical. Brady mentions that fine examples of C. 

 articulata occur in the dredged sands from off Culebra Island, 390 

 fathoms (713 meters), and it is to be suspected that his figured speci- 

 mens came from this station. Pie also figures (pi. 69, figs. 1^) what 

 he called wild-growing forms which came from off Nightingale 

 Island, Tristan da Cunha, 100-150 fathoms (183-274 meters). Al- 

 tliough specimens from both these localities were referred to the same 

 species by Brady, a reference to the plates will show how different 

 are the two forms. Our species has a very different form, a very 

 jjeculiar apertural region, and is very constant in the character of 

 the chambers, the sutures, and the general form. In the Summary 

 of Results of the Challenger Expedition, the species is also recorded 

 from off Bermuda and at other stations from Spain to the Canaiy 

 Islands, and in the southern Atlantic, but from a study of western 

 Atlantic species and their distributions it is probable that there is 

 distributed in the warmer portion of the western Atlantic a distinct 

 species to which I have here given a definite name. Its affinities are 

 to be looked for rather in the Indo-Pacific. 



