12 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



ELPHIDIUM ALVAREZIANUM (d'Orbigny) 



Elphidium alvaresianum, Cushman, U. S. Nat. Mus. Bull. 104, pt. 7, p. 18, 1930. 

 This is one of the distinctive species of the Falklands and southern 

 South America, recorded from both regions by d'Orbigny in his 

 original description. Besides the typical form the following variety 

 occurs in the region of the Falklands: 



ELPHIDIUM ALVAREZIANUM (d'Orbigny) SERRULATUM, new variety 



Pr^TB 2, Figures i) a, h 



Variety differing from the typical in the character of the periphery, 

 which has definite toothlike projections, in the extreme form having 

 each projection opposite the chambers divided into numerous serra- 

 tions. Specimens connecting this variety with the typical form occur 

 in which the spinose projections are simple. 



Holotype of variety (U.S.N.M. No. 21932) from station 97, Port 

 William, Falkland Islands, collected by Dr. Waldo L. Schmitt. 



In its fully developed form this is a very beautiful variety and 

 unlike any other form known to us. It is, however, very definitely 

 related to d'Orbigny's species. 



ELPHroiUM AUSTRALIS, new species 



Plate 2, Figures 8 a, V 



Test planispiral, nearly completely involute, the periphery very 

 broadly rounded, and in the last- formed portion almost truncate; 

 chambers very distinct, 12 to 15 in the last-formed coil, of nearly uni- 

 form shape and increasing only slightly in size as added; sutures 

 deep, very distinct; retral processes very short and often incon- 

 spicuous; wall of the main bod}^ of the chamber smooth except in the 

 early portion of the last-formed coil, where it is often roughened by 

 small papillae arranged more or less in longitudinal lines in the plane 

 of coiling, unbonal region also strongly papillate; aperture consisting 

 of numerous small circular pores at the base of the apertural face, 

 which is smooth, with a distinct border about its periphery. Diameter, 

 0.5-0.6 mm. ; thickness, 0.25 mm. 



Holotype (U.S.N.M. No. 21933) from station 80, Port Stanley, 

 Falkland Islands, collected by Dr. Waldo L. Schmitt. 



This species was common at the type station but did not occur at 

 any of the other stations in the entire collection. It is a very distinct 

 and unmistakable species and apparently of very limited distribution. 



