16 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



ornamented by two distinct longitudinal ridges, rounded or sharp, 

 connected between with transverse ridges, coinciding partially with 

 the chambers, leaving the whole surface broken into series of irregu- 

 lar depressions, coarsely perforate; aperture elongate. 



This species, recently described from the Miocene of the Choctaw- 

 hatchee marl of Florida, occurs also living in the West Indian 

 region, and specimens occur as far south as the Falklands, including 

 Rio de Janeiro Harbor and the coast of Argentina. 



Heron-Allen and Earland have given a new name to a closely 

 related form that occurs off the coast of Europe. Both of these 

 species have been for a long time classed with d'Orbigny's B. plicata^ 

 w^hich is a very different species occurring off the western coasts of 

 North and South America. 



BOLIVINA STRIATULA Gushman 

 PiuATB 3, FrouREs 21 a, h 



BoUvina striaUila Cushman, U. S. Nat. Mus. Bull. 104, pt. 3, p. 43, 1922. 



Like many others of the typical West Indian species, this one 

 occurs in considerable numbers at all three stations in Rio de Janeiro 

 Harbor, but nowhere else in the collections to the southward. Speci- 

 mens are well developed and typical. 



BOLIVINA TORTUOSA H. B. Brady 



Plate 3, Figukes 22 a, 6 



BoUvina tortuosa Cushman, U. S. Nat. Mus. Bull. 104, pt. 3, p. 49, 1922. 



There are two specimens of this species from one of the stations in 

 Rio de Janeiro Harbor. Neither of these is apparently an adult 

 specimen, but they resemble the Atlantic form of the species much 

 more than the Pacific one. 



BOLIVINA sp.(?) 



Plate 3, Figures 2S a, b 



The figured specimen shows a peculiar small species, which oc- 

 curred rarely in the material from Rio de Janeiro Harbor, and with- 

 out a larger series it can not be definitely assigned a specific name. 



Genus LOXOSTOMUM Ehrenberg, 1854 



LOXOSTOMUM MAYORI (Cushman) 



Plate 3, Figure 24 



Bolipina mayori Cushman, U. S. Nat. Mus. Bull. 104, pt. 3, p. 40, 1922. 



Very excellent and typical specimens of this species occur in con- 

 siderable numbers in the collection from Rio de Janeiro Harbor. 



