ART. 3 SOUTH AMERICAN FORAMINIFEEA — CUSHMAN AND PARKER 1 1 



however, in its general form and in the heav3^ somewhat costate, 

 appearance of the early part of the last-formed coil. So far as the 

 examination of West Indian material shows, this species is never an 

 abundant one, but is nevertheless widely distributed in this warmer 

 area of the western Atlantic. 



ELPHroiUM LESSONII (d'Orbigny) 



Elvhidium lessonii Cushman, U. S. Nat. Mus. Bull. 104, pt. 7, p. 22, 1930. 



This is one of the finest species of the genus, very abundant and 

 well developed in the general region of the Falklands, occurring at 

 Port William, Port Stanley, and Port Howard. There are also typi- 

 cal specimens from Puerto Deseado, Argentina. D'Orbigny's original 

 type locality is given as the " coast of Patagonia, to the south of Rio 

 Negro." His type specimen was not apparently a completely adult 

 form, but represents a young stage frequently seen with the others in 

 our collections. In the adult form this is a very beautifully sculp- 

 tured species and can hardly be confused with any other one of the 

 genus. So far as is known it is limited to the general region of the 

 Falklands and southern South America. It may be noted that 

 Brady's figure in the Challenger report (pi. 110, fig. 9) is probably 

 this species. This particular figured specimen was from the Falk- 

 lands. 



ELPHIDIUM OWENIANUM (d'Orbigny) 



Elphidium owenianum Cushman, U. S. Nat. Mus. Bull. 104, pt. 7, p. 21, 1930. 



D'Orbigny described this species from off the " coast of Patagonia, 

 to the south of Rio Negro." It may be distinguished from the 

 others of the region by the thickening of the umbilical region, very 

 distinct sutures, and the subacute margin. We have specimens from 

 the Falklands at Port Howard and Port William, and it also occurs 

 off Puerto Deseado, Argentina. It is not nearly so common as the 

 preceding species. 



ELPHmiUM cf. ADVENUM (Cushman) 



Elphidium cf. advenum Cushman, U. S. Nat. Mus. Bull. 104, pt. 7, p. 25, 1930. 



The only specimens that can be referred to tliis species occur in 

 the warm water of Rio de Janeiro Harbor. This species is typically 

 a warm- water one of the West Indies and occurs also as far back as 

 the Miocene of the Florida region. Some of the specimens of the 

 following species somewhat resemble this, but the umbonal portion 

 of E. advenum is very distinct, with a definite boss in its typical 

 form, whereas the central region of E. alvarezianum is excavated and 

 without any central boss. 



