18 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 8Q 



Family ROTALIIDAE 

 Genus SPIRILLINA Ehrenberg, 1841 



SPIRILLINA VIVIPARA Ehrenberg var. DENSEPUNCTATA Cushman 



Plate 4, Figukes 1 a-c 



Spirillina vivipara var. densepunctata Cushman, U. S. Nat. Mus. Bull. 104, pt. 

 8, pp. 4, 5, 1931. 



Figures are given of this somewhat trochoid form recently de- 

 scribed from Porto Rico. The few specimens in our material came 

 from the stations in Rio de Janeiro Harbor, showing that this variety 

 is probably to be found throughout the general West Indian area. 

 The perforations are usually numerous and closely placed, and in 

 spite of being a planispiral form, there is a tendency for it to become 

 trochoid. 



Genus PATELLINA Williamson, 1858 



PATELLINA CORRUGATA WiUiamson 

 Plate 4, Figuee 2 



Patellina corrugata Cushman, U. S. Nat. Mus. Bull. 104, pt. 8, pp. 11, 12, 1931. 



Specimens that seem to be identical with those described by Wil- 

 liamson and others from off Great Britain occur in the material from 

 Port William, Falklands. They have, as is shown in the figure, a low 

 spire and coarse divisions of the chambers. They do not occur in the 

 warmer water to the northward. 



PATELLINA ADVENA Cushman 

 Plate 4, Figitbe 3 



Patellina advena Cushman, U. S. Nat. Mus. Bull. 104, pt. 8, p. 13, 1931. 



Typical specimens with the very finely divided chambers and rather 

 high spire occur in two of the lots of material from Rio de Janeiro 

 Harbor. The appearance of these two species under the microscope 

 is very distinct, and their distribution is apparently equally distinc- 

 tive, P. advena being a warmer water species, while P. corrugata is 

 laiown only from cold waters. 



Genus DISCORBIS Lamarck, 1804 



DISCORBIS FLORmANA Cushman 



Plate 4, Figures 5 Or-c 



Discorbis floridana Cushman, U. S. Nat. Mus. Bull. 104, pt. 8, pp. 21, 22, 1931. 



A few specimens, which seem to be identical with this species, 



occur at the various stations in Rio de Janeiro Harbor. One of the 



