30 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



This species was described from Albatross station H3833, one of the 

 samples belonging in the present lot of material. The species is 

 probably to be expected only in deeper water samples. The other 

 two records in the above synonymy are from off the Falklands and 

 from the North Atlantic. 



The specimens exhibit considerable variation in size, thickness, 

 lobulation of the periphery, number of chambers, relative prominence 

 of umbilical plug, degree to which an infolding of the wall extends 

 into the apertural face, and smoothness and transparency of the wall. 



The chief distinguishing characteristics of the species seem to be 

 presence of the umbilical stud of solid shell material, the position of 

 the apertural opening (not extending into the apertural face parallel 

 with the periphery as in Epistominella) , and usually the appearance 

 of a crimped or crinkled periphery, resulting from the concentration 

 of coarse pores or tubules along the periphery. 



Number of chambers per final whorl is usually 6 but may be as 

 high as 9. The apertural opening is not clearly visible on the holo- 

 type. Another specimen, therefore, is illustrated, showing that the 

 aperture is located beneath a narrow lip and that it extends part way 

 along the base of the apertural face but not into the apertural face. 

 A groove or infolding of the apertural face parallel with, and just 

 ventral to, the periphery tends to give the impression of an 

 Epistominella-tyipe of aperture, especially in specimens where the 

 aperture is obscured by sediment. 



NUTTALLIDES? RUGOSUS (Phleger and Parker) 



Plate 11, Figure 2 



Pseudoparrella (?) rugosa Phleger and Parker, 1951, Geol. Soc. Amer. Mem. 



46, pt. 2, p. 28, pi. 15, figs. 8, 9. 

 Epistominella rugosa (Phleger and Parker). — Parker, 1954, Bull. Mus. Comp. 



Zool., vol. Ill, no. 10, p. 533, pi. 10, figs. 24, 25. 



Single specimens were found in four samples from deep water. 

 The species is distinctive in its finely rugose surface, the slight forward 

 indentation of the wall above the aperture just inside the periphery, 

 and in the fact that the ventral sutures fail to meet owing to the pres- 

 ence of a small umbilical plug of solid shell material. 



Genus EPISTOMINELLA Husezima and Maruhasi, 1944 



EPISTOMINELLA EXIGUA (Brady) 



Plate 10, Figure 1 



Pulvinulina exigua Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 9, p. 696, 



pi. 103, figs. 13, 14. 

 Pseudoparrella exigua (H. B. Brady).' — Phleger and Parker (part), 1951, Geol. 



Soc. Amer. Mem. 46, pt. 2, p. 28, pi. 15, fig. 6 (not fig. 7). 



