48 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



ELPHIDIUM CRATICULATUM (Fichtel and Moll) 



Plate 11, Figures 5a, b 



Nautilus craliculatus Fichtel and Moll, Test. Micr., p. 51, pi. 5, figs, h-k, 1803. 



Polystomella craticulata d'Orbigny, Ann. Sci. Nat., vol. 7, p. 284, no. 3, 1826. — 

 Carpenter, Intr. Foram., p. 279, pi. 16, figs. 1, 2, 1862.— H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, p. 739, pi. 110, figs. 16, 17, 1884.— 

 Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. ii, vol. 18, p. 433, pi. 20, 

 figs. 24, 25, 1893.— Millett, Journ. Roy. Micr. Soc, 1904, p. 604.— Cush- 

 MAN, U. S. Nat. Mus. Bull. 71, pt. 4, p. 34, pi. 19, fig. 4, 1914. 



Test subglobose, composed of as many as 50 chambers in the last- 

 formed coil; in face view broadly lenticular, about one and one-half 

 times as long as wide, periphery bluntly rounded; umbilical region 

 umbonate, filled with clear shell material for one-third or more of the 

 diameter of the test, with large pores, rest of surface reticulate; 

 aperture a long narrow opening subdivided into a number of pores. 



This species, which is a typical shallow-water one of the Indo- 

 Pacific, has turned out to be extremely rare in oar collections. The 

 only specimens are from Vavau Anchorage, Tonga Islands, and in 

 12 fathoms off Nairai, Fiji. At neither of these localities were the 

 specimens at all well developed. 



ELPHIDIUM JENSENI (Cushman) 



Plate 11, Figures 6, 7 



Polystomella macella (Fichtel and Moll) var. Jensen, Proc. Linn. Soc. New 



South Wales, vol. 29, p. 817, pi. 23, fig. 4, 1904(1905). 

 Polystomella jenseni Cushman, Carnegie Inst. Washington Publ. 342, p. 49, pi. 16, 



figs. 4(?), 6, 1924. 



Test very strongly compressed, periphery very slightly keeled; 

 chambers numerous, distinct, not inflated; sutures distinct, somewhat 

 raised, retral processes elongate, thin, bridging almost entirely the 

 area between the sutures with flat depressed areas between, umbilical 

 area finel}^ papillate. Length, up to 0.6 mm; breadth, 0.45 mm; 

 thickness, 0.1 mm. 



Jensen originally described this species from off Australia in 100 

 fathoms. It occurs also in considerable numbers off Samoa, and in 

 our present collections has proved to be fairly common, occurring at 

 the following shallow-water stations: Vavau Anchorage, Tonga 

 Islands, 18 fathoms; Mokaujar Anchorage, Fiji; Levuka, Fiji, 12 

 fathoms; Nairai, Fiji, 12 fathoms; Rongelap Atoll, Marshall Islands; 

 and 21 fathoms, Guam Anchorage, Ladrone Islands. At some of 

 these stations it was fairly common. It is very rare in the few 

 Albatross stations given in Table 27, most of which specimens are 

 probably ones carried out from shoal water, and were not living at the 

 depth from which they were obtained. 



